THz Magneto-photoresponse of an InAs-based quantum point contact in the region of cyclotron resonance

20th International Conference on the Application of High Magnetic Fields in Semiconductor Physics

Pakmehr, M.^1 ; Whiteside, V.R.^1 ; Bhandari, N.^2 ; Newrock, R.^3 ; Cahay, M.^2 ; McCombe, B.D.^1

Department of Physics, University at Buffalo, State University of New York, Buffalo, NY 14260, United States^1

Department of Electrical Engineering, University of Cincinnati, Cincinnati, OH 45221, United States^2

Department of Physics, University of Cincinnati, Cincinnati, OH 45221, United States^3

关键词: Carrier heating;    Effective mass;    InAs quantum well;    Photoresponses;    Quantum oscillations;    Quantum point contact;    Shubnikov de-Haas oscillation;    Spin splittings;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/456/1/012031/pdf
DOI  :  10.1088/1742-6596/456/1/012031

来源: IOP

【 摘 要 】

We have studied the THz magneto-photoresponse of a 2DEG in an InAs quantum well with an embedded Quantum Point Contact in the frequency/field region where electron cyclotron resonance (CR) dominates the response. The photoresponse near CR is manifested as an envelope of the amplitude of the Shubnikov-de Haas oscillations of the 2DEG with a peak near the CR field. Clear spin-splitting of the quantum oscillations is observed for B > 4 T. Data were simulated by a model of resonant carrier heating, and from the simulations the carrier density, the CR effective mass, scattering times and the g-factor were obtained. We find a significantly enhanced g-factor apparently due to exchange interaction.