Confinement-deconfinement transition due to spontaneous symmetry breaking in quantum Hall bilayers.

Abstract:

:Band-inverted electron-hole bilayers support quantum spin Hall insulator and exciton condensate phases. Interest in quantum spin Hall effect in these systems has recently put them in the spotlight. We investigate such a bilayer in an external magnetic field. We show that the interlayer correlations lead to formation of a helical quantum Hall exciton condensate state. Existence of the counterpropagating edge modes in this system results in formation of a ground state spin-texture not supporting gapless single-particle excitations. The charged edge excitations in a sufficiently narrow Hall bar are confined: a charge on one of the edges always gives rise to an opposite charge on the other edge. Magnetic field and gate voltages allow the control of a confinement-deconfinement transition of charged edge excitations, which can be probed with nonlocal conductance. Confinement-deconfinement transitions are of great interest, not least because of their possible significance in shedding light on the confinement problem of quarks.

journal_name

Nat Commun

journal_title

Nature communications

authors

Pikulin DI,Silvestrov PG,Hyart T

doi

10.1038/ncomms10462

subject

Has Abstract

pub_date

2016-01-25 00:00:00

pages

10462

issn

2041-1723

pii

ncomms10462

journal_volume

7

pub_type

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