Thermally activated intersubband scattering and oscillating magnetoresistance in quantum wells

Details Thermally activated intersubband scattering and oscillating magnetoresistance in quantum wells Thermally activated intersubband scattering and oscillating magnetoresistance in quantum wells

2010-10-28

arxiv.org/abs/1010.6080v1

Physical Review B 82, 165333 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 5 figures

Scientific paper

10.1103/PhysRevB.82.165333

Experimental studies of magnetoresistance in high-mobility wide quantum wells reveal oscillations which appear with an increase in temperature to 10 K and whose period is close to that of Shubnikov-de Haas oscillations. The observed phenomenon is identified as magnetointersubband oscillations caused by the scattering of electrons between two occupied subbands and the third subband which becomes occupied as a result of thermal activation. These small-period oscillations are less sensitive to thermal suppression than the largeperiod magnetointersubband oscillations caused by the scattering between the first and the second subbands. Theoretical study, based on consideration of electron scattering near the edge of the third subband, gives a reasonable explanation of our experimental findings.

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