Link between superconductivity and a Lifshitz transition in intercalated Bi${}_2$Se${}_3$

Abstract

Topological superconductivity is an exotic phase of matter in which the fully gapped superconducting bulk hosts gapless Majorana surface states protected by topology. Intercalation of copper, strontium or niobium between the quintuple layers of the topological insulator Bi${}_2$Se${}_3$ increases the carrier density and leads to superconductivity that is suggested to be topological. Here we study the electronic structure of strontium-intercalated Bi${}_2$Se${}_3$ using angle resolved photoemission spectroscopy (ARPES) and Shubnikov-de Haas (SdH) oscillations. Despite the apparent low Hall number of $\sim 2\times 10^{19}$cm${}^{-3}$, we show that the Fermi surface is shaped as an open cylinder with a larger carrier density of $\sim 10^{20}$cm${}^{-3}$. We suggest that superconductivity in intercalated Bi${}_2$Se${}_3$ emerges with the appearance of a quasi-2D open Fermi surface.

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Cited by in corpus (8)

• The absence of Ginzburg-Landau mechanism for vestigial order in the normal phase above a two-component superconductor
• Breaking of Ginzburg-Landau description in the temperature dependence of the anisotropy in the nematic superconductor
• Lifshitz transition in dirty nematic superconductor
• Quasiparticle interference in doped topological insulators with nematic superconductivity
• Pauli paramagnetism of triplet Cooper pairs in a nematic superconductor
• Electronic Transport Studies of Ag-doped Bi2Se3 Topological Insulator
• Anomalous behavior of the $E_u^1$ infrared-active phonon mode in a Bi${}_{2-x}$Sr${}_x$Se${}_3$ crystal
• Anomalous Josephson Hall effect in doped topological insulators with the nematic superconductivity