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Yang Z, Yang Q, Hu J, Liu DE. Dissipative Floquet Majorana Modes in Proximity-Induced Topological Superconductors. PHYSICAL REVIEW LETTERS 2021; 126:086801. [PMID: 33709754 DOI: 10.1103/physrevlett.126.086801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 08/27/2020] [Accepted: 01/28/2021] [Indexed: 06/12/2023]
Abstract
We study a realistic Floquet topological superconductor, a periodically driven nanowire proximitized to an equilibrium s-wave superconductor. Because of the strong energy and density fluctuations caused by the superconducting proximity effect, the Floquet Majorana wire becomes dissipative. We show that the Floquet band structure is still preserved in this dissipative system. In particular, we find that the Floquet Majorana zero and π modes can no longer be simply described by the Floquet topological band theory. We also propose an effective model to simplify the calculation of the lifetime of these Floquet Majoranas and find that the lifetime can be engineered by the external driving field.
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Affiliation(s)
- Zhesen Yang
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Qinghong Yang
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Beijing Academy of Quantum Information Sciences, Beijing 100193, China
| | - Jiangping Hu
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
- South Bay Interdisciplinary Science Center, Dongguan, Guangdong 523808, China
| | - Dong E Liu
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Beijing Academy of Quantum Information Sciences, Beijing 100193, China
- Frontier Science Center for Quantum Information, Beijing 100184, China
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2
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Mönch E, Bandurin DA, Dmitriev IA, Phinney IY, Yahniuk I, Taniguchi T, Watanabe K, Jarillo-Herrero P, Ganichev SD. Observation of Terahertz-Induced Magnetooscillations in Graphene. NANO LETTERS 2020; 20:5943-5950. [PMID: 32697917 DOI: 10.1021/acs.nanolett.0c01918] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
When high-frequency radiation is incident upon graphene subjected to a perpendicular magnetic field, graphene absorbs incident photons by allowing transitions between nearest Landau levels that follow strict selection rules dictated by angular momentum conservation. Here, we show a qualitative deviation from this behavior in high-quality graphene devices exposed to terahertz (THz) radiation. We demonstrate the emergence of a pronounced THz-driven photoresponse, which exhibits low-field magnetooscillations governed by the ratio of the frequency of the incoming radiation and the quasiclassical cyclotron frequency. We analyze the modifications of generated photovoltage with the radiation frequency and carrier density and demonstrate that the observed photoresponse shares a common origin with microwave-induced resistance oscillations discovered in GaAs-based heterostructures; however, in graphene it appears at much higher frequencies and persists above liquid nitrogen temperatures. Our observations expand the family of radiation-driven phenomena in graphene, paving the way for future studies of nonequilibrium electron transport.
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Affiliation(s)
- Erwin Mönch
- Terahertz Center, University of Regensburg, 93040 Regensburg, Germany
| | - Denis A Bandurin
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Ivan A Dmitriev
- Terahertz Center, University of Regensburg, 93040 Regensburg, Germany
- Ioffe Institute, 194021 St. Petersburg, Russia
| | - Isabelle Y Phinney
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Ivan Yahniuk
- CENTERA, Institute of High Pressure Physics PAS, 01142 Warsaw, Poland
| | - Takashi Taniguchi
- International Center for Materials Nanoarchitectonics, National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Kenji Watanabe
- Research Center for Functional Materials, National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Pablo Jarillo-Herrero
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Sergey D Ganichev
- Terahertz Center, University of Regensburg, 93040 Regensburg, Germany
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3
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Chang CC, Lin L, Chen GY. Photon-Assisted Perfect Conductivity Between Arrays of Two-Level Atoms. Sci Rep 2019; 9:13033. [PMID: 31506596 PMCID: PMC6736950 DOI: 10.1038/s41598-019-49606-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 08/23/2019] [Indexed: 11/09/2022] Open
Abstract
We investigate interactions between two (parallel) arrays of two-level atoms (2LA) via photons through quantum electrodynamical interaction with one array (the source array) connected to a particle source, and we study the (photo-)resistivity of the other array (the measured array). The wave function of the interacted photon propagating in an array is a Bloch wave with a gap in its eigenvalue (the photonic dispersion). Due to interactions between arrayed 2LA and the dressed photonic field with non-linear dispersion, the conduction behaviors of the measured array can be very diversified according to the input energy of the particle source connected to the source array, and their relative positions. As a result, the resistivity of the measured array can be zero or negative, and can also be oscillatory with respect to the incoming energy of the particle source of the source array, and the separation between arrays.
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Affiliation(s)
- Chih-Chun Chang
- Department of Physics, National Chung Hsing University, Taichung, 402, Taiwan
| | - Lee Lin
- Department of Physics, National Chung Hsing University, Taichung, 402, Taiwan.
| | - Guang-Yin Chen
- Department of Physics, National Chung Hsing University, Taichung, 402, Taiwan.
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4
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Laitinen A, Kumar M, Hakonen P, Sonin E. Gyrotropic Zener tunneling and nonlinear IV curves in the zero-energy Landau level of graphene in a strong magnetic field. Sci Rep 2018; 8:594. [PMID: 29330431 PMCID: PMC5766577 DOI: 10.1038/s41598-017-18959-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 11/20/2017] [Indexed: 11/17/2022] Open
Abstract
We have investigated tunneling current through a suspended graphene Corbino disk in high magnetic fields at the Dirac point, i.e. at filling factor ν = 0. At the onset of the dielectric breakdown the current through the disk grows exponentially before ohmic behaviour, but in a manner distinct from thermal activation. We find that Zener tunneling between Landau sublevels dominates, facilitated by tilting of the source-drain bias potential. According to our analytic modelling, the Zener tunneling is strongly affected by the gyrotropic force (Lorentz force) due to the high magnetic field.
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Affiliation(s)
- Antti Laitinen
- Aalto University, Low Temperature Laboratory, Department of Applied Physics, Espoo, Finland
| | - Manohar Kumar
- Aalto University, Low Temperature Laboratory, Department of Applied Physics, Espoo, Finland
| | - Pertti Hakonen
- Aalto University, Low Temperature Laboratory, Department of Applied Physics, Espoo, Finland.
| | - Edouard Sonin
- Racah Institute of Physics, Hebrew University of Jerusalem, Givat Ram, Jerusalem, 91904, Israel
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5
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Dressed Photons Induced Resistance Oscillation and Zero Resistance in Arrayed Simple Harmonic Oscillators with No Impurity. Sci Rep 2016; 6:37763. [PMID: 27886252 PMCID: PMC5123571 DOI: 10.1038/srep37763] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Accepted: 11/01/2016] [Indexed: 11/25/2022] Open
Abstract
We investigate a system of an array of N simple harmonic oscillators (SHO) interacting with photons through QED interaction. As the energy of photon is around the spacing between SHO energy levels, energy gaps appear in the dispersion relation of the interacted (dressed) photons. This is quite different from the dispersion relation of free photons. Due to interactions between dressed photonic field and arrayed SHO, the photoresistance of this system shows oscillations and also drops to zero as irradiated by EM field of varying frequencies.
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6
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Dorozhkin SI, Kapustin AA, Umansky V, von Klitzing K, Smet JH. Microwave-Induced Oscillations in Magnetocapacitance: Direct Evidence for Nonequilibrium Occupation of Electronic States. PHYSICAL REVIEW LETTERS 2016; 117:176801. [PMID: 27824453 DOI: 10.1103/physrevlett.117.176801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Indexed: 06/06/2023]
Abstract
In a two-dimensional electron system, microwave radiation may induce giant resistance oscillations. Their origin has been debated controversially and numerous mechanisms based on very different physical phenomena have been invoked. However, none of them have been unambiguously experimentally identified, since they produce similar effects in transport studies. The capacitance of a two-subband system is sensitive to a redistribution of electrons over energy states, since it entails a shift of the electron charge perpendicular to the plane. In such a system, microwave-induced magnetocapacitance oscillations have been observed. They can only be accounted for by an electron distribution function oscillating with energy due to Landau quantization, one of the quantum mechanisms proposed for the resistance oscillations.
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Affiliation(s)
- S I Dorozhkin
- Institute of Solid State Physics RAS, 142432 Chernogolovka, Moscow district, Russia
| | - A A Kapustin
- Institute of Solid State Physics RAS, 142432 Chernogolovka, Moscow district, Russia
| | - V Umansky
- Department of Physics, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - K von Klitzing
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
| | - J H Smet
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
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7
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Yamashiro R, Abdurakhimov LV, Badrutdinov AO, Monarkha YP, Konstantinov D. Photoconductivity Response at Cyclotron-Resonance Harmonics in a Nondegenerate Two-Dimensional Electron Gas on Liquid Helium. PHYSICAL REVIEW LETTERS 2015; 115:256802. [PMID: 26722938 DOI: 10.1103/physrevlett.115.256802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Indexed: 06/05/2023]
Abstract
We report the first observation of an oscillatory photoconductivity response at the cyclotron-resonance harmonics in a nondegenerate 2D electron system formed on the free surface of liquid helium. The dc conductivity oscillations are detected for electrons occupying the ground surface subband. Their period is governed by the ratio of the microwave frequency to the cyclotron frequency. Theoretical analysis of the photoresponse in a strongly interacting electron system indicates that the observation can be explained by an oscillatory correction to the electron distribution function that appears for a large inelastic relaxation time because of photon-assisted scattering.
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Affiliation(s)
- R Yamashiro
- Okinawa Institute of Science and Technology, Tancha 1919-1, Okinawa 904-0495, Japan
| | - L V Abdurakhimov
- Okinawa Institute of Science and Technology, Tancha 1919-1, Okinawa 904-0495, Japan
| | - A O Badrutdinov
- Okinawa Institute of Science and Technology, Tancha 1919-1, Okinawa 904-0495, Japan
| | - Yu P Monarkha
- Institute for Low Temperature Physics and Engineering, 47 Lenin Avenue, 61103 Kharkov, Ukraine
| | - D Konstantinov
- Okinawa Institute of Science and Technology, Tancha 1919-1, Okinawa 904-0495, Japan
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8
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Dorozhkin SI, Umansky V, Pfeiffer LN, West KW, Baldwin K, von Klitzing K, Smet JH. Random flips of electric field in microwave-induced states with spontaneously broken symmetry. PHYSICAL REVIEW LETTERS 2015; 114:176808. [PMID: 25978254 DOI: 10.1103/physrevlett.114.176808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Indexed: 06/04/2023]
Abstract
In a two-dimensional electron system subject to microwaves and a magnetic field, photovoltages emerge. They can be separated into two components originating from built-in electric fields and electric field domains arising from spontaneous symmetry breaking. The latter occurs in the zero resistance regime only and manifests itself in pulsed behavior, synchronous across the sample. The pulses show sign reversal. This implies a flip of the field in each domain, consistent with the existence of two equally probable electric field domain configurations due to the spontaneous symmetry breaking.
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Affiliation(s)
- S I Dorozhkin
- Institute of Solid State Physics, Chernogolovka, Moscow District 142432, Russia
| | - V Umansky
- Department of Physics, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - L N Pfeiffer
- Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA
| | - K W West
- Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA
| | - K Baldwin
- Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA
| | - K von Klitzing
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
| | - J H Smet
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
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9
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Wang Z, Mohammadzadeh S, Schmaltz T, Kirschner J, Khassanov A, Eigler S, Mundloch U, Backes C, Steinrück HG, Magerl A, Hauke F, Hirsch A, Halik M. Region-selective self-assembly of functionalized carbon allotropes from solution. ACS NANO 2013; 7:11427-11434. [PMID: 24274682 DOI: 10.1021/nn405488n] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Approaches for the selective self-assembly of functionalized carbon allotropes from solution are developed and validated for 0D-fullerenes, 1D-carbon nanotubes and 2D-graphene. By choosing the right molecular interaction of self-assembled monolayers (serving the surface) with the functionalization features of carbon materials, which provide the solubility but also serve the driving force for assembly, we demonstrate a region-selective and self-terminating assembly of the materials. Active layers of the carbon allotropes can be selectively deposited in the channel region of thin-film transistor (TFT) devices by this approach. As an example for a 0D system, molecules of C60 functionalized octadecylphosphonic acids are used to realize self-assembled monolayer field-effect transistors (SAMFETs) based on a selective molecular exchange reaction of stearic acid in the channel region. For noncovalently functionalized single-walled carbon nanotubes (SWCNTs) and graphene oxide (GO) flakes, the electrostatic Coulomb interactions between the functional groups of the carbon allotropes and the charged head groups of a SAM dielectric layer are utilized to implement the selective deposition.
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Affiliation(s)
- Zhenxing Wang
- Organic Materials & Devices (OMD), Institute of Polymer Materials, University Erlangen-Nürnberg , Martensstraße 7, 91058 Erlangen, Germany
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10
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Dmitriev IA, Khodas M, Mirlin AD, Polyakov DG. Emergence of domains and nonlinear transport in the zero-resistance state. PHYSICAL REVIEW LETTERS 2013; 111:206801. [PMID: 24289699 DOI: 10.1103/physrevlett.111.206801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Indexed: 06/02/2023]
Abstract
We study transport in the domain state, the so-called zero-resistance state, that emerges in a two-dimensional electron system in which the combined action of microwave radiation and magnetic field produces a negative absolute conductivity. We show that the voltage-biased system has a rich phase diagram in the system size and voltage plane, with second- and first-order transitions between the domain and homogeneous states for small and large voltages, respectively. We find the residual negative dissipative resistance in the stable domain state.
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Affiliation(s)
- I A Dmitriev
- Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany and Institut für Theorie der Kondensierten Materie and DFG Center for Functional Nanostructures, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany and Institut für Nanotechnologie, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany and Ioffe Physical Technical Institute, 194021 St. Petersburg, Russia
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11
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Song J, Liu H, Jiang H. Quantum pump effect induced by a linearly polarized microwave in a two-dimensional electron gas. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:215304. [PMID: 22575800 DOI: 10.1088/0953-8984/24/21/215304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A quantum pump effect is predicted in an ideal homogeneous two-dimensional electron gas (2DEG) that is normally irradiated by linearly polarized microwaves (MW). Without considering effects from spin-orbital coupling or the magnetic field, it is found that a polarized MW can continuously pump electrons from the longitudinal to the transverse direction, or from the transverse to the longitudinal direction, in the central irradiated region. The large pump current is obtained for both the low frequency limit and the high frequency case. Its magnitude depends on sample properties such as the size of the radiated region, the power and frequency of the MW, etc. Through the calculated results, the pump current should be attributed to the dominant photon-assisted tunneling processes as well as the asymmetry of the electron density of states with respect to the Fermi energy.
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Affiliation(s)
- Juntao Song
- Department of Physics and Hebei Advanced Thin Film Laboratory, Hebei Normal University, Hebei 050024, People's Republic of China
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12
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Dai Y, Du RR, Pfeiffer LN, West KW. Observation of a cyclotron harmonic spike in microwave-induced resistances in ultraclean GaAs/AlGaAs quantum wells. PHYSICAL REVIEW LETTERS 2010; 105:246802. [PMID: 21231545 DOI: 10.1103/physrevlett.105.246802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2010] [Indexed: 05/30/2023]
Abstract
We report the observation of a colossal, narrow resistance peak that arises in ultraclean (mobility ∼3×10⁷ cm²/V s) GaAs/AlGaAs quantum wells (QWs) under millimeter wave irradiation and a weak magnetic field. Such a spike is superposed on the 2nd harmonic microwave-induced resistance oscillations (MIRO) but having an amplitude >300% of the MIRO, and a typical FWHM ∼50 mK, comparable with the Landau level width. Systematic studies show a correlation between the spike and a pronounced negative magnetoresistance in these QWs, suggesting a mechanism based on the interplay of strong scatterers and smooth disorder. Alternatively, the spike may be interpreted as a manifestation of quantum interference between the quadrupole resonance and the higher-order cyclotron transition in well-separated Landau levels.
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Affiliation(s)
- Yanhua Dai
- Department of Physics and Astronomy, Rice University, Houston, Texas 77251-1892, USA
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13
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Konstantinov D, Kono K. Photon-induced vanishing of magnetoconductance in 2D electrons on liquid helium. PHYSICAL REVIEW LETTERS 2010; 105:226801. [PMID: 21231410 DOI: 10.1103/physrevlett.105.226801] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2010] [Indexed: 05/30/2023]
Abstract
We report on a novel transport phenomenon realized by optical pumping in surface state electrons on helium subjected to perpendicular magnetic fields. The electron dynamics is governed by the photon-induced excitation and scattering-mediated transitions between electric subbands. In a range of magnetic fields, we observe vanishing longitudinal conductivity σ(xx)→0. Our result suggests the existence of radiation-induced zero-resistance states in the nondegenerate 2D electron system.
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Affiliation(s)
- Denis Konstantinov
- Low Temperature Physics Laboratory, RIKEN, Hirosawa 2-1, Wako 351-0198, Japan.
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14
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Khodas M, Chiang HS, Hatke AT, Zudov MA, Vavilov MG, Pfeiffer LN, West KW. Nonlinear magnetoresistance oscillations in intensely irradiated two-dimensional electron systems induced by multiphoton processes. PHYSICAL REVIEW LETTERS 2010; 104:206801. [PMID: 20867049 DOI: 10.1103/physrevlett.104.206801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2009] [Indexed: 05/29/2023]
Abstract
We report on magneto-oscillations in differential resistivity of a two-dimensional electron system subject to intense microwave radiation. The period of these oscillations is determined not only by microwave frequency but also by its intensity. A theoretical model based on quantum kinetics at high microwave power captures all important characteristics of this phenomenon which is strongly nonlinear in microwave intensity. Our results demonstrate a crucial role of the multiphoton processes near the cyclotron resonance and its harmonics in the presence of strong dc electric field and offer a unique way to reliably determine the intensity of microwaves acting on electrons.
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Affiliation(s)
- M Khodas
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
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15
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Hatke AT, Zudov MA, Pfeiffer LN, West KW. Phonon-induced resistance oscillations in 2D systems with a very high electron mobility. PHYSICAL REVIEW LETTERS 2009; 102:086808. [PMID: 19257773 DOI: 10.1103/physrevlett.102.086808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2008] [Indexed: 05/27/2023]
Abstract
We report on the temperature dependence of acoustic-phonon-induced resistance oscillations in very-high mobility two-dimensional electron systems. We observe that the temperature dependence is nonmonotonic and that higher order oscillations are best developed at progressively lower temperatures. Our analysis shows that, in contrast with the Shubnikov-de Haas effect, phonon-induced resistance oscillations are sensitive to electron-electron interactions modifying the single particle lifetime.
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Affiliation(s)
- A T Hatke
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
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16
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Hatke AT, Zudov MA, Pfeiffer LN, West KW. Temperature dependence of microwave photoresistance in 2D electron systems. PHYSICAL REVIEW LETTERS 2009; 102:066804. [PMID: 19257620 DOI: 10.1103/physrevlett.102.066804] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2008] [Indexed: 05/27/2023]
Abstract
We report on the temperature dependence of microwave-induced resistance oscillations in high-mobility two-dimensional electron systems. We find that the oscillation amplitude decays exponentially with increasing temperature, as exp(-alphaT;{2}), where alpha scales with the inverse magnetic field. This observation indicates that the temperature dependence originates primarily from the modification of the single particle lifetime, which we attribute to electron-electron interaction effects.
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Affiliation(s)
- A T Hatke
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
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17
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Dorozhkin SI, Pechenezhskiy IV, Pfeiffer LN, West KW, Umansky V, von Klitzing K, Smet JH. Photocurrent and photovoltage oscillations in the two-dimensional electron system: enhancement and suppression of built-in electric fields. PHYSICAL REVIEW LETTERS 2009; 102:036602. [PMID: 19257376 DOI: 10.1103/physrevlett.102.036602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2008] [Indexed: 05/27/2023]
Abstract
We observe microwave-induced photocurrent and photovoltage oscillations around zero as a function of the applied magnetic field in high mobility GaAs 2D electron systems. The photosignals pass zero whenever the microwave frequency is close to a multiple of the cyclotron resonance frequency. They originate from built-in electric fields due to for instance band bending at contacts. The oscillations correspond to a suppression (screening) or an enhancement ("antiscreening") of these fields by the photoexcited electrons.
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Affiliation(s)
- S I Dorozhkin
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
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18
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Hatke AT, Chiang HS, Zudov MA, Pfeiffer LN, West KW. Microwave photoresistance in dc-driven 2D systems at cyclotron resonance subharmonics. PHYSICAL REVIEW LETTERS 2008; 101:246811. [PMID: 19113653 DOI: 10.1103/physrevlett.101.246811] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2008] [Indexed: 05/27/2023]
Abstract
We study microwave photoresistivity oscillations in a high-mobility two-dimensional electron system subject to strong dc electric fields. We find that near the second subharmonic of the cyclotron resonance the frequency of the resistivity oscillations with a dc electric field is twice the frequency of the oscillations at the cyclotron resonance, its harmonics, or in the absence of microwave radiation. This observation is discussed in terms of the microwave-induced sidebands in the density of states and the interplay between different scattering processes in the separated Landau level regime.
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Affiliation(s)
- A T Hatke
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
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19
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Smet JH, Gorshunov B, Jiang C, Pfeiffer L, West K, Umansky V, Umanksy V, Dressel M, Meisels R, Kuchar F, von Klitzing K. Circular-polarization-dependent study of the microwave photoconductivity in a two-dimensional electron system. PHYSICAL REVIEW LETTERS 2005; 95:116804. [PMID: 16197030 DOI: 10.1103/physrevlett.95.116804] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2005] [Indexed: 05/04/2023]
Abstract
The polarization dependence of the low field microwave photoconductivity and absorption of a two-dimensional electron system has been investigated in a quasioptical setup in which linear and any circular polarization can be produced in situ. The microwave induced resistance oscillations and the zero resistance regions are notably immune to the sense of circular polarization. This observation is discrepant with a number of proposed theories. Deviations between different polarizations occur only near the cyclotron resonance where an unprecedented large resistance response is observed.
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Affiliation(s)
- J H Smet
- Max-Planck-Institute für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
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20
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Auerbach A, Finkler I, Halperin BI, Yacoby A. Steady states of a microwave-irradiated quantum-Hall gas. PHYSICAL REVIEW LETTERS 2005; 94:196801. [PMID: 16090195 DOI: 10.1103/physrevlett.94.196801] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2005] [Indexed: 05/03/2023]
Abstract
We consider effects of a long-wavelength disorder potential on the zero conductance state (ZCS) of the microwave-irradiated 2D electron gas. Assuming a uniform Hall conductivity, we construct a Lyapunov functional and derive stability conditions on the domain structure of the photogenerated fields. We solve the resulting equations for a general one-dimensional and certain two-dimensional disorder potentials, and find nonzero conductances, photovoltages, and circulating dissipative currents. In contrast, weak white-noise disorder does not destroy the ZCS, but induces mesoscopic current fluctuations.
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Dmitriev IA, Mirlin AD, Polyakov DG. Cyclotron-resonance harmonics in the ac response of a 2D electron gas with smooth disorder. PHYSICAL REVIEW LETTERS 2003; 91:226802. [PMID: 14683262 DOI: 10.1103/physrevlett.91.226802] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2003] [Indexed: 05/24/2023]
Abstract
The frequency-dependent conductivity sigma(xx)(omega) of 2D electrons subjected to a transverse magnetic field and smooth disorder is calculated. The interplay of Landau quantization and disorder scattering gives rise to an oscillatory structure that survives in the high-temperature limit. The relation to recent experiments on photoconductivity by Zudov et al. and Mani et al. is discussed.
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Affiliation(s)
- I A Dmitriev
- Institut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany
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Lei XL, Liu SY. Radiation-induced magnetoresistance oscillation in a two-dimensional electron gas in Faraday geometry. PHYSICAL REVIEW LETTERS 2003; 91:226805. [PMID: 14683265 DOI: 10.1103/physrevlett.91.226805] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2003] [Indexed: 05/24/2023]
Abstract
Microwave-radiation induced giant magnetoresistance oscillations recently discovered in high-mobility two-dimensional electron systems are analyzed theoretically. Multiphoton-assisted impurity scatterings are shown to be the primary origin of the oscillation. Based on a theory which considers the interaction of electrons with electromagnetic fields and the effect of the cyclotron resonance in Faraday geometry, we are able not only to reproduce the correct period, phase, and the negative resistivity of the main oscillation, but also to predict the secondary peaks and additional maxima and minima observed in the experiments. These peak-valley structures are identified to relate, respectively, to single-, double-, and triple-photon processes.
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Affiliation(s)
- X L Lei
- Department of Physics, Shanghai Jiaotong University, 1954 Huashan Road, Shanghai 200030, China
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