Magnetic field asymmetry of mesocopic dc rectification in Aharonov Bohm rings

Article Article scientifique Article Magnetic field asymmetry of mesocopic dc rectification in Aharonov Bohm rings eng 2007 author Angers Lionel author Zakka-Bajjani E. author Deblock R. author Gueron S. author Bouchiat H. author Cavanna A. author Gennser U. author Polyanskiy Mikhail 619937 115309 10.1103/PhysRevB.75.115309 1098-0121 cond-mat/0603303 Fundamental Casimir-Onsager symmetry rules for linear response do not apply to non linear transport. This motivates the investigation of nonlinear dc conductance of mesoscopic GaAs/GaAlAs rings in a 2 wire configuration. The second order current response to a potential bias is of particular interest. It is related to the sensitivity of conductance fluctuations to this bias and contains information on electron interactions not included in the linear response. In contrast with the linear response which is a symmetric function of magnetic field we find that this second order response exhibits a field dependence which contains an antisymmetric part. We analyse the flux periodic and aperiodic components of this asymmetry and find that they only depend on the conductance of the rings which is varied by more than an order of magnitude. These results are in good agreement with recent theoretical predictions relating this asymmetric response to the electron interactions. Dewey 500.2 arxiv cond-mat.mes-hall 37 Département de physique théorique 133 false Physical review. B, Condensed matter and materials physics 75 11 af317bc8-b47c-4919-bf03-c053ceb65a25 Article (Submitted version) Public cond-mat_0603303v2.pdf 252748 application/pdf 165dd4d2-dac3-457f-9ef1-40b25dd09fbc Article (Published version) Restricted unige_79123-ATTACHMENT01.pdf 497177 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique théorique

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Magnetic field asymmetry of mesocopic dc rectification in Aharonov Bohm rings	Physical review. B, Condensed matter and materials physics			2007	621	359

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Polyanskiy, Mikhail