Multiple and virtual photon processes in radiation-induced magnetoresistance oscillations in two-dimensional electron systems

Lei, X. L.; Liu, S. Y.

doi:10.1063/1.2207499

Cited by 22 publications

(27 citation statements)

References 42 publications

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“…These effects were extensively studied both experimentally [35][36][37][38][39] and theoretically 38,40,41 and generally require stronger magnetic field, ω c > τ…”

Section: Appendix C: Insignificance Of Intrinsic Nonlinear Effectsmentioning

confidence: 99%

Magnetoresistance oscillations induced by high-intensity terahertz radiation

et al. 2017

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We report on observation of pronounced terahertz radiation-induced magneto-resistivity oscillations in AlGaAs/GaAs two-dimensional electron systems, the THz analog of the microwave induced resistivity oscillations (MIRO). Applying high power radiation of a pulsed molecular laser we demonstrate that MIRO, so far observed at low power only, are not destroyed even at very high intensities. Experiments with radiation intensity ranging over five orders of magnitude from 0.1 W/cm 2 to 10 4 W/cm 2 reveal high-power saturation of the MIRO amplitude, which is well described by an empirical fit function I/(1 + I/Is) β with β ∼ 1. The saturation intensity Is is of the order of tens of W/cm 2 and increases by six times by increasing the radiation frequency from 0.6 to 1.1 THz. The results are discussed in terms of microscopic mechanisms of MIRO and compared to nonlinear effects observed earlier at significantly lower excitation frequencies.Magnetotransport experiments in low-dimensional systems containing high mobility two-dimensional electron gases (2DEG) reveal many fundamental phenomena of quite different physical nature. The most prominent and well-known examples in linear dc transport are integer and fractional quantum Hall effects 1,2 in stronger magnetic field and Shubnikov -de Haas (SdH) 3,4 and Weiss 5oscillations at moderate fields. While linear transport phenomena in low-dimensional semiconductor systems have been systematically studied for several decades, in the last years terahertz/microwave-induced nonequilibrium transport in 2DEG is attracting an ever growing attention. In part, this is caused by the steadily expanding frequency range and rapid developments of terahertz science and technology [6][7][8][9][10][11] . Following the discovery of the microwave-induced resistance oscillations (MIRO) 12,13 and associated zero-resistance states 14-18 , the focus of recent research has largely shifted to nonequilibrium magnetotransport phenomena 19 . Similar to the SdH and Weiss oscillations, MIRO are 1/B-periodic oscillations and reflect the commensurability between the photon energy 2π f and the cyclotron energy ω c . Here, is the reduced Planck constant, f the microwave frequency and ω c the cyclotron frequency. Very recently, it was demonstrated that MIRO can be efficiently excited at substantially higher frequencies of several terahertz 20 . This work gave an experimental answer to two currently most intriguing questions regarding radiation helicity 18 and the role of the contacts/edges 21,22 . So far all studies of MIRO were performed at low radiation power smaller or of the order of a milliwatt19 . Here we demonstrate that MIRO are very robust and do not vanish even at very high power up to tens of kW/cm 2 . We have studied MIRO for frequencies between 0.6 and 1.1 THz and intensities varying by five orders of magnitude. We observe that high radiation intensity affects exclusively the amplitude of MIRO while both shape and phase of the oscillations are preserved. For all frequencies and all oscillation orde...

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“…These effects were extensively studied both experimentally [35][36][37][38][39] and theoretically 38,40,41 and generally require stronger magnetic field, ω c > τ…”

Section: Appendix C: Insignificance Of Intrinsic Nonlinear Effectsmentioning

confidence: 99%

Magnetoresistance oscillations induced by high-intensity terahertz radiation

et al. 2017

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“…Initially, FMIRO were ascribed to multiphoton processes [95,99]. This expanation, however, failed to reproduce the observations [98], where the FMIRO only occured at ω below a certain threshold value.…”

Section: Inelastic Mechanism Of Miromentioning

confidence: 84%

“…In particular, in the limit of well separated LLs the FMIRO are dominated by multiphoton inelastic mechanism. Provided τ in /τ q ≫ 1, the multiphoton displacement mechanism [99] yields a parametrically smaller contribution and can be neglected. At weaker magnetic field the effects related to microwave-induced sidebands in the DOS become important.…”

Section: Inelastic Mechanism Of Miromentioning

confidence: 99%

“…Here, the FMIRO near combined resonances nω = mω c occured due to a resonant series of n single-photon transitions with real absorption (emission) of the microwave quanta [100], in distinction to the virtual multiphoton processes. A systematic theory of the FMIRO [101] has shown that the existing theories [99,100] miss several important contributions. In particular, in the limit of well separated LLs the FMIRO are dominated by multiphoton inelastic mechanism.…”

Section: Inelastic Mechanism Of Miromentioning

confidence: 99%

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Magnetotransport of electrons in quantum Hall systems

Дмитриев

Evers

Gornyi

et al. 2008

Physica Status Solidi (b)

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Recent theoretical results on magnetotransport of electrons in a 2D system in the range of moderately strong transverse magnetic fields are reviewed. The phenomena discussed include: quasiclassical memory effects in systems with various types of disorder, transport in lateral superlattices, interaction-induced quantum magnetoresistance, quantum magnetooscillations in dc and ac transport, and oscillatory microwave photoconductivity.

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“…(4). Similarly to the integer case, there exists [14] a multiphoton contribution to the fractional MIRO governed by the displacement mechanism [4,5,6], which has a similar form but is a factor ωcτin/τqΓ ≫ 1 smaller [16] than the inelastic one (7).…”

Section: Inelastic Multiphoton Mechanism Of the Fractional Miromentioning

confidence: 99%

Fractional microwave-induced resistance oscillations

Дмитриев

Mirlin

Polyakov

2008

Physica E: Low-dimensional Systems and Nanostructures

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We develop a systematic theory of microwave-induced oscillations in magnetoresistivity of a 2D electron gas in the vicinity of fractional harmonics of the cyclotron resonance, observed in recent experiments. We show that in the limit of well-separated Landau levels the effect is dominated by the multiphoton inelastic mechanism. At moderate magnetic field, two single-photon mechanisms become important. One of them is due to resonant series of multiple single-photon transitions, while the other originates from microwave-induced sidebands in the density of states of disorder-broadened Landau levels.

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Multiple and virtual photon processes in radiation-induced magnetoresistance oscillations in two-dimensional electron systems

Cited by 22 publications

References 42 publications

Magnetoresistance oscillations induced by high-intensity terahertz radiation

Magnetoresistance oscillations induced by high-intensity terahertz radiation

Magnetotransport of electrons in quantum Hall systems

Fractional microwave-induced resistance oscillations

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