Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-Orbital Superconductivity in SrTiO3 /LaAlO3 Interface and SrTiO3
  Surface   We investigate the superconductivity in two-dimensional electron systems
formed in SrTiO3 nanostructures. Our the- oretical analysis is based on the
three-orbital model, which takes into account t2g orbitals of Ti ions. Because
of the interfacial breaking of mirror symmetry, a Rashba-type antisymmetric
spin-orbit coupling arises from the cooperation of intersite and interorbital
hybridyzation and atomic LS coupling. This model shows a characteristic spin
texture and carrier density dependence of Rashba spin-orbit coupling through
the orbital degree of freedom. Superconductivity is mainly caused by heavy
quasiparticles consisting of dyz and dzx orbitals at high carrier densities. We
find that the Rashba spin-orbit coupling stabilizes a quasi-one-dimensional
superconducting phase caused by one of the dyz or dzx orbitals at high magnetic
fields along interfaces. This quasi-one-dimensional superconducting phase is
protected against para- magnetic depairing effects by the Rashba spin-orbit
coupling and realizes a large upper critical field Hc2 beyond the
Pauli-Clogston-Chandrasekhar limit. This finding is consistent with an
extraordinarily large upper critical field observed in SrTiO3 /LaAlO3
interfaces and its carrier density dependence. The possible coexistence of
superconductivity and fer- romagnetism in SrTiO3 /LaAlO3 interfaces may also be
attributed to this quasi-one-dimensional superconducting phase.

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The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
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The categories of this paper are: stat
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
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The categories of this paper are: nlin
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph