Correlation Effects in Quantum Spin-Hall Insulators: A Quantum Monte Carlo Study

被引：228

作者：

Hohenadler, M. ^{[1
]}

Lang, T. C. ^{[1
]}

Assaad, F. F. ^{[1
]}

机构：

[1] Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.106.100403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider the Kane-Mele model supplemented by a Hubbard U term. The phase diagram is mapped out using projective auxiliary field quantum Monte Carlo simulations. The quantum spin liquid of the Hubbard model is robust against weak spin-orbit interaction, and is not adiabatically connected to the spin-Hall insulating state. Beyond a critical value of U > U(c) both states are unstable toward magnetic ordering. In the quantum spin-Hall state we study the spin, charge, and single-particle dynamics of the helical Luttinger liquid by retaining the Hubbard interaction only on a ribbon edge. The Hubbard interaction greatly suppresses charge currents along the edge and promotes edge magnetism but leaves the single-particle signatures of the helical liquid intact.

引用

页数：4

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