Fine structure of high-power microwave-induced resistance oscillations

Shi, Q.; Zudov, M. A.; Дмитриев, И. А.; Baldwin, K. W.; Pfeiffer, Loren; West, Kenneth D.

doi:10.1103/physrevb.95.041403

Cited by 17 publications

(17 citation statements)

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“…In other words, the shape and phase of MIRO are found to be insensitive to I, following ∆σ osc ∝ − sin(2πǫ). As mentioned above, this behavior is qualitatively different from the nonlinear effects in the microwave range, where higher microwave power leads to emergence of additional minima and maxima [35][36][37][38][39][40][41][42] , or, at moderate power, to a shift of minima and maxima to the neighboring nodes at integer ǫ [43][44][45] . The drastic differences between the high-power THz and microwave responses suggest distinct mechanisms of the nonlinearity.…”

Section: Discussionmentioning

confidence: 83%

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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Section: Discussionmentioning

confidence: 83%

Magnetoresistance oscillations induced by high-intensity terahertz radiation

et al. 2017

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“…The latter would rather produce a significant reduction of the MIRO phase and it can even lead to the emergence of additional oscillatory structure around integer . 25,40,41 The magnitude of the CR peak in panel (b) shows sublinear growth for power up to the highest available output. At small power, it becomes difficult to isolate the CR peak from the background signal, so, unlike MIRO in panel (a), no clear transition to the linear regime could be identified in this case.…”

Section: Discussionmentioning

confidence: 99%

Microwave response of interacting oxide two-dimensional electron systems

Tabrea,

Dmitriev,

Dorozhkin

et al. 2020

Preprint

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We present an experimental study on microwave illuminated high mobility MgZnO/ZnO based two-dimensional electron systems with different electron densities and, hence, varying Coulomb interaction strength. The photoresponse of the low-temperature dc resistance in perpendicular magnetic field is examined in low and high density samples over a broad range of illumination frequencies. In low density samples a response due to cyclotron resonance (CR) absorption dominates, while highdensity samples exhibit pronounced microwave-induced resistance oscillations (MIRO). Microwave transmission experiments serve as a complementary means of detecting the CR over the entire range of electron densities and as a reference for the band mass unrenormalized by interactions. Both CR and MIRO-associated features in the resistance permit extraction of the effective mass of electrons but yield two distinct values. The conventional cyclotron mass representing center-of-mass dynamics exhibits no change with density and coincides with the band electron mass of bulk ZnO, while MIRO mass reveals a systematic increase with lowering electron density consistent with renormalization expected in interacting Fermi liquids.

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“…This suggests that both the transition to the sublinear growth and subsequent decay of MIRO with increasing microwave power are due to heating [40], and not due to intrinsic nonlinear effects. The later would rather produce a significant reduction of the MIRO phase and it can even lead to the emergence of additional oscillatory structure around integer [26,41,42]. The magnitude of the CR peak in Fig.…”

Section: Appendix B: Power Dependence Of the Microwave Responsementioning

confidence: 95%

Microwave response of interacting oxide two-dimensional electron systems

et al. 2020

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We present an experimental study on microwave illuminated high mobility MgZnO/ZnO based twodimensional electron systems with different electron densities and, hence, varying Coulomb interaction strength. The photoresponse of the low-temperature dc resistance in perpendicular magnetic field is examined in low and high density samples over a broad range of illumination frequencies. In low density samples a response due to cyclotron resonance (CR) absorption dominates, while high-density samples exhibit pronounced microwaveinduced resistance oscillations (MIRO). Microwave transmission experiments serve as a complementary means of detecting the CR over the entire range of electron densities and as a reference for the band mass unrenormalized by interactions. Both CR and MIRO-associated features in the resistance permit extraction of the effective mass of electrons but yield two distinct values. The conventional cyclotron mass representing center-of-mass dynamics exhibits no change with density and coincides with the band electron mass of bulk ZnO, while MIRO mass reveals a systematic increase with lowering electron density consistent with renormalization expected in interacting Fermi liquids.

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Fine structure of high-power microwave-induced resistance oscillations

Cited by 17 publications

References 50 publications

Magnetoresistance oscillations induced by high-intensity terahertz radiation

Magnetoresistance oscillations induced by high-intensity terahertz radiation

Microwave response of interacting oxide two-dimensional electron systems

Microwave response of interacting oxide two-dimensional electron systems

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