Abstract
A quantum dot molecule doped with a single electron in the presence of diagonal and off-diagonal carrier-phonon couplings is studied by means of a nonperturbative quantum kinetic theory. The interaction with acoustic phonons by deformation potential and piezoelectric coupling is taken into account. We show that the phonon-mediated relaxation is fast on a picosecond time scale and is dominated by the usually neglected off-diagonal coupling to the lattice degrees of freedom leading to phonon-assisted electron tunneling. We show that in the parameter regime of current electrical and optical experiments, the microscopic non-Markovian theory has to be employed.
| Original language | English |
|---|---|
| Journal | Physical Review B Condensed Matter |
| Volume | 81 |
| Issue number | 11 |
| Pages (from-to) | 115305 |
| Number of pages | 5 |
| ISSN | 0163-1829 |
| DOIs | |
| Publication status | Published - 4 Mar 2010 |