Microwave-induced magnetotransport phenomena in two-dimensional electron systems: Importance of electrodynamic effects

Mikhaǐlov, S. A.

doi:10.1103/physrevb.70.165311

Cited by 133 publications

(109 citation statements)

References 49 publications

(101 reference statements)

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“…Active and inactive helicity interchange for negative magnetic fields (not shown). Note that the detected polarization behavior and the shape of transmittance minimum are well fitted by taking multiple reflections in the substrate and superradiant decay into account [47][48][49][50] (see solid lines in the inset of Fig. 1(a) and the Supplemental Material [35]).…”

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confidence: 99%

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Analog of microwave-induced resistance oscillations induced in GaAs heterostructures by terahertz radiation

et al. 2016

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We report on the study of terahertz radiation-induced MIRO-like oscillations of magnetoresistivity in GaAs heterostructures. Our experiments provide an answer on two most intriguing questions-effect of radiation helicity and the role of the edges-yielding crucial information for an understanding of the MIRO (microwave-induced resistance oscillations) origin. Moreover, we demonstrate that the range of materials exhibiting radiation-induced magneto-oscillations can be largely extended by using high-frequency radiation. DOI: 10.1103/PhysRevB.94.081301 One of the most interesting phenomena recently observed in two-dimensional electron systems (2DES) is microwave (MW) -induced resistance oscillations (MIRO) and associated zero resistance states (ZRS) [1][2][3][4][5][6][7], reviewed, e.g., in [8]. Like Shubnikov-de Haas oscillations (SdH), MIRO are periodic on a 1/B scale, but occur at lower magnetic fields and show much weaker temperature dependence. Phenomenologically, they are very similar to Weiss oscillations [9], which reflect the commensurability between the cyclotron orbit radius and the period of a periodic potential. MIRO by contrast, reflect the commensurability between the MW photon energy 2π f and the cyclotron energy ω c . In extremely clean samples the minima of the MIRO develop into ZRS [3][4][5], which are explained [10] in terms of an instability of the system and formation of current domains, occurring when the conductivity becomes negative under MW irradiation (see also [8,11,12]).In spite of numerous experiments and significant advances in their theoretical understanding, there is still no commonly accepted microscopic description of the effect [13,14] and the ongoing MIRO investigations remain challenging [15][16][17][18][19][20][21]. Consequently, new materials have been studied [22][23][24][25] and new theoretical models have been put forward [26][27][28][29][30]. To the most pressing issues which need to be clarified experimentally and which might help to differentiate between the different models belong the MIRO polarization dependence [7,8,31] and the "bulk" or "edge" nature of the effect.So far the majority of experimental work has been done in the MW regime (1-350 GHz) and there are only a few reports on MIRO excited at terahertz (THz) frequencies [32][33][34]. Here we report on the observation of pronounced MIRO-like oscillations induced by THz radiation. We exploit the specific advantages of THz laser radiation not present in the MW regime, i.e., the possibility to focus it onto a spot smaller than the sample's size and easy control of the radiation's polarization. The most important features clearly detected on a large variety of samples are (i) a very weak dependence of the oscillations' amplitude on the photon helicity and (ii) the bulk nature of the effect. Furthermore, our study shows that the MIRO oscillations can be excited at THz frequencies even in the samples with low mobility, whereas in the MW range ultrahigh mobility samples are crucially needed for this type of experimen...

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“…The former is dominated by the Hall part σ (±) xy (ω) of the dynamic conductivity and is described by the superradiant decay rate = e 2 n e /2ω 0 mc γ [47][48][49][50]. The effect of the dynamical screening is most simply expressed in the case of constructive Fabry-Perot interference [64]: the absorbance still has the form of Eq.…”

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Analog of microwave-induced resistance oscillations induced in GaAs heterostructures by terahertz radiation

et al. 2016

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“…(33)]. In high-electron mobility GaAs/AlGaAs quantum-well samples the radiative decay Γ par substantially exceeds the scattering rate γ, Γ par ≫ γ, and determines the linewidth of the cyclotron, plasmon, and magnetoplasmon resonances 67,68 . As the graphene mobility is also very high, one can expect that at high frequencies the radiative effects are more important in graphene than the scattering effects.…”

Section: Self-consistent-field Effects and Radiative Decaymentioning

confidence: 99%

Nonlinear electromagnetic response of graphene: frequency multiplication and the self-consistent-field effects

Mikhaǐlov

Ziegler²

2008

J. Phys.: Condens. Matter

391

390

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Graphene is a recently discovered carbon based material with unique physical properties. This is a monolayer of graphite, and the two-dimensional electrons and holes in it are described by the effective Dirac equation with a vanishing effective mass. As a consequence, electromagnetic response of graphene is predicted to be strongly non-linear. We develop a quasi-classical kinetic theory of the non-linear electromagnetic response of graphene, taking into account the self-consistent-field effects. Response of the system to both harmonic and pulse excitation is considered. The frequency multiplication effect, resulting from the non-linearity of the electromagnetic response, is studied under realistic experimental conditions. The frequency up-conversion efficiency is analysed as a function of the applied electric field and parameters of the samples. Possible applications of graphene in terahertz electronics are discussed.

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“…In view of the large conductivity of the 2DES, the radiation is mainly reflected near the resonance for the active circular polarization sense and the linewidth is not determined by the scattering rate. It is broadened orders of magnitude and this broadening has been referred to as saturation effect [35] or radiative decay [36]. Noteworthy is also the absence of discernible absorption signals at the harmonics of the cyclotron resonance frequency.…”

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Circular-Polarization-Dependent Study of the Microwave Photoconductivity in a Two-Dimensional Electron System

et al. 2005

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The polarization dependence of the low field microwave photoconductivity and absorption of a two-dimensional electron system has been investigated in a quasi-optical setup in which linear and any circular polarization can be produced in-situ. The microwave induced resistance oscillations and the zero resistance regions are notedly immune to the sense of circular polarization. This observation is discrepant with a number of proposed theories. Deviations only occur near the cyclotron resonance absorption where an unprecedented large resistance response is observed.PACS numbers: 73.21.-b, 73.43.-f The recent discovery of zero resistance induced by microwaves [1,2,3,4,5,6,7] in ultra-clean twodimensional electron systems (2DES) over extended regions of an applied perpendicular magnetic field B has revived the general interest in microwave photoconductivity and has triggered a remarkably large and diverse body of theoretical works. Original photoconductivity experiments on lower quality samples only revealed the intuitively expected feature due to resonant heating at the cyclotron resonance or more accurately -due to the finite size of the sample -at the combined dimensional plasmon cyclotron resonance frequency [8]. Unanticipated 1/B-periodic oscillations with minima close to the harmonics of the cyclotron resonance first entered the scene [9,10]. They later turned out precursors of the zero resistance regions. The majority of theoretical accounts subdivides the argumentation to explain the zero resistance into two main points. First some mechanism produces an oscillatory photoconductivity contribution that may turn the overall dissipative conductivity negative near the minima. Examples of proposed mechanisms include spatially indirect interLandau-level transitions based on impurity and phonon scattering [11,12,13,14,15,16,17,18,19], the establishement of a non-equilibrium distribution function [3,20,21,22], photon assisted quantum tunneling [23] and non-parabolicity effects [24]. Second, it is argued that negative values of the dissipative conductivity render the initially homogeneous system unstable [25,26] and an inhomogeneous domain structure develops instead [26, 27, 28, 29, 30], which results in zero resistance in experiment. Some theoretical work does not invoke an instability driven formation of domains to explain zero resistance. It relies either on radiation induced gaps in the electronic spectrum [31] or on the microwave driven semi-classical dynamics of electron orbits [32].The sheer multitude of models and their divergence underline that no consensus has been reached on the origin of this non-equilibrium phenomenon. In order to assist in isolating the proper microscopic picture, a detailed polarization dependent study was carried out. In previous work, microwaves were guided to the sample with oversized rectangular waveguides [1,2,3,4,5] or with a coaxial dipole antenna [6,7]. These approaches do not permit control over the polarization state. Rectangular waveguides operated in their fundamental mode...

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Microwave-induced magnetotransport phenomena in two-dimensional electron systems: Importance of electrodynamic effects

Cited by 133 publications

References 49 publications

Analog of microwave-induced resistance oscillations induced in GaAs heterostructures by terahertz radiation

Analog of microwave-induced resistance oscillations induced in GaAs heterostructures by terahertz radiation

Nonlinear electromagnetic response of graphene: frequency multiplication and the self-consistent-field effects

Circular-Polarization-Dependent Study of the Microwave Photoconductivity in a Two-Dimensional Electron System

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