Nonlinear Conductance in the Mesoscopic Regime
Abstract
Fluctuations of the currentvoltage (IV) characteristic of a mesoscopic sample are considered. Such a sample can be realized as a junction of two normal metals. The voltage dependence of current is a random function, and the IVcharacteristic has a "blades of grass" form on a usual ohmic background. The scale of each "blade" in voltage is of order V_{c} ~ hbar/τ_{f}e, where τ_{f} is the time of flight through the junction and e is the electron charge. The scale in current δI depends on the voltage V and temperature T, and of order (e^{2}/hbar)(VV_{c})^{1/2}, if V gg V_{c}, T/e. As a result, provided the voltage is sufficiently large, there appear regions of negative differential resistance.
 Publication:

Physica Scripta Volume T
 Pub Date:
 January 1986
 DOI:
 10.1088/00318949/1986/T14/001
 Bibcode:
 1986PhST...14....4K