Odd-parity topological superconductor with nematic order: Application to CuxBi2Se3

Fu, Liang

doi:10.1103/physrevb.90.100509

Title: Odd-parity topological superconductor with nematic order: Application to ${Cu}_{x} {Bi}_{2} {Se}_{3}$

Journal Article · Fri Sep 26 00:00:00 EDT 2014 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/physrevb.90.100509· OSTI ID:1505788

Fu, Liang ^[1]

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

Cu_xBi₂Se₃ was recently proposed as a promising candidate for time-reversal-invariant topological superconductors. In this work, we argue that the unusual anisotropy of the Knight shift observed by Zheng and co-workers (unpublished), taken together with specific heat measurements, provides strong support for an unconventional odd-parity pairing in the two-dimensional E_u representation of the D_3d crystal point group, which spontaneously breaks the threefold rotational symmetry of the crystal, leading to a subsidiary nematic order. We predict that the spin-orbit interaction associated with hexagonal warping plays a crucial role in pinning the two-component order parameter and makes the superconducting state generically fully gapped, leading to a topological superconductor. In conclusion, experimental signatures of the E_u pairing related to the nematic order are discussed.

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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:: 1505788

Alternate ID(s):: OSTI ID: 1181411

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 10; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 163 works

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