Chiral topological excitonic insulator in semiconductor quantum wells

Details Chiral topological excitonic insulator in semiconductor quantum wells Chiral topological excitonic insulator in semiconductor quantum wells

2010-09-14

arxiv.org/abs/1009.2569v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 4 figures

Scientific paper

We present a scheme to realize the chiral topological excitonic insulator in semiconductor heterostructures which can be experimentally fabricated with a coupled quantum well adjacent to twoferromagnetic insulating films. The different mean-field chiral topological orders, which are due to the change in the directions of the magnetization of the ferromagnetic films, can be characterized by the TKNN numbers in the bulk system as well as by the winding numbers of the gapless states in the edged system. Furthermore, we propose an experimental scheme to detect the emergence of the chiral gapless edge state and distinguish different chiral topological orders by measuring the thermal conductance.

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