2025
|
Sokolik, Alexey A; Aminov, Azat F; Vdovin, Evgenii E; Khanin, Yurii N; Kashchenko, Mikhail A; Bandurin, Denis A; Ghazaryan, Davit A; Morozov, Sergey V; Novoselov, Kostya S Probing the features of electron dispersion by tunneling between
slightly twisted bilayer graphene sheets APPLIED PHYSICS LETTERS, 127 (23), 2025, DOI: 10.1063/5.0303858. Abstract | BibTeX | Endnote @article{WOS:001637543500003,
title = {Probing the features of electron dispersion by tunneling between
slightly twisted bilayer graphene sheets},
author = {Alexey A Sokolik and Azat F Aminov and Evgenii E Vdovin and Yurii N Khanin and Mikhail A Kashchenko and Denis A Bandurin and Davit A Ghazaryan and Sergey V Morozov and Kostya S Novoselov},
doi = {10.1063/5.0303858},
times_cited = {0},
issn = {0003-6951},
year = {2025},
date = {2025-12-01},
journal = {APPLIED PHYSICS LETTERS},
volume = {127},
number = {23},
publisher = {AIP Publishing},
address = {1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA},
abstract = {Tunneling conductance between two bilayer graphene (BLG) sheets
separated by 2 nm-thick insulating barrier was measured in two devices
with the twist angles between BLGs less than 1 degrees. At small bias
voltages, tunneling occurs with conservation of energy and momentum at
the points of intersection between two relatively shifted Fermi circles.
Here, we experimentally found and theoretically described signatures of
electron-hole asymmetric band structure of BLG: since holes are heavier,
the tunneling conductance is enhanced at the hole doping due to the
higher density of states. Another key feature of BLG that we explore is
gap opening in a vertical electric field with a strong polarization of
electron wave function at van Hove singularities near the gap edges.
This polarization, by shifting electron wave function in one BLG closer
to or father from the other BLG, gives rise to asymmetric tunneling
resonances in the conductance around charge neutrality points, which
result in strong sensitivity of the tunneling current to minor changes
of the gate voltages. The observed phenomena are reproduced by our
theoretical model taking into account electrostatics of the dual-gated
structure, quantum capacitance effects, and self-consistent gap openings
in both BLGs.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Tunneling conductance between two bilayer graphene (BLG) sheets
separated by 2 nm-thick insulating barrier was measured in two devices
with the twist angles between BLGs less than 1 degrees. At small bias
voltages, tunneling occurs with conservation of energy and momentum at
the points of intersection between two relatively shifted Fermi circles.
Here, we experimentally found and theoretically described signatures of
electron-hole asymmetric band structure of BLG: since holes are heavier,
the tunneling conductance is enhanced at the hole doping due to the
higher density of states. Another key feature of BLG that we explore is
gap opening in a vertical electric field with a strong polarization of
electron wave function at van Hove singularities near the gap edges.
This polarization, by shifting electron wave function in one BLG closer
to or father from the other BLG, gives rise to asymmetric tunneling
resonances in the conductance around charge neutrality points, which
result in strong sensitivity of the tunneling current to minor changes
of the gate voltages. The observed phenomena are reproduced by our
theoretical model taking into account electrostatics of the dual-gated
structure, quantum capacitance effects, and self-consistent gap openings
in both BLGs. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFAlexey A Sokolik
Azat F Aminov
Evgenii E Vdovin
Yurii N Khanin
Mikhail A Kashchenko
Denis A Bandurin
Davit A Ghazaryan
Sergey V Morozov
Kostya S Novoselov
- TIProbing the features of electron dispersion by tunneling between
slightly twisted bilayer graphene sheets - SOAPPLIED PHYSICS LETTERS
- DTArticle
- ABTunneling conductance between two bilayer graphene (BLG) sheets
separated by 2 nm-thick insulating barrier was measured in two devices
with the twist angles between BLGs less than 1 degrees. At small bias
voltages, tunneling occurs with conservation of energy and momentum at
the points of intersection between two relatively shifted Fermi circles.
Here, we experimentally found and theoretically described signatures of
electron-hole asymmetric band structure of BLG: since holes are heavier,
the tunneling conductance is enhanced at the hole doping due to the
higher density of states. Another key feature of BLG that we explore is
gap opening in a vertical electric field with a strong polarization of
electron wave function at van Hove singularities near the gap edges.
This polarization, by shifting electron wave function in one BLG closer
to or father from the other BLG, gives rise to asymmetric tunneling
resonances in the conductance around charge neutrality points, which
result in strong sensitivity of the tunneling current to minor changes
of the gate voltages. The observed phenomena are reproduced by our
theoretical model taking into account electrostatics of the dual-gated
structure, quantum capacitance effects, and self-consistent gap openings
in both BLGs. - Z90
- PUAIP Publishing
- PA1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
- SN0003-6951
- VL127
- DI10.1063/5.0303858
- UTWOS:001637543500003
- ER
- EF
|
Mylnikov, Dmitry A; Safonov, Ilya V; Kashchenko, Mikhail A; Novoselov, Kostya S; Bandurin, Denis A; Chernov, Alexander I; Svintsov, Dmitry A Hysteresis-controlled Van der Waals tunneling infrared detector enabled
by selective layer heating NPJ 2D MATERIALS AND APPLICATIONS, 9 (1), 2025, DOI: 10.1038/s41699-025-00612-x. Abstract | BibTeX | Endnote @article{WOS:001613817900003,
title = {Hysteresis-controlled Van der Waals tunneling infrared detector enabled
by selective layer heating},
author = {Dmitry A Mylnikov and Ilya V Safonov and Mikhail A Kashchenko and Kostya S Novoselov and Denis A Bandurin and Alexander I Chernov and Dmitry A Svintsov},
doi = {10.1038/s41699-025-00612-x},
times_cited = {0},
year = {2025},
date = {2025-11-01},
journal = {NPJ 2D MATERIALS AND APPLICATIONS},
volume = {9},
number = {1},
publisher = {NATURE PORTFOLIO},
address = {HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY},
abstract = {Mid-infrared (mid-IR) photodetectors play a crucial role in various
applications, including the development of biomimetic vision systems
that emulate neuronal function. In this work, we demonstrate a new
infrared photodetector based on graphene/boron nitride/graphene
tunneling heterostructure combining perception and memory functions. The
detection principle is based on the shift of the N-shaped tunneling
resonant feature in the I-V-curve upon infrared illumination. In the
current-biased mode, such a shift results in a strong voltage ``jump''
(0.05-1 V) to another branch of the I-V-characteristic that persists
after switching the radiation off. As a result, the structure can be
considered as a visual neuron that combines perception and memory
functions. More interestingly, the direction of voltage switching
depends on laser beam position, adding extra recognition functionality
to our perception device. The observed phenomena are explained within
the theory of selective light-induced heating of electrons in the
graphene layers, and the tunneling of hot carriers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mid-infrared (mid-IR) photodetectors play a crucial role in various
applications, including the development of biomimetic vision systems
that emulate neuronal function. In this work, we demonstrate a new
infrared photodetector based on graphene/boron nitride/graphene
tunneling heterostructure combining perception and memory functions. The
detection principle is based on the shift of the N-shaped tunneling
resonant feature in the I-V-curve upon infrared illumination. In the
current-biased mode, such a shift results in a strong voltage ``jump''
(0.05-1 V) to another branch of the I-V-characteristic that persists
after switching the radiation off. As a result, the structure can be
considered as a visual neuron that combines perception and memory
functions. More interestingly, the direction of voltage switching
depends on laser beam position, adding extra recognition functionality
to our perception device. The observed phenomena are explained within
the theory of selective light-induced heating of electrons in the
graphene layers, and the tunneling of hot carriers. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFDmitry A Mylnikov
Ilya V Safonov
Mikhail A Kashchenko
Kostya S Novoselov
Denis A Bandurin
Alexander I Chernov
Dmitry A Svintsov
- TIHysteresis-controlled Van der Waals tunneling infrared detector enabled
by selective layer heating - SONPJ 2D MATERIALS AND APPLICATIONS
- DTArticle
- ABMid-infrared (mid-IR) photodetectors play a crucial role in various
applications, including the development of biomimetic vision systems
that emulate neuronal function. In this work, we demonstrate a new
infrared photodetector based on graphene/boron nitride/graphene
tunneling heterostructure combining perception and memory functions. The
detection principle is based on the shift of the N-shaped tunneling
resonant feature in the I-V-curve upon infrared illumination. In the
current-biased mode, such a shift results in a strong voltage ``jump''
(0.05-1 V) to another branch of the I-V-characteristic that persists
after switching the radiation off. As a result, the structure can be
considered as a visual neuron that combines perception and memory
functions. More interestingly, the direction of voltage switching
depends on laser beam position, adding extra recognition functionality
to our perception device. The observed phenomena are explained within
the theory of selective light-induced heating of electrons in the
graphene layers, and the tunneling of hot carriers. - Z90
- PUNATURE PORTFOLIO
- PAHEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY
- VL9
- DI10.1038/s41699-025-00612-x
- UTWOS:001613817900003
- ER
- EF
|
Lukianov, M Y; Maevskiy, A; Kazeev, N; Mylnikov, D; Svintsov, D A; Novoselov, K S; Ustyuzhanin, A; Bandurin, D A Inverse design of broadband antennas for terahertz devices based on
two-dimensional materials PHYSICAL REVIEW APPLIED, 24 (5), 2025, DOI: 10.1103/gr2z-3qjp. Abstract | BibTeX | Endnote @article{WOS:001633477300003,
title = {Inverse design of broadband antennas for terahertz devices based on
two-dimensional materials},
author = {M Y Lukianov and A Maevskiy and N Kazeev and D Mylnikov and D A Svintsov and K S Novoselov and A Ustyuzhanin and D A Bandurin},
doi = {10.1103/gr2z-3qjp},
times_cited = {0},
issn = {2331-7019},
year = {2025},
date = {2025-11-01},
journal = {PHYSICAL REVIEW APPLIED},
volume = {24},
number = {5},
publisher = {AMER PHYSICAL SOC},
address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
abstract = {Terahertz technology, a cornerstone of next-generation high-speed
communication and sensing, has long been hindered by impedance mismatch
challenges that limit device performance and applicability. These
challenges become particularly pronounced when ultrasensitive
two-dimensional (2D) materials are employed as the detecting element in
the terahertz range, further complicating their integration in realworld
applications. Furthermore, conventional antenna designs often fail to
provide adequate matching across the broad terahertz spectrum. In this
work, we tackle these challenges using a procedural generation algorithm
to design terahertz broadband antennas that satisfy specific performance
criteria. Namely, the developed inverse design methodology enables
customization for the target impedance value, bandwidth, and contact
topology requirements. The proposed antenna achieves an improvement of
up to 40% in power transfer efficiency, compared with traditional
bow-tie antennas, under realistic operating conditions. High-fidelity
electromagnetic simulations validate these results, confirming the
design's practicality for terahertz applications. This work addresses
critical limitations of existing antenna designs and advances the
feasibility of high-frequency applications in both communication and
sensing.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Terahertz technology, a cornerstone of next-generation high-speed
communication and sensing, has long been hindered by impedance mismatch
challenges that limit device performance and applicability. These
challenges become particularly pronounced when ultrasensitive
two-dimensional (2D) materials are employed as the detecting element in
the terahertz range, further complicating their integration in realworld
applications. Furthermore, conventional antenna designs often fail to
provide adequate matching across the broad terahertz spectrum. In this
work, we tackle these challenges using a procedural generation algorithm
to design terahertz broadband antennas that satisfy specific performance
criteria. Namely, the developed inverse design methodology enables
customization for the target impedance value, bandwidth, and contact
topology requirements. The proposed antenna achieves an improvement of
up to 40% in power transfer efficiency, compared with traditional
bow-tie antennas, under realistic operating conditions. High-fidelity
electromagnetic simulations validate these results, confirming the
design's practicality for terahertz applications. This work addresses
critical limitations of existing antenna designs and advances the
feasibility of high-frequency applications in both communication and
sensing. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFM Y Lukianov
A Maevskiy
N Kazeev
D Mylnikov
D A Svintsov
K S Novoselov
A Ustyuzhanin
D A Bandurin
- TIInverse design of broadband antennas for terahertz devices based on
two-dimensional materials - SOPHYSICAL REVIEW APPLIED
- DTArticle
- ABTerahertz technology, a cornerstone of next-generation high-speed
communication and sensing, has long been hindered by impedance mismatch
challenges that limit device performance and applicability. These
challenges become particularly pronounced when ultrasensitive
two-dimensional (2D) materials are employed as the detecting element in
the terahertz range, further complicating their integration in realworld
applications. Furthermore, conventional antenna designs often fail to
provide adequate matching across the broad terahertz spectrum. In this
work, we tackle these challenges using a procedural generation algorithm
to design terahertz broadband antennas that satisfy specific performance
criteria. Namely, the developed inverse design methodology enables
customization for the target impedance value, bandwidth, and contact
topology requirements. The proposed antenna achieves an improvement of
up to 40% in power transfer efficiency, compared with traditional
bow-tie antennas, under realistic operating conditions. High-fidelity
electromagnetic simulations validate these results, confirming the
design's practicality for terahertz applications. This work addresses
critical limitations of existing antenna designs and advances the
feasibility of high-frequency applications in both communication and
sensing. - Z90
- PUAMER PHYSICAL SOC
- PAONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
- SN2331-7019
- VL24
- DI10.1103/gr2z-3qjp
- UTWOS:001633477300003
- ER
- EF
|
Kudriashov, A; Hovhannisyan, R A; Zhou, X; Elesin, L; Yashina, L V; Novoselov, K S; Bandurin, D A Reconstructing critical current density in Josephson junctions with
phase nonlinearity PHYSICAL REVIEW B, 112 (6), 2025, DOI: 10.1103/lgpj-wy72. Abstract | BibTeX | Endnote @article{WOS:001553737700001,
title = {Reconstructing critical current density in Josephson junctions with
phase nonlinearity},
author = {A Kudriashov and R A Hovhannisyan and X Zhou and L Elesin and L V Yashina and K S Novoselov and D A Bandurin},
doi = {10.1103/lgpj-wy72},
times_cited = {1},
issn = {2469-9950},
year = {2025},
date = {2025-08-01},
journal = {PHYSICAL REVIEW B},
volume = {112},
number = {6},
publisher = {AMER PHYSICAL SOC},
address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
abstract = {In this Letter, we show that the standard Dynes-Fulton analysis,
commonly used to reconstruct the critical current density from
interference patterns, breaks down in Josephson junctions with nonlinear
phase distributions, leading to nonphysical artifacts. To address this,
we developed a simple iterative reconstruction algorithm and validated
it both numerically and experimentally using a planar Josephson junction
model. Unlike conventional approaches based on the logarithmic Hilbert
transform, the proposed method allows for incorporating prior knowledge
about the system and addresses the fundamental issue of ambiguity in
reconstructing the critical current density from interference patterns.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this Letter, we show that the standard Dynes-Fulton analysis,
commonly used to reconstruct the critical current density from
interference patterns, breaks down in Josephson junctions with nonlinear
phase distributions, leading to nonphysical artifacts. To address this,
we developed a simple iterative reconstruction algorithm and validated
it both numerically and experimentally using a planar Josephson junction
model. Unlike conventional approaches based on the logarithmic Hilbert
transform, the proposed method allows for incorporating prior knowledge
about the system and addresses the fundamental issue of ambiguity in
reconstructing the critical current density from interference patterns. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFA Kudriashov
R A Hovhannisyan
X Zhou
L Elesin
L V Yashina
K S Novoselov
D A Bandurin
- TIReconstructing critical current density in Josephson junctions with
phase nonlinearity - SOPHYSICAL REVIEW B
- DTArticle
- ABIn this Letter, we show that the standard Dynes-Fulton analysis,
commonly used to reconstruct the critical current density from
interference patterns, breaks down in Josephson junctions with nonlinear
phase distributions, leading to nonphysical artifacts. To address this,
we developed a simple iterative reconstruction algorithm and validated
it both numerically and experimentally using a planar Josephson junction
model. Unlike conventional approaches based on the logarithmic Hilbert
transform, the proposed method allows for incorporating prior knowledge
about the system and addresses the fundamental issue of ambiguity in
reconstructing the critical current density from interference patterns. - Z91
- PUAMER PHYSICAL SOC
- PAONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
- SN2469-9950
- VL112
- DI10.1103/lgpj-wy72
- UTWOS:001553737700001
- ER
- EF
|
Kudriashov, Andrei; Zhou, Xiangyu; Hovhannisyan, Razmik A; Frolov, Alexander S; Elesin, Leonid; Wang, Yi Bo; Zharkova, Ekaterina V; Taniguchi, Takashi; Watanabe, Kenji; Liu, Zheng; Novoselov, Kostya S; Yashina, Lada V; Zhou, Xin; Bandurin, Denis A Non-Majorana origin of anomalous current-phase relation and Josephson
diode effect in Bi2SE3/NbSe2 Josephson
junctions SCIENCE ADVANCES, 11 (24), 2025, DOI: 10.1126/sciadv.adw6925. Abstract | BibTeX | Endnote @article{WOS:001508114400008,
title = {Non-Majorana origin of anomalous current-phase relation and Josephson
diode effect in Bi2SE3/NbSe2 Josephson
junctions},
author = {Andrei Kudriashov and Xiangyu Zhou and Razmik A Hovhannisyan and Alexander S Frolov and Leonid Elesin and Yi Bo Wang and Ekaterina V Zharkova and Takashi Taniguchi and Kenji Watanabe and Zheng Liu and Kostya S Novoselov and Lada V Yashina and Xin Zhou and Denis A Bandurin},
doi = {10.1126/sciadv.adw6925},
times_cited = {7},
year = {2025},
date = {2025-06-01},
journal = {SCIENCE ADVANCES},
volume = {11},
number = {24},
publisher = {AMER ASSOC ADVANCEMENT SCIENCE},
address = {1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA},
abstract = {Josephson junctions (JJs) are key to superconducting quantum
technologies and the search for self-conjugate quasiparticles
potentially useful for fault-tolerant quantum computing. In topological
insulator (TI)-based JJs, measuring the current-phase relation (CPR) can
reveal unconventional effects such as Majorana bound states (MBS) and
nonreciprocal transport. However, reconstructing CPR as a function of
magnetic field has not been attempted. Here, we present a platform for
field-dependent CPR measurements in planar JJs made of NbSe2 and
few-layer Bi2Se3. When a flux quantum Phi 0 threads the junction, we
observe anomalous peak-dip CPR structure and nonreciprocal supercurrent
flow. We show that these arise from a nonuniform supercurrent
distribution that also leads to a robust and tunable Josephson diode
effect. Furthermore, despite numerous previous studies, we find no
evidence of MBS. Our results establish magnetic field-dependent CPR as a
powerful probe of TI-based superconducting devices and offer design
strategies for nonreciprocal superconducting electronics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Josephson junctions (JJs) are key to superconducting quantum
technologies and the search for self-conjugate quasiparticles
potentially useful for fault-tolerant quantum computing. In topological
insulator (TI)-based JJs, measuring the current-phase relation (CPR) can
reveal unconventional effects such as Majorana bound states (MBS) and
nonreciprocal transport. However, reconstructing CPR as a function of
magnetic field has not been attempted. Here, we present a platform for
field-dependent CPR measurements in planar JJs made of NbSe2 and
few-layer Bi2Se3. When a flux quantum Phi 0 threads the junction, we
observe anomalous peak-dip CPR structure and nonreciprocal supercurrent
flow. We show that these arise from a nonuniform supercurrent
distribution that also leads to a robust and tunable Josephson diode
effect. Furthermore, despite numerous previous studies, we find no
evidence of MBS. Our results establish magnetic field-dependent CPR as a
powerful probe of TI-based superconducting devices and offer design
strategies for nonreciprocal superconducting electronics. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFAndrei Kudriashov
Xiangyu Zhou
Razmik A Hovhannisyan
Alexander S Frolov
Leonid Elesin
Yi Bo Wang
Ekaterina V Zharkova
Takashi Taniguchi
Kenji Watanabe
Zheng Liu
Kostya S Novoselov
Lada V Yashina
Xin Zhou
Denis A Bandurin
- TINon-Majorana origin of anomalous current-phase relation and Josephson
diode effect in Bi2SE3/NbSe2 Josephson
junctions - SOSCIENCE ADVANCES
- DTArticle
- ABJosephson junctions (JJs) are key to superconducting quantum
technologies and the search for self-conjugate quasiparticles
potentially useful for fault-tolerant quantum computing. In topological
insulator (TI)-based JJs, measuring the current-phase relation (CPR) can
reveal unconventional effects such as Majorana bound states (MBS) and
nonreciprocal transport. However, reconstructing CPR as a function of
magnetic field has not been attempted. Here, we present a platform for
field-dependent CPR measurements in planar JJs made of NbSe2 and
few-layer Bi2Se3. When a flux quantum Phi 0 threads the junction, we
observe anomalous peak-dip CPR structure and nonreciprocal supercurrent
flow. We show that these arise from a nonuniform supercurrent
distribution that also leads to a robust and tunable Josephson diode
effect. Furthermore, despite numerous previous studies, we find no
evidence of MBS. Our results establish magnetic field-dependent CPR as a
powerful probe of TI-based superconducting devices and offer design
strategies for nonreciprocal superconducting electronics. - Z97
- PUAMER ASSOC ADVANCEMENT SCIENCE
- PA1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA
- VL11
- DI10.1126/sciadv.adw6925
- UTWOS:001508114400008
- ER
- EF
|
