Chiral Lattice Supersolid on Edges of Quantum Spin Hall Samples

Tsvelik, Alexei M.; Yevtushenko, Oleg M.

doi:10.1103/PhysRevB.98.081118

Title: Chiral Lattice Supersolid on Edges of Quantum Spin Hall Samples

Journal Article · Fri Aug 31 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.081118· OSTI ID:1466588

^[1]; Yevtushenko, Oleg M. ^[2]

Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Ludwig Maximilians Univ., Munich (Germany). Arnold Sommerfeld Center and Center for Nano-Science

We show that edges of Quantum Spin Hall topological insulators represent a natural platform for realization of exotic magnetic phase which has all properties of lattice supersolid. On one hand, fermionic edge modes are helical due to the nontrivial topology of the bulk. On the other hand, a disorder at the edge or magnetic adatoms may produce a dense array of localized spins interacting with the helical electrons. The spin subsystem is magnetically frustrated since the indirect exchange favors formation of helical spin order and the direct one favors (anti)ferromagnetic ordering of the spins. At a moderately strong direct exchange, the competition between these spin interactions results in the spontaneous breaking of parity and in the Ising type order of the z-components at zero temperature. If the total spin is conserved the spin order does not pin a collective massless helical mode which supports the ideal transport. In this case, the phase transition converts the helical spin order to the order of a chiral lattice supersolid. Furthermore, this represents a radically new possibility for experimental studies of the elusive supersolidity.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1466588

Alternate ID(s):: OSTI ID: 1467935

Report Number(s):: BNL-207993-2018-JAAM

Journal Information:: Physical Review B, Vol. 98, Issue 8; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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