@article{ISI:000399799500001,
 abstract = {We present the theory of a new type of topological quantum order which
is driven by the spin-orbit density wave order parameter, and
distinguished by a Z(2) topological invariant. We show that when two
oppositely polarized chiral bands [resulting from the Rashba-type
spin-orbit coupling ak; k is crystal momentum] are significantly nested
by a special wave vector Q similar to (pi, 0)/(0, pi), it induces a
spatially modulated inversion of the chirality (alpha(k+ Q) =
alpha*(k)) between different sublattices. The resulting quantum order
parameters break translational symmetry, but preserve time-reversal
symmetry. It is inherently associated with a Z2-topological invariant
along each density wave propagation direction. Hence it gives a weak
topological insulator in two dimensions, with even number of
spin-polarized boundary states. This phase is analogous to the quantum
spin Hall state, except here the time-reversal polarization is spatially
modulated, and thus it is dubbed quantum spin Hall density wave (QSHDW)
state. This order parameter can be realized or engineered in quantum
wires, or quasi-two-dimensional systems, by tuning the spin-orbit
coupling strength and chemical potential to achieve the special nesting
condition.},
 article-number = {161109},
 author = {Gupta, Gaurav Kumar and Das, Tanmoy},
 doi = {10.1103/PhysRevB.95.161109},
 eissn = {2469-9969},
 issn = {2469-9950},
 journal = {PHYSICAL REVIEW B},
 month = {APR 17},
 number = {16},
 times-cited = {1},
 title = {Quantum spin Hall density wave insulator of correlated fermions},
 unique-id = {ISI:000399799500001},
 volume = {95},
 year = {2017}
}