Microwave-induced zero-resistance state in two-dimensional electron systems with unidirectional periodic modulation

Abstract

In this study we fabricated lateral superlattices (LSLs) based on the selectively doped GaAs/AlAs heterostructures with a high-mobility two-dimensional (2D) electron gas. The LSLs were formed using the electron-beam lithography and lift-off techniques, which produced a set of metallic strips on top of a heterojunction. The amplitude of the 2D electron gas modulation in the LSL was controlled by the gate voltage applied to the metallic strips. The LSLs with two different periods (a = 200 nm and 500 nm) were used to investigate the influence of microwave radiation with the frequency of 110–150 GHz on the 2D electron transport at the temperature T = 1.6 K in the magnetic field B < 1 T. We have found that zero-resistance states (ZRSs) appear under the microwave radiation in the 2D systems with a unidirectional periodic modulation. These ZRSs are located at the minima of commensurability oscillations.

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

“…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].…”

“…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].…”

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

“…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]. Consequently new materials have been studied [21][22][23][24] and new theoretical models have been put forward [25][26][27][28][29].…”

Microwave-Induced Magneto-Intersubband Scattering in a Square Lattice of Antidots

“…The period of these oscillations is determined by the ratio of the circular frequency ω of microwave radiation to the cyclotron frequency ωc = eB/m* (where B is the magnetic field and m* is the electron effective mass); for this reason, these resistance oscillations are often called ω/ωc oscillations. Recently, ω/ωc oscillations were observed in one-dimensional lateral superlattices [7,8]. It was shown in these studies that, much as in the case of a "shallow" triangular lattice of antidots [3], geometric commensurability resonances of the resistance and ω/ωc oscillations coexist.…”