Strain-induced partially flat band, helical snake states and interface superconductivity in topological crystalline insulators

Tang, Evelyn; Fu, Liang

doi:10.1038/NPHYS3109

Title: Strain-induced partially flat band, helical snake states and interface superconductivity in topological crystalline insulators

Journal Article · Sun Nov 02 00:00:00 EDT 2014 · Nature Physics

DOI:https://doi.org/10.1038/NPHYS3109· OSTI ID:1557721

Tang, Evelyn ^[1]; Fu, Liang ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Topological crystalline insulators in IV–VI compounds host novel topological surface states consisting of multi-valley massless Dirac fermions at low energy. Here we show that strain generically acts as an effective gauge field on these Dirac fermions and creates pseudo-Landau orbitals without breaking time-reversal symmetry. We predict the realization of this phenomenon in IV–VI semiconductor heterostructures, due to a naturally occurring misfit dislocation array at the interface that produces a periodically varying strain field. Remarkably, the zero-energy Landau orbitals form a flat band in the vicinity of the Dirac point, and coexist with a network of snake states at higher energy. We propose that the high density of states of this flat band gives rise to interface superconductivity observed in IV–VI semiconductor multilayers at unusually high temperatures, with non-Bardeen–Cooper–Schrieffer behaviour. Here, our work demonstrates a new route to altering macroscopic electronic properties to achieve a partially flat band, and provides a starting point for realizing novel correlated states of matter.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0010526

OSTI ID:: 1557721

Journal Information:: Nature Physics, Vol. 10, Issue 12; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 160 works

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