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Friess B, Dmitriev IA, Umansky V, Pfeiffer L, West K, von Klitzing K, Smet JH. Acoustoelectric Study of Microwave-Induced Current Domains. PHYSICAL REVIEW LETTERS 2020; 124:117601. [PMID: 32242726 DOI: 10.1103/physrevlett.124.117601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Accepted: 12/24/2019] [Indexed: 06/11/2023]
Abstract
Surface acoustic waves (SAW) have been utilized to investigate the properties of a two-dimensional electron system subjected to a perpendicular magnetic field and monochromatic microwave radiation in the regime where the so-called microwave-induced zero-resistance states form. Contrary to conventional magnetotransport in Hall bar and van der Pauw geometries, the collimated SAW beam probes only the bulk of the electronic system exposed to this wave. Clear signatures appear in the SAW propagation velocity, corroborating that neither contacts nor sample edges are a root source for their emergence. By virtue of the directional nature of this probing method and with the assistance of theoretical modeling, we were able to demonstrate that the SAW response depends on the angle between its propagation vector and the orientation of domains that spontaneously form when zero-resistance is observed in transport. This confirms in unprecedented manner the formation of an inhomogeneous phase under these nonequilibrium conditions.
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Affiliation(s)
- B Friess
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
| | - I A Dmitriev
- Department of Physics, University of Regensburg, 93040 Regensburg, Germany
- Ioffe Physical Technical Institute, 194021 St. Petersburg, Russia
| | - V Umansky
- Braun Centre for Semiconductor Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - L Pfeiffer
- Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - K West
- Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - K von Klitzing
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
| | - J H Smet
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
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2
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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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3
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Liu HC, Reichl C, Wegscheider W, Mani RG. B-periodic oscillations in the Hall-resistance induced by a dc-current-bias under combined microwave-excitation and dc-current bias in the GaAs/AlGaAs 2D system. Sci Rep 2018; 8:7878. [PMID: 29777195 PMCID: PMC5959913 DOI: 10.1038/s41598-018-26009-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 04/30/2018] [Indexed: 11/09/2022] Open
Abstract
We report the observation of dc-current-bias-induced B-periodic Hall resistance oscillations and Hall plateaus in the GaAs/AlGaAs 2D system under combined microwave radiation- and dc bias excitation at liquid helium temperatures. The Hall resistance oscillations and plateaus appear together with concomitant oscillations also in the diagonal magnetoresistance. The periods of Hall and diagonal resistance oscillations are nearly identical, and source power (P) dependent measurements demonstrate sub-linear relationship of the oscillation amplitude with P over the span 0 < P ≤ 20 mW.
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Affiliation(s)
- Han-Chun Liu
- Department of Physics and Astronomy, Georgia State University, Atlanta, 30303, Georgia
| | - C Reichl
- Laboratorium für Festkörperphysik, ETH Zürich, Zürich, CH-8093, Switzerland
| | - W Wegscheider
- Laboratorium für Festkörperphysik, ETH Zürich, Zürich, CH-8093, Switzerland
| | - R G Mani
- Department of Physics and Astronomy, Georgia State University, Atlanta, 30303, Georgia.
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4
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Auerbach A, Arovas DP. Nonlinear Conductivity and Collective Charge Excitations in the Lowest Landau Level. PHYSICAL REVIEW LETTERS 2017; 119:016601. [PMID: 28731741 DOI: 10.1103/physrevlett.119.016601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Indexed: 06/07/2023]
Abstract
For weakly disordered fractional quantum Hall phases, the nonlinear photoconductivity is related to the charge susceptibility of the clean system by a Floquet boost. Thus, it may be possible to probe collective charge modes at finite wave vectors by electrical transport. Incompressible phases, irradiated at slightly above the magnetoroton gap, are predicted to exhibit negative photoconductivity and zero resistance states with spontaneous internal electric fields. Nonlinear conductivity can probe composite fermions' charge excitations in compressible filling factors.
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Affiliation(s)
| | - Daniel P Arovas
- Department of Physics, University of California at San Diego, La Jolla, California 92093, USA
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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, 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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7
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Mani RG, Kriisa A. Magneto-transport characteristics of a 2D electron system driven to negative magneto-conductivity by microwave photoexcitation. Sci Rep 2013; 3:3478. [PMID: 24327200 PMCID: PMC3858789 DOI: 10.1038/srep03478] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Accepted: 11/26/2013] [Indexed: 11/26/2022] Open
Abstract
Negative diagonal magneto-conductivity/resistivity is a spectacular- and thought provoking-property of driven, far-from-equilibrium, low dimensional electronic systems. The physical response of this exotic electronic state is not yet fully understood since it is rarely encountered in experiment. The microwave-radiation-induced zero-resistance state in the high mobility GaAs/AlGaAs 2D electron system is believed to be an example where negative magneto-conductivity/resistivity is responsible for the observed phenomena. Here, we examine the magneto-transport characteristics of this negative conductivity/resistivity state in the microwave photo-excited two-dimensional electron system (2DES) through a numerical solution of the associated boundary value problem. The results suggest, surprisingly, that a bare negative diagonal conductivity/resistivity state in the 2DES under photo-excitation should yield a positive diagonal resistance, with a concomitant sign reversal in the Hall voltage.
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Affiliation(s)
- R G Mani
- Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303
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8
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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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9
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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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10
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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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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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12
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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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13
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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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14
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Zhang W, Zudov MA, Pfeiffer LN, West KW. Resonant phonon scattering in quantum Hall systems driven by dc electric fields. PHYSICAL REVIEW LETTERS 2008; 100:036805. [PMID: 18233022 DOI: 10.1103/physrevlett.100.036805] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2007] [Indexed: 05/25/2023]
Abstract
Using dc excitation to spatially tilt Landau levels, we study resonant acoustic phonon scattering in two-dimensional electron systems. We observe that dc electric field strongly modifies phonon resonances, transforming resistance maxima into minima and back into maxima. Further, phonon resonances are enhanced dramatically in the nonlinear dc response and can be detected even at low temperatures. Most of our observations can be explained in terms of dc-induced (de)tuning of the resonant acoustic phonon scattering and its interplay with inter-Landau level impurity scattering. Finally, we observe a resistance maximum when the electron drift velocity approaches the speed of sound and a dc-induced zero-differential resistance state.
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Affiliation(s)
- W Zhang
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
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15
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Bykov AA, Zhang JQ, Vitkalov S, Kalagin AK, Bakarov AK. Zero-differential resistance state of two-dimensional electron systems in strong magnetic fields. PHYSICAL REVIEW LETTERS 2007; 99:116801. [PMID: 17930458 DOI: 10.1103/physrevlett.99.116801] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2007] [Indexed: 05/25/2023]
Abstract
We report the observation of a zero-differential resistance state (ZDRS) in response to a direct current above a threshold value I>I th applied to a two-dimensional system of electrons at low temperatures in a strong magnetic field. Entry into the ZDRS, which is not observable above several Kelvins, is accompanied by a sharp dip in the differential resistance. Additional analysis reveals an instability of the electrons for I>I th and an inhomogeneous, nonstationary pattern of the electric current. We suggest that the dominant mechanism leading to the new electron state is a redistribution of electrons in energy space induced by the direct current.
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Affiliation(s)
- A A Bykov
- Physics Department, City College of the City University of New York, New York 10031, USA
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Zhang W, Zudov MA, Pfeiffer LN, West KW. Resistance oscillations in two-dimensional electron systems induced by both ac and dc fields. PHYSICAL REVIEW LETTERS 2007; 98:106804. [PMID: 17358556 DOI: 10.1103/physrevlett.98.106804] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2006] [Indexed: 05/14/2023]
Abstract
We report on magnetotransport measurements in a high-mobility two-dimensional electron system subject simultaneously to ac (microwave) and dc (Hall) fields. We find that dc excitation affects microwave photoresistance in a nontrivial way. Photoresistance maxima (minima) evolve into minima (maxima) and back, reflecting strong coupling and interplay of ac- and dc-induced effects. Most of our observations can be explained in terms of indirect electron transitions using a new, combined resonant condition. Observed quenching of microwave-induced zero resistance by a dc field cannot be unambiguously linked to a domain model, at least before a systematic theory treating both excitation types within a single framework is developed.
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Affiliation(s)
- W Zhang
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
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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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