Nonequilibrium mesoscopic conductance fluctuations

Details Nonequilibrium mesoscopic conductance fluctuations Nonequilibrium mesoscopic conductance fluctuations

2004-06-02

arxiv.org/abs/cond-mat/0406063v2

PRB 70, 235315 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 4 figures. Fig.2 and one more appendix added, accepted for publication in PRB

Scientific paper

10.1103/PhysRevB.70.235315

We investigate the amplitude of mesoscopic fluctuations of the differential conductance of a metallic wire at arbitrary bias voltage V. For non-interacting electrons, the variance increases with V. The asymptotic large-V behavior is \sim V/V_c (where eV_c=D/L^2 is the Thouless energy), in agreement with the earlier prediction by Larkin and Khmelnitskii. We find, however, that this asymptotics has a very small numerical prefactor and sets in at very large V/V_c only, which strongly complicates its experimental observation. This high-voltage behavior is preceded by a crossover regime, V/V_c \lesssim 30, where the conductance variance increases by a factor \sim 3 as compared to its value in the regime of universal conductance fluctuations (i.e., at V->0). We further analyze the effect of dephasing due to the electron-electron scattering on at high voltages. With the Coulomb interaction taken into account, the amplitude of conductance fluctuations becomes a non-monotonic function of V. Specifically, drops as 1/V for voltages V >> gV_c, where g is the dimensionless conductance. In this regime, the conductance fluctuations are dominated by quantum-coherent regions of the wire adjacent to the reservoirs.

Affiliated with

Also associated with

No associations

Rating

Nonequilibrium mesoscopic conductance fluctuations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Nonequilibrium mesoscopic conductance fluctuations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonequilibrium mesoscopic conductance fluctuations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-617860