Magnetic Instability on the Surface of Topological Insulators

Details Magnetic Instability on the Surface of Topological Insulators Magnetic Instability on the Surface of Topological Insulators

2011-10-18

arxiv.org/abs/1110.4037v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

Gapless surface states that are protected by time reversal symmetry and charge conservation are among the manifestations of 3D topological insulators. In this work we study how electron-electron interaction may lead to spontaneous breaking of time reversal symmetry on surfaces of such insulators. We find that a critical interaction strength exists, above which the surface is unstable to spontaneous formation of magnetization, and study the dependence of this critical interaction strength on temperature and chemical potential.

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