arXiv:1011.4559 [cond-mat.mes-hall]AbstractReferencesReviewsResources
Thermal Enhancement of Interference Effects in Quantum Point Contacts
Adel Abbout, Gabriel Lemarié, Jean-Louis Pichard
Published 2010-11-20Version 1
We study an electron interferometer formed with a quantum point contact and a scanning probe tip in a two-dimensional electron gas. The images giving the conductance as a function of the tip position exhibit fringes spaced by half the Fermi wavelength. For a contact opened at the edges of a quantized conductance plateau, the fringes are enhanced as the temperature T increases and can persist beyond the thermal length l_T. This unusual effect is explained assuming a simplified model: The fringes are mainly given by a contribution which vanishes when T -> 0 and has a decay characterized by a T-independent scale.
Journal: Phys. Rev. Lett. 106, 156810 (2011)
Categories: cond-mat.mes-hall
Keywords: quantum point contact, interference effects, thermal enhancement, two-dimensional electron gas, t-independent scale
Tags: journal article
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