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Phonon-Assisted Resonant Tunneling of Electrons in Graphene–Boron Nitride Transistors
Physical Review Letters. 2016. Vol. 116. No. 18. P. 186603-1 -186603-5.
Vdovin E. E., Mishchenko A., Greenaway M. T., Ghazaryan D., Zhu M., Misra A., Cao Y., Morozov S. V., Makarovsky O., Fromhold T. M., Patanè A., Slotman G. J., Katsnelson M. I., Geim A. K., Novoselov K. S., Eaves L.
We observe a series of sharp resonant features in the differential conductance of graphene-hexagonal boron nitride-graphene tunnel transistors over a wide range of bias voltages between 10 and 200 mV. We attribute them to electron tunneling assisted by the emission of phonons of well-defined energy. The bias voltages at which they occur are insensitive to the applied gate voltage and hence independent of the carrier densities in the graphene electrodes, so plasmonic effects can be ruled out. The phonon energies corresponding to the resonances are compared with the lattice dispersion curves of graphene–boron nitride heterostructures and are close to peaks in the single phonon density of states.
Keywords: graphene
Wallbank J. R., Ghazaryan D., Misra A. et al., Science 2016 Vol. 353 No. 6299 P. 575-579
Chirality is a fundamental property of electrons with the relativistic spectrum found in graphene and topological insulators. It plays a crucial role in relativistic phenomena, such as Klein tunneling, but it is difficult to visualize directly. Here, we report the direct observation and manipulation of chirality and pseudospin polarization in the tunneling of electrons between ...
Added: October 31, 2018
Khestanova E., Birkbeck J., Zhu M. et al., Nano Letters 2018 Vol. 18 No. 4 P. 2623-2629
It is well-known that superconductivity in thin films is generally suppressed with decreasing thickness. This suppression is normally governed by either disorder-induced localization of Cooper pairs, weakening of Coulomb screening, or generation and unbinding of vortex–antivortex pairs as described by the Berezinskii–Kosterlitz–Thouless (BKT) theory. Defying general expectations, few-layer NbSe2, an archetypal example of ultrathin superconductors, ...
Added: October 31, 2018
Grebenko A. K., Krasnikov D. V., Bubis A. et al., Advanced Science 2022 Vol. 9 No. 12 Article 2200217
Following the game-changing high-pressure CO (HiPco) process that
established the first facile route toward large-scale production of single-walled
carbon nanotubes, CO synthesis of cm-sized graphene crystals of ultra-high
purity grown during tens of minutes is proposed. The Boudouard reaction
serves for the first time to produce individual monolayer structures on the
surface of a metal catalyst, thereby providing a chemical ...
Added: December 11, 2022
Gazaliev A. S., Moskotin M. V., V V Belosevich et al., Journal of Physics: Conference Series 2021 Vol. 2086 No. 1 Article 012054
The growing requirements for mobile communication networks (data transfer rates over 100 Gbps) makes it necessary to use carrier signal with a frequency of at least 100 GHz. This requires the development of cheap and broadband sub-terahertz (sub-THz) detectors. Here we report on our recent efforts toward the development of a heterodyne sub-THz detector based ...
Added: August 1, 2022
Zvyagina A., Melnikova E., Averin A. et al., Carbon 2018 Vol. 134 P. 62-70
Fabrication of graphene-based surface coatings through self-assembly may provide an affordable alternative to chemical vacuum deposition. Herein, we exploited the self-assembly of graphene oxide at the oil/water interfaces to form monolayers of 2D carbons on solid surfaces with different surface energy. We showed that interfacial monolayers with controlled packing density of graphene oxide can be ...
Added: July 16, 2018
Shabanov A., Moskotin M., Belosevich V. et al., Applied Physics Letters 2021 Vol. 119 No. 16 Article 163505
Detectors of terahertz radiation based on field-effect transistors (FETs) are among the most promising candidates for low-noise passive signal rectification both in imaging systems and wireless communications. However, it was not realized so far that geometric asymmetry of common FETs with respect to source-drain interchange is a strong objective to photovoltage harvesting. Here, we break ...
Added: May 20, 2022
Ghazaryan D., Greenaway M. T., Wang Z. et al., Nature Electronics 2018 Vol. 1 No. 6 P. 344-349
The growing family of two-dimensional (2D) materials1-3 can be used to assemble van der Waals heterostructures with a wide range of properties4-6 . Of particular interest are tunnelling heterostructures7-9 , which have been used to study the electronic states both in the tunnelling barrier and in the emitter and collector contacts10,11. Recently, 2D ferromagnets have ...
Added: October 31, 2018
Zhu M., Ghazaryan D., Son S. et al., 2D Materials 2017 Vol. 4 No. 1 P. 011013-1-011013-13
Crystallographic alignment between two-dimensional crystals in van der Waals heterostructures brought a number of profound physical phenomena, including observation of Hofstadter butterfly and topological currents, and promising novel applications, such as resonant tunnelling transistors. Here, by probing the electronic density of states in graphene using graphene-hexagonal boron nitride-graphene tunnelling transistors, we demonstrate a structural transition ...
Added: October 31, 2018
Yakov Matyushkin, Sergey D., Maxim M. et al., Nano Letters 2020 Vol. 20 No. 10 P. 7296-7303
Plasmonic interferometry is a rapidly growing area of research with a huge potential for applications in the terahertz frequency range. In this Letter, we explore a plasmonic interferometer based on graphene field effect transistor connected to specially designed antennas. As a key result, we observe helicity- and phase-sensitive conversion of circularly polarized radiation into dc ...
Added: March 2, 2021
Son S., Šiškins M., Mullan C. et al., 2D Materials 2018 Vol. 5 No. 1 P. 011006-1-011006-8
The excellent electronic and mechanical properties of graphene allow it to sustain very large currents, enabling its incandescence through Joule heating in suspended devices. Although interesting scientifically and promising technologically, this process is unattainable in ambient environment, because graphene quickly oxidises at high temperatures. Here, we take the performance of graphene-based incandescent devices to the ...
Added: October 31, 2018
Y E Matyushkin, I A Gayduchenko, M V M. et al., Journal of Physics: Conference Series 2018 Vol. 1124 No. 5 Article 051054
We report on detection of sub-THz radiation (129-430 GHz) using graphene based asymmetric field-effect transistor (FET) structures with different channel geometry: monolayer graphene, graphene nanoribbons. In all devices types we observed the similar trends of response on sub-THz radiation. The response fell with increasing frequency at room temperature, but increased with increasing frequency at 77 ...
Added: May 20, 2022
Zhukov A., Kryzhanovskaya N., Moiseev E. et al., Физика и техника полупроводников 2020 Т. 54 № 6 С. 570-574
A model is developed that makes it possible to analytically determine the threshold current of a microdisk laser with consideration for its self-heating as a function of the ambient temperature and the microlaser diameter. It is shown that there exists a minimum microdisk diameter determined by self-heating, up to which continuous-wave lasing can be reached ...
Added: September 15, 2020
Zhukov A., Moiseev E., Nadtochiy A. et al., Письма в Журнал технической физики 2021 Т. 47 № 13 С. 28-31
The energy consumption of an uncooled microdisk quantum well-dot laser under high-frequency modulation was investigated. For a microlaser with a diameter of 20 μm, the lowest power consumption of 1.6 pJ was obtained per one bit of data transmitted using an optical signal. ...
Added: October 11, 2021
E. I. Moiseev, N. V. Kryzhanovskaya, Zubov F. I. et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2022 Vol. 15 No. 3.2 P. 25-30
This paper is the first study of the far-field patterns of semiconductor microlasers with an active region based on In0.4Ga0.6As/GaAs quantum well-dots. A theoretical model describing the far-field radiation pattern is developed. It is shown that in the vertical direction the radiation pattern has a narrow beam divergence (the most of the power is confined ...
Added: March 15, 2023
Krichevsky D. M., Shi L., Baturin V. S. et al., Nanoscale 2022 Vol. 14 No. 5 P. 1978-1989
Molecular magnetism and specifically magnetic molecules have recently gained plenty of attention as key elements for quantum technologies, information processing, and spintronics. Transition to the nanoscale and implementation of ordered structures with defined parameters is crucial for advanced applications. Single-walled carbon nanotubes (SWCNTs) provide natural one-dimensional confinement that can be implemented for encapsulation, nanosynthesis, and ...
Added: June 19, 2022
Walls B., Murtagh O., Bozhko S. et al., Materials 2022 Vol. 15 No. 21 Article 7652
The strongly correlated electron material, vanadium dioxide (VO2), has seen considerable
attention and research application in metal-oxide electronics due to its metal-to-insulator transition
close to room temperature. Vacuum annealing a V2O5(010) single crystal results in Wadsley phases
(VnO2n+1, n > 1) and VO2. The resistance changes by a factor of 20 at 342 K, corresponding to the
metal-to-insulator phase ...
Added: December 11, 2022
Зубов Ф. И., Максимов М. В., Kryzhanovskaya N. et al., Письма в Журнал технической физики 2021 Т. 47 № 20 С. 3-6
The output power is studied under continuous-wave operation of microdisk lasers with InGaAs/GaAs quantum well-dots hybridly integrated with a silicon substrate with the epitaxial side down using the thermocompression bonding method. Owing a decrease in the thermal resistance and suppression of self-heating, an increase in the values of currents is observed at which the power ...
Added: October 14, 2021
Чупраков С. А., Блинов И. В., Загорский Д. Л. et al., Физика металлов и металловедение 2021 Т. 122 № 9 С. 933-939
In this work, by the method of matrix synthesis, nanowires (NPs) of various types were obtained - from pure cobalt, from an alloy of cobalt with copper and layer structures consisting of alternating layers of cobalt and copper of various thicknesses. Structural features of the arrays have been investigated by the method of nuclear magnetic ...
Added: November 12, 2021
Budkov Y., Kalikin N., Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2023 Vol. 107 No. 2 Article 024503
In this paper, we present a self-consistent field theory of macroscopic forces in spatially inhomogeneous flexible chain polyelectrolyte solutions. We derive an analytical expression for a stress tensor which consists of three terms: isotropic hydrostatic stress, electrostatic (Maxwell) stress, and stress rising from conformational entropy of polymer chains—conformational stress. We apply our theory to the ...
Added: February 15, 2023
A. N. Prikhodko, I. I. Belikov, Lvov A. V. et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2022 Vol. 15 No. 3.3 P. 345-349
At the moment, millimeter waves attract close attention not only of the scientific community, but also of the communication industry. Number of studies worldwide are currently focused on finding efficient solutions for the transceiver technologies compatible with beamforming and carrier frequencies beyond 100 GHz. It was recently demonstrated that the technology of integrated silicon photonic ...
Added: May 11, 2023
I.V. Bobkova, Bobkov A. M., Silaev M. A., Journal of Physics: Condensed Matter 2022 Vol. 34 Article 353001
The review is devoted to the fundamental aspects and characteristic features of the magnetoelectric effects, reported in the literature on Josephson junctions (JJs). The main focus of the review is on the manifestations of the direct and inverse magnetoelectric effects in various types of Josephson systems. They provide a coupling of the magnetization in superconductor/ferromagnet/superconductor ...
Added: October 27, 2022
Gwangwoo K., Sung-Soo K., Jonghyuk J. et al., Nature Communications 2019 Vol. 10 No. 1 P. 1-9
Despite a rich choice of two-dimensional materials, which exists these days, heterostructures, both vertical (van der Waals) and in-plane, offer an unprecedented control over the properties and functionalities of the resulted structures. Thus, planar heterostructures allow p-n junctions between different two-dimensional semiconductors and graphene nanoribbons with well-defined edges; and vertical heterostructures resulted in the observation ...
Added: January 31, 2019
N.A. Fominykh, F.I. Zubov, K.A. Ivanov et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2023 Vol. 16 No. 1.2 P. 126-132
In the present work, we study the possibility of the emission output of a semiconductor microring laser through a radially coupled optical waveguide. Room temperature lasing has been achieved in continuous wave regime with the wavelength of ~1090 nm. The characteristics of microlasers with and without waveguide have been compared. We have performed a spatial ...
Added: July 3, 2023
Novikov I., Nadtochiy A., Potapov A. Y. et al., Journal of Luminescence 2021 Vol. 239 Article 118393
The temperature dependencies of photoluminescence efficiency of InGaAlAs/InGaAs/InP heterostructures with
1550 nm range strained quantum wells have been studied. The heterostructures had nine In0.74Ga0.26As quantum
wells which were separated by In0.53Al0.20Ga0.27As barriers. The barriers were δ-doped with n- and p-type
dopants with different layer concentrations of charge carriers. The both p-type and n-type doping of barriers
leads to slight ...
Added: August 30, 2021