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Spin resonance without spin splitting

Hell, M.; Sothmann, B.; Leijnse, Martin LU ; Wegewijs, M. R. and Koenig, J. (2015) In Physical Review B (Condensed Matter and Materials Physics) 91(19).
Abstract
We predict that a single-level quantum dot without discernible splitting of its spin states develops a spin-precession resonance in charge transport when embedded into a spin valve. The resonance occurs in the generic situation of Coulomb blockaded transport with ferromagnetic leads whose polarizations deviate from perfect antiparallel alignment. The resonance appears when electrically tuning the interaction-induced exchange field perpendicular to one of the polarizations-a simple condition relying on vectors in contrast to usual resonance conditions associated with energy splittings. The spin resonance can be detected by stationary dI/dV spectroscopy and by oscillations in the time-averaged current using a gate-pulsing scheme. The generic... (More)
We predict that a single-level quantum dot without discernible splitting of its spin states develops a spin-precession resonance in charge transport when embedded into a spin valve. The resonance occurs in the generic situation of Coulomb blockaded transport with ferromagnetic leads whose polarizations deviate from perfect antiparallel alignment. The resonance appears when electrically tuning the interaction-induced exchange field perpendicular to one of the polarizations-a simple condition relying on vectors in contrast to usual resonance conditions associated with energy splittings. The spin resonance can be detected by stationary dI/dV spectroscopy and by oscillations in the time-averaged current using a gate-pulsing scheme. The generic noncollinearity of the ferromagnets and junction asymmetry allow for an all-electric determination of the spin-injection asymmetry, the anisotropy of spin relaxation, and the magnitude of the exchange field. We also investigate the impact of a nearby superconductor on the resonance position. Our simplistic model turns out to be generic for a broad class of coherent few-level quantum systems. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
91
issue
19
publisher
American Physical Society
external identifiers
  • wos:000353966300006
  • scopus:84930206085
ISSN
1098-0121
DOI
10.1103/PhysRevB.91.195404
language
English
LU publication?
yes
id
c05bb793-c841-49d4-b5dd-9f528ea1fbd0 (old id 7432315)
date added to LUP
2015-06-25 12:22:01
date last changed
2017-03-12 03:42:32
@article{c05bb793-c841-49d4-b5dd-9f528ea1fbd0,
  abstract     = {We predict that a single-level quantum dot without discernible splitting of its spin states develops a spin-precession resonance in charge transport when embedded into a spin valve. The resonance occurs in the generic situation of Coulomb blockaded transport with ferromagnetic leads whose polarizations deviate from perfect antiparallel alignment. The resonance appears when electrically tuning the interaction-induced exchange field perpendicular to one of the polarizations-a simple condition relying on vectors in contrast to usual resonance conditions associated with energy splittings. The spin resonance can be detected by stationary dI/dV spectroscopy and by oscillations in the time-averaged current using a gate-pulsing scheme. The generic noncollinearity of the ferromagnets and junction asymmetry allow for an all-electric determination of the spin-injection asymmetry, the anisotropy of spin relaxation, and the magnitude of the exchange field. We also investigate the impact of a nearby superconductor on the resonance position. Our simplistic model turns out to be generic for a broad class of coherent few-level quantum systems.},
  articleno    = {195404},
  author       = {Hell, M. and Sothmann, B. and Leijnse, Martin and Wegewijs, M. R. and Koenig, J.},
  issn         = {1098-0121},
  language     = {eng},
  number       = {19},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Spin resonance without spin splitting},
  url          = {http://dx.doi.org/10.1103/PhysRevB.91.195404},
  volume       = {91},
  year         = {2015},
}