This article is cited in 5 papers

CONDENSED MATTER

Edge states of an excitonic insulator with the spin–orbit interaction

V. V. Val'kov

Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia

Abstract: The effect of the spin-orbit and Coulomb interactions on the symmetry and topological properties of the $s$, $p$, $d$, and $s + d$ phases of an excitonic insulator has been considered by example of the inverted two-band structure of the HgTe quantum well. It has been found that only the $p$ phase has a nontrivial topology, but it is metastable. It has been shown that the exchange interaction between fermions induces the ground state with the $s + d$ symmetry of the excitonic order parameter. This phase of the excitonic insulator has zero Chern number; nevertheless, edge states occur in the case of open boundaries.

Received: 21.04.2020
Revised: 27.04.2020
Accepted: 27.04.2020

DOI: 10.31857/S1234567820110099

 English version: Journal of Experimental and Theoretical Physics Letters, 2020, 111:11, 647–652

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