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One-dimensional topological metal
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DOI：10.1103/PhysRevB.99.155128.png)
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摘要
En 中文
We propose a type of topological states of matter exhibiting topologically nontrivial edge states (ESs) within gapless bulk states (GBSs) protected by both spin rotational and reflection symmetries. A model presenting such states is simply comprised of a one-dimensional reflection symmetric superlattice in the presence of spin-orbit (SO) coupling containing an odd number of sublattices per unit cell. We show that the system has a rich phase diagram including a topological metal (TM) phase where nontrivial ESs coexist with nontrivial GBSs at Fermi level. Topologically distinct phases can be reached through a subband gap closing-reopening transition depending on the relative strength of inter- and intraunit cell SO couplings. Moreover, the topological class of the system is AI with an integer topological invariant called Z index. The stability of TM states is also analyzed against Zeeman magnetic fields and on-site potentials resulting in that the spin rotational symmetry around the lattice direction is a key requirement for the appearance of such states. Also, possible experimental realizations are discussed.
Keyword:
MAJORANA FERMIONS
NANOWIRE
SUPERCONDUCTOR
INVERSION
SIGNATURE
STATE
PHASE
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期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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