Terahertz radiation-induced magnetoresistance oscillations of a high-density and high-mobility two-dimensional electron gas

Квон, З. Д.; Козлов, Д. А.; Danilov, Sergey; Zoth, C.; Vierling, P.; Stachel, Sebastian; Belkov, Vassilij; Bakarov, A. K.; Дмитриев, Д. В.; Toropov, A. I.; Ganichev, Sergey

doi:10.1134/s0021364013010049

Cited by 17 publications

(10 citation statements)

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“…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.…”

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confidence: 81%

“…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.…”

mentioning

confidence: 81%

“…While THz MIRO oscillations have been observed in Hall bar samples [33], in this work we used Corbino disk samples, which measure directly σ xx . The inner, r i , and the outer, r o , radius of the gold-germanium contacts and samples' transport parameters are given in Table I (see also 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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Analog of microwave-induced resistance oscillations induced in GaAs heterostructures by terahertz radiation

et al. 2016

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“…So far the majority of experimental work in this direction has been done in the MW regime and there are only a few reports on MIRO excited at terahertz (THz) frequencies [30][31][32]. Here we report on the observation of pronounced MIRO-like oscillations induced by THz radiation, i.e.…”

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confidence: 88%

MIRO-like oscillations of magneto-resistivity in GaAs heterostructures induced by THz radiation

Herrmann¹,

Дмитриев²,

Козлов³

et al. 2016

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We report on the study of terahertz radiation induced MIRO-like oscillations of magneto-resistivity in GaAs heterostructures. Our experiments provide an answer on two most intriguing questionseffect of radiation helicity and the role of the edges -yielding crucial information for understanding of the MIRO origin. Moreover, we demonstrate that the range of materials exhibiting radiationinduced magneto-oscillations can be largely extended by using high-frequency radiation. ǫ /A CRI ǫ can only increase, see Suppl. Material.

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“…Then, we study two new effects experimentally obtained with TH, first the observed disappearance of the SdHO oscillations simultaneously with the vanishing resistance on the zero resistance region 37,38 . And secondly the strong modulation of the SdHO oscillations at sufficient TH radiation power 35,39 . The theoretical contribution of this paper is based on the radiationdriven electron orbits model [19][20][21] .…”

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Terahertz-induced resistance oscillations in high mobility two-dimensional electron systems

Iñarrea¹

2016

Preprint

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We report on a theoretical work on magnetotransport under terahertz radiation with high mobility two-dimensional electron systems. We focus on the interaction between the obtained radiationinduced magnetoresistance oscillations (RIRO) and the Shubnikov-de Haas (SdHO) oscillations. We study two effects experimentally obtained with this radiation. First, the observed disappearance of the SdHO oscillations simultaneously with the vanishing resistance at the zero resistance states region. And secondly the strong modulation of the SdHO oscillations at sufficient terahertz radiation power. We conclude that both effects share the same physical origin, the interference between the average advanced distance by the scattered electron between irradiated Landau states, (RIRO), and the available initial density of states at a certain magnetic field, (SdHO). Thus, from a physical standpoint, what the terahertz experiments and theoretical simulations reveal is, on the one hand, the oscillating nature of the Landau states subjected to radiation and, on the other hand, how they behave in the presence of scattering.

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Terahertz radiation-induced magnetoresistance oscillations of a high-density and high-mobility two-dimensional electron gas

Cited by 17 publications

References 15 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

MIRO-like oscillations of magneto-resistivity in GaAs heterostructures induced by THz radiation

Terahertz-induced resistance oscillations in high mobility two-dimensional electron systems

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