Temperature Dependence of the Electronic Coherence of GaAs-GaAlAs Superlattices


We have shown that the coherence length of electrons in a 55-Å-period GaAs-GaAlAs superlattice does not depend strongly on temperature in the range 5–292 K, varying from 17 periods at 5 K to a minimum of nine periods at room temperature. The quantum coherence was determined by photocurrent spectroscopy experiments that exploit the formation of Stark ladders in superlattices under electric fields.

Appl. Phys. Lett. 56, 2545 (1990)