Mesoscopic Fluctuations of Coulomb Drag of Composite Fermions
A. S. Price (1), A. K. Savchenko (1), D. A. Ritchie (2) ((1) School of, Physics, University of Exeter, Exeter EX4 4QL, UK, (2) Cavendish Laboratory,, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK)
TL;DR
This paper experimentally investigates mesoscopic fluctuations of Coulomb drag in a two-layer composite fermion system, revealing how these fluctuations influence the average drag and identifying the main dephasing mechanism through temperature variation.
Contribution
First experimental observation of mesoscopic Coulomb drag fluctuations in composite fermion systems and analysis of their temperature dependence.
Findings
Fluctuations cause alternating sign of average drag.
Temperature dependence reveals the dominant dephasing mechanism.
Mesoscopic fluctuations are significant in composite fermion Coulomb drag.
Abstract
We present the first experimental study of mesoscopic fluctuations of Coulomb drag in a system with two layers of composite fermions, which are seen when either the magnetic field or carrier concentration are varied. These fluctuations cause an alternating sign of the average drag. We study these fluctuations at different temperatures to establish the dominant dephasing mechanism of composite fermions.
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