Author(s): Mi, J (Mi, Jian); Zhang, L (Zhang, Long); Wang, JL (Wang, Jianli); Fallahi, S (Fallahi, Saeed); Gardner, GC (Gardner, Geoffrey C.); Manfra, MJ (Manfra, M. J.); Zhang, C (Zhang, Chi)

Source: PHYSICAL REVIEW B Volume: 101 Issue: 19 Article Number: 195306 DOI: 10.1103/PhysRevB.101.195306 Published: MAY 18 2020

Abstract: We report our direct study of the compressibility on an ultrahigh mobility two-dimensional electron system (mu(e) similar to 1x10(7) cm(2)/V s) in GaAs/AlGaAs quantum wells under microwave irradiation. The field penetration current results show that the quantum capacitance oscillates with microwave-induced resistance oscillations, however, the trend is opposite with respect to the compressibility of equilibrium states in previous theoretical explanations. The anomalous phenomena provide a platform for study on the nonequilibrium system under microwaves. Moreover, the quantum capacitance indication for a multiphoton process around j = 1/2 is detected under an intensive microwave below 30 GHz.

Accession Number: WOS:000533496000005

ISSN: 2469-9950

eISSN: 2469-9969

Full Text: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.101.195306