Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-valley half-metal as a prospective material for spin-valley-tronics   Half-metallicity (full spin polarization of the Fermi surface) usually occurs
in strongly correlated electron systems. We demonstrate that doping a
spin-density wave insulator in the weak-coupling regime may also stabilize
half-metallic states. The undoped spin-density wave is formed by four nested
bands [i.e., each band is characterized by charge (electron/hole) and spin
(up/down) labels]. Of these four bands only two accumulate the doped carriers,
forming a half-metallic two-valley Fermi surface. Depending on parameters, the
spin polarizations of the electron-like and hole-like valleys may be (i)
parallel or (ii) antiparallel. The Fermi surface of (i) is fully spin-polarized
(similar to usual half-metals). Case (ii), referred to as "a spin-valley
half-metal", corresponds to complete polarization with respect to the
spin-valley operator. The properties of these states are discussed.

22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
1
The categories of this paper are: cs
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex