Superconductivity with two-fold symmetry in topological superconductor SrxBi2Se3

Abstract

Topological superconductivity is the quantum condensate of paired electrons with an odd parity of the pairing function. One of the candidates is the triplet pairing superconductor derived from topological insulator Bi2Se3 by chemical doping. Theoretically it was predicted that a two-fold superconducting order parameter may exist in this kind of bulk topological superconductor. Earlier experiments by nuclear magnetic resonance and angle-resolved magnetocaloric measurements seem to support this picture. By using a Corbino-shape like electrode configuration, we measure the c-axis resistivity without the influence of the vortex motion and find clear evidence of two-fold superconductivity in the recently discovered topological superconductor SrxBi2Se3. The Laue diffraction measurements on these samples show that the maximum gap direction is either parallel or perpendicular to the main crystallographic axis.

arXiv comment21 pages, 6 figures, including the Supplementary Notes

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• Intertwined vestigial order in quantum materials: nematicity and beyond
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• Direct visualization of the nematic superconductivity in Cu${}_x$Bi${}_2$Se${}_3$
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• Topological phase transitions in multi-component superconductors
• Quasi-particle evidence for the nematic state above $T_{\mathrm{c}}$ in Sr${}_x$Bi${}_2$Se${}_3$
• Evidence for nematic superconductivity of topological surface states in PbTaSe2
• Nanocalorimetric Evidence for Nematic Superconductivity in the Doped Topological Insulator Sr${}_{0.1}$Bi${}_2$Se${}_3$
• Direction and symmetry transition of the vector order parameter in topological superconductors Cu${}_x$Bi${}_2$Se${}_3$
• Possible three-dimensional nematic odd-parity superconductivity in Sr${}_2$RuO${}_4$
• Pressure-induced superconductivity in topological semimetal NbAs2
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• Chiral Higgs Mode in Nematic Superconductors
• Evidence for singular-phonon-induced nematic superconductivity in a topological superconductor candidate Sr${}_{0.1}$Bi${}_2$Se${}_3$
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• Signatures of Nematic Superconductivity in Doped Bi${}_2$Se${}_3$ under Applied Stress
• Twofold symmetry of proximity-induced superconductivity in Bi${}_2$Te${}_3$/Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ heterostructures revealed by scanning tunneling microscopy
• Nematicity of correlated systems driven by anisotropic chemical phase separation
• Crystal structure and distortion of superconducting Cu${}_x$Bi${}_2$Se${}_3$
• Two-fold symmetry of in-plane magnetoresistance anisotropy in the superconducting states of BiCh2-based LaO0.9F0.1BiSSe single crystal
• Type-I and type-II topological nodal superconductors with $s$-wave interaction
• Phonon-induced rotation of the electronic nematic director in superconducting Bi${}_2$Se${}_3$
• Zero-Energy Modes on Superconducting Bismuth Islands Deposited on Fe(Te,Se)
• Manipulating the nematic director by magnetic fields in the spin-triplet superconducting state of CuxBi2Se3
• Probing three-state Potts nematic fluctuations by ultrasound attenuation
• Local pairing versus bulk superconductivity intertwined by the charge density wave order in Cs(V${}_{1-x}$Ta${}_x$)${}_3$Sb${}_5$
• Visualizing Pairing Symmetry in Nematic Superconductors using spin-polarized spectroscopy of magnetic impurities
• Odd-frequency pairs and anomalous proximity effect in nematic and chiral states of superconducting topological insulators
• Investigation of superconducting properties and possible nematic superconductivity in self-doped BiCh2-based superconductor CeOBiS1.7Se0.3
• Possible two-component pairings in electron-doped Bi${}_2$Se${}_3$ based on a tight-binding model
• Shear Modulus Anomaly of Unconventional Superconductor in a Symmetry Breaking Field
• Ubiquity of rotational symmetry breaking in superconducting films, from Fe(Te,Se)/Bi${}_2$Te${}_3$ to Nb, and the effect of measurement geometry
• Engineering Helical Superconductors with Multiple Majorana Kramers Pairs via Higher-Order Rashba Spin-Orbit Coupling
• Unconventional superconductivity from electronic dipole fluctuations
• Theory of Topological Superconductivity in Doped IV-VI Semiconductors