Accession Number:

ADA209857

Title:

Effect of an Electric Field on a Split Bloch Band

Descriptive Note:

Technical rept.

Corporate Author:

CALIFORNIA UNIV SANTA BARBARA DEPT OF PHYSICS

Personal Author(s):

Report Date:

1989-06-21

Pagination or Media Count:

47.0

Abstract:

The effect of a constant and uniform electric field on a split Bloch band is studied through a tight binding model. The Wannier-Stark ladders of the parent band is modified by a potential in addition to that of the crystal. The frequency spectrum behaves as the field strength varies from weak to strong. In the case that the parent band is split into a finite number of sub-bands, there exists a set of subspaces to which the states return periodically in time, and that the constituent states of each subspace are localized around a given unit cell. A theoretical framework is developed which naturally exploits the symmetries of the system, and which allows for easy and clean numerical calculations.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE