Microwave reflection study of ultra-high mobility GaAs/AlGaAs 2D-electron system at large filling factors

2014 ◽  
Vol 1635 ◽  
pp. 69-74
Author(s):  
Tianyu Ye ◽  
Ramesh Mani ◽  
Werner Wegscheider
Keyword(s):  
High Mobility ◽  
Electron System ◽  
Experimental Setup ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Transport Response ◽  
Dimensional Electron System ◽  
Microwave Detector ◽  
Microwave Reflection ◽  
Magnetoresistance Oscillations

ABSTRACTThe microwave-induced magnetoresistance oscillations are exhibited by the GaAs/AlGaAs two dimensional electron system (2DES) under microwave and terahertz photo-excitation at liquid helium temperatures. Such oscillations are presently understood in terms of various theories. In order to identify the relative physical contributions, we have concurrently examined magnetotransport and microwave reflection from the 2DES. For the reflection measurements, a sensitive microwave detector was assimilated into the standard experimental setup. Here, we correlate changes in reflection with the concurrent transport response of the photo-excited 2DES.

Microwave Reflection From The Microwave Photo-Excited High Mobility GaAs/AlGaAs Two-Dimensional Electron System

2013 ◽  
Vol 1617 ◽  
pp. 19-24
Author(s):  
Tianyu Ye ◽  
R. G. Mani ◽  
W. Wegscheider
Keyword(s):  
Microwave Power ◽  
High Mobility ◽  
Microwave Frequency ◽  
Electron System ◽  
Two Dimensional ◽  
Strong Correlations ◽  
Dimensional Electron ◽  
Dimensional Electron System ◽  
Microwave Reflection ◽  
Magnetoresistance Oscillations

ABSTRACTWe examine the microwave reflection from the high mobility GaAs/AlGaAs two-dimensional electron system (2DES). Strong correlations have been observed between the microwave induced magnetoresistance oscillations and the microwave reflection oscillations in a concurrent measurement of the microwave illuminated magnetoresistance and the microwave reflection from the 2DES. The correlations were followed as a function of the microwave frequency and the microwave power dependent. Different existing theories are considered to explain the results.

scholarly journals OSCILLATORY AND VANISHING RESISTANCE STATES IN MICROWAVE IRRADIATED 2D ELECTRON SYSTEMS

2004 ◽  
Vol 18 (27n29) ◽  
pp. 3465-3472 ◽  
Author(s):  
R. R. DU ◽  
M. A. ZUDOV ◽  
C. L. YANG ◽  
Z. Q. YUAN ◽  
L. N. PFEIFFER ◽  
...  
Keyword(s):  
High Frequency ◽  
High Mobility ◽  
Electron System ◽  
Two Dimensional ◽  
Electron Systems ◽  
Dimensional Electron ◽  
Dimensional Electron System ◽  
Zero Resistance ◽  
The Subject ◽  
Shubnikov De Haas Oscillations

Giant-amplitude oscillations in dc magnetoresistance of a high-mobility two-dimensional electron system can be induced by millimeterwave irradiations, leading to zero-resistance states at the oscillation minima. Following a brief overview of the now well-known phenomenon, this paper reports on aspects of more recent experiments on the subject. These are: new zero-resistance states associated with multi-photon processes; suppression of Shubnikov-de Haas oscillations by high-frequency microwaves; and microwave photoconductivity of a high-mobility two-dimensional hole system.

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