Superconductivity with Topological Surface State in SrxBi2Se3

Liu, Zhongheng; Yao, Xin Cheng; Shao, Jifeng; Zuo, Ming J.; Pi, Li; Tan, Shun; Zhang, Changjin; Zhang, Yuheng

doi:10.1021/jacs.5b06815

Cited by 291 publications

(330 citation statements)

References 28 publications

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“…However, whether or not the Cu x Bi 2 Se 3 is a topological superconductor is still controversial. Recently, we found that an alternative compound, Sr x Bi 2 Se 3 , exhibits superconductivity with high superconducting volume fraction [21]. The following investigations have revealed that the atomic position of Sr in Sr x Bi 2 Se 3 is completely different from that of Cu in Cu x Bi 2 Se 3 .…”

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confidence: 92%

“…That is, the copper atoms are intercalated in the weakly van der Waals bonded Se-Se layers, while most of the intercalated strontium atoms are located in the Se-Bi-Se-Bi-Se quintuple layer [22]. Furthermore, the Sr x Bi 2 Se 3 compounds exhibit well-separated topological surface state from the bulk bands [21][22][23][24]. These facts suggest that the Sr x Bi 2 Se 3 compound exhibits interesting physical phenomena and could serve as an important material base for the investigation of topological superconducting-related properties.…”

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confidence: 99%

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Pressure-induced reemergence of superconductivity in topological insulatorSr0.065Bi2Se3

Zhou¹,

Chen²,

Zhang³

et al. 2016

Phys. Rev. B

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The recent-discovered Sr x Bi 2 Se 3 superconductor provides an alternative and ideal material base for investigating possible topological superconductivity. Here, we report that in Sr 0.065 Bi 2 Se 3 , the ambient superconducting phase is gradually depressed upon the application of external pressure.At high pressure, a second superconducting phase emerges at above 6 GPa, with a maximum T c value of ∼8.3 K. The joint investigations of the high-pressure synchrotron x-ray diffraction and electrical transport properties reveal that the re-emergence of superconductivity in Sr 0.065 Bi 2 Se 3 is closely related to the structural phase transition from ambient rhombohedral phase to highpressure monoclinic phase around 6 GPa, and further to another high-pressure tetragonal phase above 25 GPa.

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confidence: 92%

mentioning

confidence: 99%

Pressure-induced reemergence of superconductivity in topological insulatorSr0.065Bi2Se3

Zhou¹,

Chen²,

Zhang³

et al. 2016

Phys. Rev. B

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“…For clean and perfect surface, the SABSs should be detectable. Recently, the possible existence of surface states in superconducting Sr x Bi 2 Se 3 is inferred from the Shubnikov-de Hass oscillation measurement [30]. In combination with the results of the present work, it is therefore highly desirable to reexamine the existence of the SABSs in Cu x Bi 2 Se 3 as a crucial test for the relevancy of the proposed SC pairing [11,22,31].…”

Section: Introductionmentioning

confidence: 67%

Nematic superconductivity in CuxBi2Se3 : Surface Andreev bound states

Hao

Ting

2017

Phys. Rev. B

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We study theoretically the topological surface states (TSSs) and the possible surface Andreev bound states (SABSs) of CuxBi2Se3 which is known to be a topological insulator at x = 0. The superconductivity (SC) pairing of this compound is assumed to have the broken spin-rotation symmetry, similar to that of the A-phase of 3 He as suggested by recent nuclear-magnetic resonance experiments. For both spheroidal and corrugated cylindrical Fermi surfaces with the hexagonal warping terms, we show that the bulk SC gap is rather anisotropic; the minimum of the gap is negligibly small as comparing to the maximum of the gap. This would make the fully-gapped pairing effectively nodal. For a clean system, our results indicate the bulk of this compound to be a topological superconductor with the SABSs appearing inside the bulk SC gap. The zero-energy SABSs which are Majorana fermions, together with the TSSs not gapped by the pairing, produce a zero-energy peak in the surface density of states (SDOS). The SABSs are expected to be stable against short-range nonmagnetic impurities, and the local SDOS is calculated around a nonmagnetic impurity. The relevance of our results to experiments is discussed.

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“…To date, possible topological superconductivity has been suggested in Cu-or Sr-intercalated Bi 2 Se 3 [19][20][21][22][23][24][25], In-doped SnTe [26], highly-pressured Bi 2 Te 3 and Sb 2 Te 3 [27,28], point-contact induced pressure in Cd 3 As 2 [29], and hybrid superconductor-semiconductor or -topological insulator heterostructures [30][31][32]. However, Pd-Bi family [33][34][35] of superconductors are particularly interesting because both Bi and Pd atoms intrinsically maintain strong spin-orbit coupling (SOC).…”

Section: Introductionmentioning

confidence: 99%

Low-energy surface states in the normal state of α−PdBi2 superconductor

Choi

Neupane

Sasagawa

et al. 2017

Phys. Rev. Materials

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Topological superconductors as characterized by Majorana surface states have been actively searched for their significance in fundamental science and technological implication. The large spin-orbit coupling in Bi-Pd binaries has stimulated extensive investigations on the topological surface states in these superconducting compounds. Here we report a study of normal-state electronic structure in a centrosymmetric α-PdBi2 within density functional theory calculations. By investigating the electronic structure from the bulk to slab geometries in this system, we predict for the first time that α-PdBi2 can host orbital-dependent and asymmetric Rashba surface states near the Fermi energy. This study suggests that α-PdBi2 will be a good candidate to explore the relationship between superconductivity and topology in condensed matter physics.

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Superconductivity with Topological Surface State in Sr_xBi₂Se₃

Cited by 291 publications

References 28 publications

Pressure-induced reemergence of superconductivity in topological insulatorSr0.065Bi2Se3

Pressure-induced reemergence of superconductivity in topological insulatorSr0.065Bi2Se3

Nematic superconductivity in CuxBi2Se3 : Surface Andreev bound states

Low-energy surface states in the normal state of α−PdBi2 superconductor

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