科研之友
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摘要
Manifestations of fluctuating Cooper pairs formed by electrons and holes populating opposite surfaces of a topological insulator film in the Coulomb drag effect are considered. A fluctuational Aslamazov-Larkin contribution to the transresistance between surfaces of the film is calculated. The contribution is the most singular one in the vicinity of critical temperature T-d and diverges in the critical manner as (T - T-d)(-1). In the realistic conditions gamma similar to T-d, where gamma is the average scattering rate of electrons and holes, the Aslamazov-Larkin contribution plays an important role and can dominate the fluctuation transport. The macroscopic theory based on the time-dependent Ginzburg-Landau equation is developed for a description of the transport in the system. The results can be easily generalized for other realizations of an electron-hole bilayer.
- 出版日期2013-12-17
