Influence of microwave photo-excitation on the transport properties of the high mobility GaAs/AlGaAs 2D electron system
- PDF / 1,624,127 Bytes
- 6 Pages / 432 x 648 pts Page_size
- 78 Downloads / 186 Views
MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.30
Influence of microwave photo-excitation on the transport properties of the high mobility GaAs/AlGaAs 2D electron system T. R. Nanayakkara1, R. L. Samaraweera1, A. Kriisa1, U. Kushan Wijewardena1, S. Withanage1, C. Reichl2, W. Wegscheider2, R. G. Mani*,1 1 Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
2 Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland
* Corresponding author: [email protected]
ABSTRACT We examined the influence of the microwave power on the diagonal resistance in the GaAs/AlGaAs two dimensional electron system (2DES), in order to extract the electron temperature and determine microwave induced heating as a function of the microwave power. The study shows that microwaves produce a small discernable increase in the electron temperature both at null magnetic field and at finite magnetic fields in the GaAs/AlGaAs 2DES. The heating effect at null field appears greater in comparison to the examined finite field interval, although the increase in the electron temperature in the zero-field limit appears smaller than theoretical predictions.
INTRODUCTION Photoexciting a 2D electron system at liquid helium temperatures in the presence of a weak perpendicular magnetic field can produce a vanishing resistance state [1-3]. Such radiation-induced zero-resistance states and associated magnetoresistance oscillations have been a topic of interest in the study of transport in low dimensional systems [1-28]. Radiation- induced magnetoresistance oscillations in a high quality 2DES show periodicity with the inverse magnetic field, with 1/4 circle shifted extrema with respect to cyclotron resonance and their harmonics [1]. At the lowest temperatures and modest microwave intensity, the oscillatory minima evolve into zero resistance states. The 1/4 circle phase shift, the non-linear behavior of the microwave induced oscillation amplitude with
Downloaded from https://www.cambridge.org/core. Uppsala Universitetsbibliotek, on 26 Jan 2020 at 05:20:55, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2020.30
microwave power [8,14], correlation between the magnetoresistance oscillation and microwave reflection from 2DES [15], polarization dependency [7-8,16-17], and magnetoresistance oscillation under bichromatic photo-excitation [18-20] are other interesting experimental observations in this field. Some of these experimental observations have been examined by displacement model [21], the microwave driven electron orbital model [22], the inelastic model [23], memory effect theory [24], and synchronization theory [25]. A balance equation model applied to nonlinear magneto transport, which covers both separated and overlapping Landau-level regimes, and takes full account of multi photon assisted electron transition between various states, as well as role of electron temperature is of special interest for this study
Data Loading...
