2026
|
Jana, Dipankar; Mukherjee, Shubhrasish; Litvinov, Dmitrii; Grzeszczyk, Magdalena; Grebenchuk, Sergey; Siskins, Makars; Gavriliuc, Virgil; Ouyang, Yihang; Chen, Changyi; Ye, Yuxuan; Yiming, Meng; Koperski, Maciej Two-Dimensional Materials as a Multiproperty Sensing Platform ADVANCED FUNCTIONAL MATERIALS, 36 (14), 2026, DOI: 10.1002/adfm.202516728. Abstract | BibTeX | Endnote @article{WOS:001619984500001,
title = {Two-Dimensional Materials as a Multiproperty Sensing Platform},
author = {Dipankar Jana and Shubhrasish Mukherjee and Dmitrii Litvinov and Magdalena Grzeszczyk and Sergey Grebenchuk and Makars Siskins and Virgil Gavriliuc and Yihang Ouyang and Changyi Chen and Yuxuan Ye and Meng Yiming and Maciej Koperski},
doi = {10.1002/adfm.202516728},
times_cited = {3},
issn = {1616-301X},
year = {2026},
date = {2026-02-01},
journal = {ADVANCED FUNCTIONAL MATERIALS},
volume = {36},
number = {14},
publisher = {WILEY-V C H VERLAG GMBH},
address = {POSTFACH 101161, 69451 WEINHEIM, GERMANY},
abstract = {Two-dimensional (2D) materials have disrupted materials science due to
the development of van der Waals technology. It enables the stacking of
ultrathin layers of materials characterized by vastly different
electronic structures to create man-made heterostructures and devices
with rationally tailored properties, circumventing limitations of
matching crystal structures, lattice constants, and geometry of
constituent materials and supporting substrates. 2D materials exhibit
extraordinary mechanical flexibility, strong light-matter interactions
driven by their excitonic response, single photon emission from atomic
centers, stable ferromagnetism in sub-nm thin films, fractional quantum
Hall effect in high-quality devices, and chemoselectivity at ultrahigh
surface-to-volume ratio. Consequently, van der Waals heterostructures
with atomically flat interfaces demonstrate an unprecedented degree of
intertwined mechanical, chemical, optoelectronic, and magnetic
properties. This constitutes a foundation for multiproperty sensing,
based on complex intra- and intermaterial interactions, and a robust
response to external stimuli originating from the environment. Here,
recent progress are reviewed in the development of sensing applications
with 2D materials, highlighting the areas where van der Waals
heterostructures offer the highest sensitivity, simultaneous responses
to multiple distinct externalities due to their atomic thickness in
conjunction with unique material combinations, and conceptually new
sensing methodology.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Two-dimensional (2D) materials have disrupted materials science due to
the development of van der Waals technology. It enables the stacking of
ultrathin layers of materials characterized by vastly different
electronic structures to create man-made heterostructures and devices
with rationally tailored properties, circumventing limitations of
matching crystal structures, lattice constants, and geometry of
constituent materials and supporting substrates. 2D materials exhibit
extraordinary mechanical flexibility, strong light-matter interactions
driven by their excitonic response, single photon emission from atomic
centers, stable ferromagnetism in sub-nm thin films, fractional quantum
Hall effect in high-quality devices, and chemoselectivity at ultrahigh
surface-to-volume ratio. Consequently, van der Waals heterostructures
with atomically flat interfaces demonstrate an unprecedented degree of
intertwined mechanical, chemical, optoelectronic, and magnetic
properties. This constitutes a foundation for multiproperty sensing,
based on complex intra- and intermaterial interactions, and a robust
response to external stimuli originating from the environment. Here,
recent progress are reviewed in the development of sensing applications
with 2D materials, highlighting the areas where van der Waals
heterostructures offer the highest sensitivity, simultaneous responses
to multiple distinct externalities due to their atomic thickness in
conjunction with unique material combinations, and conceptually new
sensing methodology. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFDipankar Jana
Shubhrasish Mukherjee
Dmitrii Litvinov
Magdalena Grzeszczyk
Sergey Grebenchuk
Makars Siskins
Virgil Gavriliuc
Yihang Ouyang
Changyi Chen
Yuxuan Ye
Meng Yiming
Maciej Koperski
- TITwo-Dimensional Materials as a Multiproperty Sensing Platform
- SOADVANCED FUNCTIONAL MATERIALS
- DTArticle
- ABTwo-dimensional (2D) materials have disrupted materials science due to
the development of van der Waals technology. It enables the stacking of
ultrathin layers of materials characterized by vastly different
electronic structures to create man-made heterostructures and devices
with rationally tailored properties, circumventing limitations of
matching crystal structures, lattice constants, and geometry of
constituent materials and supporting substrates. 2D materials exhibit
extraordinary mechanical flexibility, strong light-matter interactions
driven by their excitonic response, single photon emission from atomic
centers, stable ferromagnetism in sub-nm thin films, fractional quantum
Hall effect in high-quality devices, and chemoselectivity at ultrahigh
surface-to-volume ratio. Consequently, van der Waals heterostructures
with atomically flat interfaces demonstrate an unprecedented degree of
intertwined mechanical, chemical, optoelectronic, and magnetic
properties. This constitutes a foundation for multiproperty sensing,
based on complex intra- and intermaterial interactions, and a robust
response to external stimuli originating from the environment. Here,
recent progress are reviewed in the development of sensing applications
with 2D materials, highlighting the areas where van der Waals
heterostructures offer the highest sensitivity, simultaneous responses
to multiple distinct externalities due to their atomic thickness in
conjunction with unique material combinations, and conceptually new
sensing methodology. - Z93
- PUWILEY-V C H VERLAG GMBH
- PAPOSTFACH 101161, 69451 WEINHEIM, GERMANY
- SN1616-301X
- VL36
- DI10.1002/adfm.202516728
- UTWOS:001619984500001
- ER
- EF
|
Olkowska-Pucko, Katarzyna; Wozniak, Tomasz; Blundo, Elena; Zawadzka, Natalia; Kipczak, Lucja; Junior, Paulo Faria E; Szpakowski, Jan; Krasucki, Grzegorz; Cianci, Salvatore; Vaclavkova, Diana; Jana, Dipankar; Kapuscinski, Piotr; Pawbake, Amit; Badola, Shalini; Grzeszczyk, Magdalena; Cecchetti, Daniele; Pettinari, Giorgio; Antoniazzi, Igor; Sofer, Zdenek; Plutnarova, Iva; Watanabe, Kenji; Taniguchi, Takashi; Faugeras, Clement; Potemski, Marek; Babinski, Adam; Polimeni, Antonio; Molas, Maciej R Extremely High Excitonic g Factors in 2D Crystals by Alloy-Induced
Admixing of Band States PHYSICAL REVIEW LETTERS, 136 (7), 2026, DOI: 10.1103/lx4n-7bb7. Abstract | BibTeX | Endnote @article{WOS:001699128100002,
title = {Extremely High Excitonic g Factors in 2D Crystals by Alloy-Induced
Admixing of Band States},
author = {Katarzyna Olkowska-Pucko and Tomasz Wozniak and Elena Blundo and Natalia Zawadzka and Lucja Kipczak and Paulo E Faria Junior and Jan Szpakowski and Grzegorz Krasucki and Salvatore Cianci and Diana Vaclavkova and Dipankar Jana and Piotr Kapuscinski and Amit Pawbake and Shalini Badola and Magdalena Grzeszczyk and Daniele Cecchetti and Giorgio Pettinari and Igor Antoniazzi and Zdenek Sofer and Iva Plutnarova and Kenji Watanabe and Takashi Taniguchi and Clement Faugeras and Marek Potemski and Adam Babinski and Antonio Polimeni and Maciej R Molas},
doi = {10.1103/lx4n-7bb7},
times_cited = {1},
issn = {0031-9007},
year = {2026},
date = {2026-02-01},
journal = {PHYSICAL REVIEW LETTERS},
volume = {136},
number = {7},
publisher = {AMER PHYSICAL SOC},
address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
abstract = {Monolayers (MLs) of semiconducting transition metal dichalcogenides emit
light very efficiently and display rich spin-valley physics, with
gyromagnetic (g) factors of about-4. Here, we investigate how these
properties can be tailored by alloying. Magneto-optical spectroscopy is
used to reveal the peculiar properties of excitonic complexes in
MoxW1-xSe2 MLs with different metal concentrations. We show that the
alloys feature extremely high g factors for neutral excitons, that
change gradually with the composition up to reaching values of the order
of-10 for x approximate to 0.2. First-principles calculations
quantitatively identify the alloy-induced mixing between different
conduction band valleys as the underlying mechanism originating the
anomalous composition dependence of the neutral exciton g factor. The
theoretical framework also suggests a high strain sensitivity of the
alloys, making them promising candidates for tailor-made optoelectronic
devices.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Monolayers (MLs) of semiconducting transition metal dichalcogenides emit
light very efficiently and display rich spin-valley physics, with
gyromagnetic (g) factors of about-4. Here, we investigate how these
properties can be tailored by alloying. Magneto-optical spectroscopy is
used to reveal the peculiar properties of excitonic complexes in
MoxW1-xSe2 MLs with different metal concentrations. We show that the
alloys feature extremely high g factors for neutral excitons, that
change gradually with the composition up to reaching values of the order
of-10 for x approximate to 0.2. First-principles calculations
quantitatively identify the alloy-induced mixing between different
conduction band valleys as the underlying mechanism originating the
anomalous composition dependence of the neutral exciton g factor. The
theoretical framework also suggests a high strain sensitivity of the
alloys, making them promising candidates for tailor-made optoelectronic
devices. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFKatarzyna Olkowska-Pucko
Tomasz Wozniak
Elena Blundo
Natalia Zawadzka
Lucja Kipczak
Paulo E Faria Junior
Jan Szpakowski
Grzegorz Krasucki
Salvatore Cianci
Diana Vaclavkova
Dipankar Jana
Piotr Kapuscinski
Amit Pawbake
Shalini Badola
Magdalena Grzeszczyk
Daniele Cecchetti
Giorgio Pettinari
Igor Antoniazzi
Zdenek Sofer
Iva Plutnarova
Kenji Watanabe
Takashi Taniguchi
Clement Faugeras
Marek Potemski
Adam Babinski
Antonio Polimeni
Maciej R Molas
- TIExtremely High Excitonic g Factors in 2D Crystals by Alloy-Induced
Admixing of Band States - SOPHYSICAL REVIEW LETTERS
- DTArticle
- ABMonolayers (MLs) of semiconducting transition metal dichalcogenides emit
light very efficiently and display rich spin-valley physics, with
gyromagnetic (g) factors of about-4. Here, we investigate how these
properties can be tailored by alloying. Magneto-optical spectroscopy is
used to reveal the peculiar properties of excitonic complexes in
MoxW1-xSe2 MLs with different metal concentrations. We show that the
alloys feature extremely high g factors for neutral excitons, that
change gradually with the composition up to reaching values of the order
of-10 for x approximate to 0.2. First-principles calculations
quantitatively identify the alloy-induced mixing between different
conduction band valleys as the underlying mechanism originating the
anomalous composition dependence of the neutral exciton g factor. The
theoretical framework also suggests a high strain sensitivity of the
alloys, making them promising candidates for tailor-made optoelectronic
devices. - Z91
- PUAMER PHYSICAL SOC
- PAONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
- SN0031-9007
- VL136
- DI10.1103/lx4n-7bb7
- UTWOS:001699128100002
- ER
- EF
|
Jana, Dipankar; Acharya, Swagata; Orlita, Milan; Faugeras, Clement; Pashov, Dimitar; Schilfgaarde, Mark Van; Potemski, Marek; Koperski, Maciej Deconstruction of the Anisotropic Magnetic Interactions from
Spin-Entangled Optical Excitations in van der Waals Antiferromagnets ADVANCED SCIENCE, 13 (2), 2026, DOI: 10.1002/advs.202505834. Abstract | BibTeX | Endnote @article{WOS:001610214800001,
title = {Deconstruction of the Anisotropic Magnetic Interactions from
Spin-Entangled Optical Excitations in van der Waals Antiferromagnets},
author = {Dipankar Jana and Swagata Acharya and Milan Orlita and Clement Faugeras and Dimitar Pashov and Mark Van Schilfgaarde and Marek Potemski and Maciej Koperski},
doi = {10.1002/advs.202505834},
times_cited = {1},
year = {2026},
date = {2026-01-01},
journal = {ADVANCED SCIENCE},
volume = {13},
number = {2},
publisher = {WILEY-V C H VERLAG GMBH},
address = {POSTFACH 101161, 69451 WEINHEIM, GERMANY},
abstract = {Magneto-optical excitations in antiferromagnetic d systems can originate
from a multiplicity of light-spin and spin-spin interactions, as the
light and spin degrees of freedom can be entangled. This is exemplified
in van der Waals systems with attendant strong anisotropy between
in-plane and out-of-plane directions, such as and films studied here.
The rich interplay between the magnetic ordering and sub-bandgap optical
transitions poses a challenge to resolve the mechanisms driving
spin-entangled optical transitions, as well as the single-particle
bandgap itself. Here, a high-fidelity ab initio theory is applied to
find a realistic estimation of the bandgap by elucidating the atom- and
orbital-resolved contributions to the fundamental sub-bands. It is
further demonstrated that the spin-entangled excitations, observable as
photoluminescence and absorption resonances, originate from an on-site
spin-flip transition confined to a magnetic atom (Mn or Ni). The
evolution of the spin-flip transition in a magnetic field is used to
deduce the effective exchange coupling and anisotropy constants.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Magneto-optical excitations in antiferromagnetic d systems can originate
from a multiplicity of light-spin and spin-spin interactions, as the
light and spin degrees of freedom can be entangled. This is exemplified
in van der Waals systems with attendant strong anisotropy between
in-plane and out-of-plane directions, such as and films studied here.
The rich interplay between the magnetic ordering and sub-bandgap optical
transitions poses a challenge to resolve the mechanisms driving
spin-entangled optical transitions, as well as the single-particle
bandgap itself. Here, a high-fidelity ab initio theory is applied to
find a realistic estimation of the bandgap by elucidating the atom- and
orbital-resolved contributions to the fundamental sub-bands. It is
further demonstrated that the spin-entangled excitations, observable as
photoluminescence and absorption resonances, originate from an on-site
spin-flip transition confined to a magnetic atom (Mn or Ni). The
evolution of the spin-flip transition in a magnetic field is used to
deduce the effective exchange coupling and anisotropy constants. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFDipankar Jana
Swagata Acharya
Milan Orlita
Clement Faugeras
Dimitar Pashov
Mark Van Schilfgaarde
Marek Potemski
Maciej Koperski
- TIDeconstruction of the Anisotropic Magnetic Interactions from
Spin-Entangled Optical Excitations in van der Waals Antiferromagnets - SOADVANCED SCIENCE
- DTArticle
- ABMagneto-optical excitations in antiferromagnetic d systems can originate
from a multiplicity of light-spin and spin-spin interactions, as the
light and spin degrees of freedom can be entangled. This is exemplified
in van der Waals systems with attendant strong anisotropy between
in-plane and out-of-plane directions, such as and films studied here.
The rich interplay between the magnetic ordering and sub-bandgap optical
transitions poses a challenge to resolve the mechanisms driving
spin-entangled optical transitions, as well as the single-particle
bandgap itself. Here, a high-fidelity ab initio theory is applied to
find a realistic estimation of the bandgap by elucidating the atom- and
orbital-resolved contributions to the fundamental sub-bands. It is
further demonstrated that the spin-entangled excitations, observable as
photoluminescence and absorption resonances, originate from an on-site
spin-flip transition confined to a magnetic atom (Mn or Ni). The
evolution of the spin-flip transition in a magnetic field is used to
deduce the effective exchange coupling and anisotropy constants. - Z91
- PUWILEY-V C H VERLAG GMBH
- PAPOSTFACH 101161, 69451 WEINHEIM, GERMANY
- VL13
- DI10.1002/advs.202505834
- UTWOS:001610214800001
- ER
- EF
|
2025
|
Jana, Dipankar; Vaclavkova, Diana; Ulaganathan, Rajesh Kumar; Sankar, Raman; Orlita, Milan; Faugeras, Clement; Koperski, Maciej; Zhitomirsky, M E; Potemski, Marek Strong and selective magnon-phonon coupling in the van der Waals
antiferromagnet CoPS3 PHYSICAL REVIEW B, 112 (16), 2025, DOI: 10.1103/8f92-lt57. Abstract | BibTeX | Endnote @article{WOS:001610486500003,
title = {Strong and selective magnon-phonon coupling in the van der Waals
antiferromagnet CoPS3},
author = {Dipankar Jana and Diana Vaclavkova and Rajesh Kumar Ulaganathan and Raman Sankar and Milan Orlita and Clement Faugeras and Maciej Koperski and M E Zhitomirsky and Marek Potemski},
doi = {10.1103/8f92-lt57},
times_cited = {2},
issn = {2469-9950},
year = {2025},
date = {2025-10-01},
journal = {PHYSICAL REVIEW B},
volume = {112},
number = {16},
publisher = {AMER PHYSICAL SOC},
address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
abstract = {The Raman scattering response of the biaxial antiferromagnet CoPS3 has
been investigated as a function of both magnetic field and temperature.
The peaks observed in the low-frequency spectral range (90-200 cm-1)
have been identified as hybrid magnon-phonon excitations. The energies
of the bare magnon and phonon modes and the effective coupling strengths
between different excitation pairs have been determined. The strong and
selective magnon-phonon interaction largely accounts for the pronounced
splitting of two phononlike modes observed at 152 and 158 cm-1 in the
antiferromagnetic phase of CoPS3. Based on the identification of bare
magnon excitations and their magnetic-field dependence, we propose an updated set of parameters for the effective exchange (Jeff = 9.9 meV) and biaxial magnetic anisotropy (D = 4.3 meV and E = -0.7 meV) and advocate for an apparent anisotropic g factor (gx = gy = 2},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The Raman scattering response of the biaxial antiferromagnet CoPS3 has
been investigated as a function of both magnetic field and temperature.
The peaks observed in the low-frequency spectral range (90-200 cm-1)
have been identified as hybrid magnon-phonon excitations. The energies
of the bare magnon and phonon modes and the effective coupling strengths
between different excitation pairs have been determined. The strong and
selective magnon-phonon interaction largely accounts for the pronounced
splitting of two phononlike modes observed at 152 and 158 cm-1 in the
antiferromagnetic phase of CoPS3. Based on the identification of bare
magnon excitations and their magnetic-field dependence, we propose an updated set of parameters for the effective exchange (Jeff = 9.9 meV) and biaxial magnetic anisotropy (D = 4.3 meV and E = -0.7 meV) and advocate for an apparent anisotropic g factor (gx = gy = 2 - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFDipankar Jana
Diana Vaclavkova
Rajesh Kumar Ulaganathan
Raman Sankar
Milan Orlita
Clement Faugeras
Maciej Koperski
M E Zhitomirsky
Marek Potemski
- TIStrong and selective magnon-phonon coupling in the van der Waals
antiferromagnet CoPS3 - SOPHYSICAL REVIEW B
- DTArticle
- ABThe Raman scattering response of the biaxial antiferromagnet CoPS3 has
been investigated as a function of both magnetic field and temperature.
The peaks observed in the low-frequency spectral range (90-200 cm-1)
have been identified as hybrid magnon-phonon excitations. The energies
of the bare magnon and phonon modes and the effective coupling strengths
between different excitation pairs have been determined. The strong and
selective magnon-phonon interaction largely accounts for the pronounced
splitting of two phononlike modes observed at 152 and 158 cm-1 in the
antiferromagnetic phase of CoPS3. Based on the identification of bare
magnon excitations and their magnetic-field dependence, we propose an updated set of parameters for the effective exchange (Jeff = 9.9 meV) and biaxial magnetic anisotropy (D = 4.3 meV and E = -0.7 meV) and advocate for an apparent anisotropic g factor (gx = gy = 2 - Z92
- PUAMER PHYSICAL SOC
- PAONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
- SN2469-9950
- VL112
- DI10.1103/8f92-lt57
- UTWOS:001610486500003
- ER
- EF
|
2024
|
Kipczak, Lucja; Zawadzka, Natalia; Jana, Dipankar; Antoniazzi, Igor; Grzeszczyk, Magdalena; Zinkiewicz, Malgorzata; Watanabe, Kenji; Taniguchi, Takashi; Potemski, Marek; Faugeras, Clement; Babinski, Adam; Molas, Maciej R Impact of temperature on the brightening of neutral and charged dark
excitons in WSe2 monolayer NANOPHOTONICS, 13 (26), pp. 4743-4749, 2024, DOI: 10.1515/nanoph-2024-0385. Abstract | BibTeX | Endnote @article{WOS:001359230900001,
title = {Impact of temperature on the brightening of neutral and charged dark
excitons in WSe2 monolayer},
author = {Lucja Kipczak and Natalia Zawadzka and Dipankar Jana and Igor Antoniazzi and Magdalena Grzeszczyk and Malgorzata Zinkiewicz and Kenji Watanabe and Takashi Taniguchi and Marek Potemski and Clement Faugeras and Adam Babinski and Maciej R Molas},
doi = {10.1515/nanoph-2024-0385},
times_cited = {0},
issn = {2192-8606},
year = {2024},
date = {2024-12-01},
journal = {NANOPHOTONICS},
volume = {13},
number = {26},
pages = {4743-4749},
publisher = {WALTER DE GRUYTER GMBH},
address = {GENTHINER STRASSE 13, D-10785 BERLIN, GERMANY},
abstract = {Optically dark states play an important role in the electronic and
optical properties of monolayers (MLs) of semiconducting transition
metal dichalcogenides. The effect of temperature on the in-plane-field
activation of the neutral and charged dark excitons is investigated in a
WSe2 ML encapsulated in hexagonal BN flakes. The brightening rates of
the neutral dark (XD) and grey (XG) excitons and the negative dark trion
(TD) differ substantially at particular temperature. More importantly,
they weaken considerably by about 3-4 orders of magnitude with
temperature increased from 4.2 K to 100 K. The quenching of the
dark-related emissions is accompanied by the two-order-of-magnitude
increase in the emissions of their neutral bright counterparts, i.e.
neutral bright exciton (XB) and spin-singlet (TS) and spin-triplet (TT)
negative trions, due to the thermal activations of dark states.
Furthermore, the energy splittings between the dark XD and TD complexes
and the corresponding bright XB, TS, and TT ones vary with temperature
rises from 4.2 K to 100 K. This is explained in terms of the different
exciton-phonon coupling for the bright and dark excitons stemming from
their distinct symmetry properties.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Optically dark states play an important role in the electronic and
optical properties of monolayers (MLs) of semiconducting transition
metal dichalcogenides. The effect of temperature on the in-plane-field
activation of the neutral and charged dark excitons is investigated in a
WSe2 ML encapsulated in hexagonal BN flakes. The brightening rates of
the neutral dark (XD) and grey (XG) excitons and the negative dark trion
(TD) differ substantially at particular temperature. More importantly,
they weaken considerably by about 3-4 orders of magnitude with
temperature increased from 4.2 K to 100 K. The quenching of the
dark-related emissions is accompanied by the two-order-of-magnitude
increase in the emissions of their neutral bright counterparts, i.e.
neutral bright exciton (XB) and spin-singlet (TS) and spin-triplet (TT)
negative trions, due to the thermal activations of dark states.
Furthermore, the energy splittings between the dark XD and TD complexes
and the corresponding bright XB, TS, and TT ones vary with temperature
rises from 4.2 K to 100 K. This is explained in terms of the different
exciton-phonon coupling for the bright and dark excitons stemming from
their distinct symmetry properties. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFLucja Kipczak
Natalia Zawadzka
Dipankar Jana
Igor Antoniazzi
Magdalena Grzeszczyk
Malgorzata Zinkiewicz
Kenji Watanabe
Takashi Taniguchi
Marek Potemski
Clement Faugeras
Adam Babinski
Maciej R Molas
- TIImpact of temperature on the brightening of neutral and charged dark
excitons in WSe2 monolayer - SONANOPHOTONICS
- DTArticle
- ABOptically dark states play an important role in the electronic and
optical properties of monolayers (MLs) of semiconducting transition
metal dichalcogenides. The effect of temperature on the in-plane-field
activation of the neutral and charged dark excitons is investigated in a
WSe2 ML encapsulated in hexagonal BN flakes. The brightening rates of
the neutral dark (XD) and grey (XG) excitons and the negative dark trion
(TD) differ substantially at particular temperature. More importantly,
they weaken considerably by about 3-4 orders of magnitude with
temperature increased from 4.2 K to 100 K. The quenching of the
dark-related emissions is accompanied by the two-order-of-magnitude
increase in the emissions of their neutral bright counterparts, i.e.
neutral bright exciton (XB) and spin-singlet (TS) and spin-triplet (TT)
negative trions, due to the thermal activations of dark states.
Furthermore, the energy splittings between the dark XD and TD complexes
and the corresponding bright XB, TS, and TT ones vary with temperature
rises from 4.2 K to 100 K. This is explained in terms of the different
exciton-phonon coupling for the bright and dark excitons stemming from
their distinct symmetry properties. - Z90
- PUWALTER DE GRUYTER GMBH
- PAGENTHINER STRASSE 13, D-10785 BERLIN, GERMANY
- SN2192-8606
- VL13
- BP4743
- EP4749
- DI10.1515/nanoph-2024-0385
- UTWOS:001359230900001
- ER
- EF
|