Effect of an in-plane magnetic field on microwave photoresistance and Shubnikov-de Haas effect in high-mobility GaAs/AlGaAs quantum wells

A Bogan,M A Zudov,L N Pfeiffer,A Sachrajda,K W West,A T Hatke,S A Studenikin

doi:10.1088/1742-6596/456/1/012004

Abstract

A recent study of the decay of microwave-induced resistance oscillations (MIRO) in GaAs/AlGaAs quantum wells due to an in-plane magnetic field B|| has revealed the dominant role of a quadratic-in-B|| correction to the quantum scattering rate. In the present study, we examine the evolution of Shubnikov-de Haas oscillations (SdHO) with increasing tilt angle in the same sample. Even though we find that the SdHO also diminish at high tilt angles, this decay is qualitatively different from that of MIRO, possibly indicating a different physical origin.

Highlights

Among a variety of transport phenomena [1,2,3,4,5,6,7,8,9,10,11,12,13,14] recently discovered in very high Landau levels of a high mobility two-dimensional electron gas (2DEG), microwave-induced resistance oscillations (MIRO) [1,2] and zero-resistance states [5,6] have received the most attention, both theoretically [15,16,17,18,19,20,21,22,23] and experimentally [24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41]
microwave-induced resistance oscillations (MIRO) are an attractive tool to study the dependence of the quantum lifetime on B, the understanding of which is important for other systems, such as lateral quantum dots [43]
A Dingle plot analysis performed on these data reveals a quantum lifetime τq0 = 21 ps, which is typical of a high mobility 2DEG

Summary

Introduction

Among a variety of transport phenomena [1,2,3,4,5,6,7,8,9,10,11,12,13,14] recently discovered in very high Landau levels of a high mobility two-dimensional electron gas (2DEG), microwave-induced resistance oscillations (MIRO) [1,2] and zero-resistance states [5,6] have received the most attention, both theoretically [15,16,17,18,19,20,21,22,23] and experimentally [24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41]. Published under licence by IOP Publishing Ltd f = 48.4 GHz we have revisited the issue [46] and found that the decay of the MIRO amplitude with increasing tilt angle can be understood in terms of a B -induced increase of the single particle scattering rate, which acquires a quadratic-in-B correction. SdHO decay with increasing tilt angle, but, in contrast to MIRO, the decay appears to be roughly the same for all filling factors studied.

Results

Conclusion