Odd-parity topological superconductor with nematic order: Application to Cu[subscript x] Bi[subscript 2] Se[subscript 3]
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PhysRevB.90.100509.pdf
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192.59 KB
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Author(s)
Fu, Liang
Date Issued
September 2014
Journal
Physical Review B
Publisher
American Physical Society
Citation
Fu, Liang. “Odd-Parity Topological Superconductor with Nematic Order: Application to Cu[subscript x] Bi[subscript 2] Se[subscript 3].” Phys. Rev. B 90, no. 10 (September 2014). © 2014 American Physical Society
Version
Final published version
Abstract
Cu[subscript x] Bi[subscript 2] Se[subscript 3] 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 In this work, we argue that the unusual anisotropy of the Knight shift observed by Zheng and co-workers (unpublished), taken together with specific heat measurements, provides strong support for an unconventional odd-parity pairing in the two-dimensional E[subscript u] representation of the D[subscript 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. Experimental signatures of the E[subscript u] pairing related to the nematic order are discussed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevB.90.100509
