Polaron pinning effects in superlattices at high electric and magnetic fields

Current–voltage characteristics of GaAs/AlAs superlattices have been measured using long-pulsed magnetic fields up to 37 T applied parallel to the growth axis. In the region of Wannier–Stark localisation a combined Wannier–Stark Landau ladder of states is obtained and a number of resonant features c...

Full description

Saved in:
Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1998-12, Vol.256-258, p.540-543, Article 540
Main Authors: Hayden, R.K., Nogaret, A., Eaves, L., Miura, N., Henini, M.
Format: Article
Language:English
Subjects:
GaAs/AlAs
Hopping
Superlattice
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Current–voltage characteristics of GaAs/AlAs superlattices have been measured using long-pulsed magnetic fields up to 37 T applied parallel to the growth axis. In the region of Wannier–Stark localisation a combined Wannier–Stark Landau ladder of states is obtained and a number of resonant features corresponding to inter-well transitions are observed. At low magnetic fields, their voltage positions increase with magnetic field. However at magnetic fields above about 18 T, their voltage positions become independent of magnetic field owing to a pinning effect associated with polaronic coupling to the longitudinal-optic phonon mode.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(98)00536-5