Abstract
The phonon-drag thermopower of a quasi-one-dimensional ballistic quantum wire is calculated by using the Onsager relation to relate to the phonon-drag contribution to where is the heat flux produced by a small voltage difference across the wire. A general formula is derived for and numerical results are presented for when two electronic subbands are involved. The dependence of on the wire width exhibits peaks similar to those shown by the diffusion thermopower It is found, however, that the maxima are up to 50–100 times larger than the corresponding ones for when K. The dominance of is apparent for all the values of the wire width and temperatures investigated.
- Received 19 June 1997
DOI:https://doi.org/10.1103/PhysRevB.56.R10044
©1997 American Physical Society