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Counterflow of electrons in two isolated quantum point contacts | V.S. Khrapai
; S. Ludwig
; J.P. Kotthaus
; H.P. Tranitz
; W. Wegscheider
; | Date: |
2 Apr 2007 | Subject: | cond-mat.mes-hall (Mesoscopic Systems and Quantum Hall Effect) | Abstract: | We study the interaction between two adjacent but electrically isolated
quantum point contacts (QPCs). At high enough source-drain bias on one QPC, the
drive-QPC, we detect a finite electric current in the second, unbiased,
detector-QPC. The current generated at the detector-QPC always flows in the
opposite direction than the current of the drive-QPC. The generated current is
maximal, if the detector-QPC is tuned to a transition region between its
quantized conductance plateaus and the drive-QPC is almost pinched-off. We
interpret this counterflow phenomenon in terms of an asymmetric phonon-induced
excitation of electrons in the leads of the detector-QPC. | Source: | arXiv, arxiv.0704.0132 | Services: | Forum | Review | PDF | Favorites |
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