Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin resonance without spin splitting   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.

24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg