Failure of the Wiedemann-Franz law in mesoscopic conductors | |
Article | |
关键词: DISORDERED CONDUCTORS; FLUCTUATIONS; COEFFICIENTS; TEMPERATURE; THERMOPOWER; TRANSPORT; METALS; RINGS; | |
DOI : 10.1103/PhysRevB.72.205107 | |
来源: SCIE |
【 摘 要 】
We study the effect of mesoscopic fluctuations on the validity of the Wiedemannn-Franz (WF) law for quasi-one-dimensional metal wires and open quantum dots. At temperatures much less than the generalized Thouless energy, E-c, the WF law is satisfied for each specific sample, but as the temperature is raised through E-c, a sample-specific correction to the WF law of order 1/g appears (g is the dimensionless conductance) and then tends to zero again at k(B)T >> E-c. The mesoscopic violation of the Weidemann-Franz law is even more pronounced in a ring geometry for which the Lorenz number exhibits h/e flux-periodic Aharonov-Bohm oscillations.
【 授权许可】
Free