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Title: Superconductivity in three-dimensional spin-orbit coupled semimetals

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [2];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Université de Lyon (France)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Here, motivated by the experimental detection of superconductivity in the low-carrier density half-Heusler compound YPtBi, we study the pairing instabilities of three-dimensional strongly spin-orbit coupled semimetals with a quadratic band touching point. In these semimetals the electronic structure at the Fermi energy is described by spin j = 3/2 quasiparticles, which are fundamentally different from those in ordinary metals with spin j = 1/2. For both local and nonlocal pairing channels in j = 3/2 materials we develop a general approach to analyzing pairing instabilities, thereby providing the computational tools needed to investigate the physics of these systems beyond phenomenological considerations. Furthermore, applying our method to a generic density-density interaction, we establish that: (i) The pairing strengths in the different symmetry channels uniquely encode the j = 3/2 nature of the Fermi surface band structure—a manifestation of the fundamental difference with ordinary metals. (ii) The leading odd-parity pairing instabilities are different for electron doping and hole doping. Finally, we argue that polar phonons, i.e., Coulomb interactions mediated by the long-ranged electric polarization of the optical phonon modes, provide a coupling strength large enough to account for a Kelvin-range transition temperature in the s-wave channel, and are likely to play an important role in the overall attraction in non- s -wave channels. Furthermore, the explicit calculation of the coupling strengths allows us to conclude that the two largest non- s-wave contributions occur in nonlocal channels, in contrast with what has been commonly assumed.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
FG02-03ER46076; SC0010526
OSTI ID:
1505765
Alternate ID(s):
OSTI ID: 1416451
Journal Information:
Physical Review. B, Vol. 96, Issue 21; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 70 works
Citation information provided by
Web of Science

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Cited By (14)

Kohn-Luttinger correction to T c in a phonon superconductor journal January 2020
Beyond triplet: Unconventional superconductivity in a spin-3/2 topological semimetal journal April 2018
Instability caused by the fermion–fermion interactions combined with rotational and particle-hole asymmetries in three-dimensional materials with quadratic band touching journal May 2019
Singular low-energy states of tilted Dirac semimetals induced by the fermion-fermion interactions journal December 2019
Beyond Triplet: Unconventional Superconductivity in a Spin-3/2 Topological Semimetal text January 2016
Tailoring $T_c$ by symmetry principles: The concept of Superconducting Fitness text January 2018
Topological Superconductivity in Twisted Multilayer Graphene text January 2018
Weak-Pairing Higher Order Topological Superconductors text January 2018
Bogoliubov Fermi surfaces: General theory, magnetic order, and topology text January 2018
Dielectric and electronic properties of three-dimensional Luttinger semimetals with a quadratic band touching text January 2019
Instability caused by the fermion-fermion interactions combined with rotational and particle-hole asymmetries in three-dimensional materials with quadratic band touching text January 2019
Experimental consequences of Bogoliubov Fermi surfaces text January 2019
Critical phenomena at the complex tensor ordering phase transition journal February 2018
Interacting spin-3/2 fermions in a Luttinger semimetal: Competing phases and their selection in the global phase diagram text January 2018

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