Excess conductance of a spin-filtering quantum dot
| dc.creator | Beenakker, C. W. J. | |
| dc.date | 2006-01-27 | |
| dc.date.accessioned | 2026-07-07T06:57:49Z | |
| dc.date.available | 2026-07-07T06:57:49Z | |
| dc.description | The conductance G of a pair of single-channel point contacts in series, one of which is a spin filter, increases from 1/2 to 2/3 x e^2/h with more and more spin-flip scattering. This excess conductance was observed in a quantum dot by Zumbuhl et al., and proposed as a measure for the spin relaxation time T_1. Here we present a quantum mechanical theory for the effect in a chaotic quantum dot (mean level spacing Delta, dephasing time tau_phi, charging energy e^2/C), in order to answer the question whether T_1 can be determined independently of tau_phi and C. We find that this is possible in a time-reversal-symmetry-breaking magnetic field, when the average conductance follows closely the formula <G>=(2e^2/h)(T_1+h/Delta)/(4T_1+3h/Delta). | |
| dc.description | 4 pages, 2 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0601638 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0601638 | |
| dc.identifier | Phys. Rev. B 73, 201304(R) (2006) | |
| dc.identifier | doi:10.1103/PhysRevB.73.201304 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/107115 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Excess conductance of a spin-filtering quantum dot | |
| dc.type | text |