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Eguchi, G.; Peets, Darren C.; Kriener, Markus; Yonezawa, Suguru; Bao, Guang-Ming; Harada, Shota; Inada, Yuji; Zheng, Guojun; Maeno, Y.

doi:10.1103/physrevb.87.161203

Cited by 23 publications

(23 citation statements)

References 22 publications

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“…It has been suggested that the presence of substantial electronic correlations is a necessary ingredient for appreciable spin-triplet pairing in NCSCs 54 , which is one possible explanation for the apparent lack of unconventional behavior in the uncorrelated compound CaIrSi 3 . On the other hand, other uncorrelated materials such as Li 2 Pt 3 B can exhibit spin-triplet pairing 35,55 and an anisotropic superconducting gap 56 , leaving the role of electronic correlation an open question.…”

Section: λ 4γµmentioning

confidence: 99%

Superconducting properties of noncentrosymmetric superconductorCaIrSi3investigated by muon spin relaxation and rotation

et al. 2015

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We have employed muon spin relaxation and rotation (µSR) to investigate the superconducting properties of the noncentrosymmetric superconductor CaIrSi 3 . Measurements of single-crystal specimens confirm the development of a robust superconducting state below T c = 3.55 ± 0.1 K with a ground-state magnetic penetration depth of λ L = 288 ± 10 nm and a coherence length of ξ = 28.8 ± 0.1 nm. The temperature evolution of the superfluid density indicates a nodeless superconducting gap structure dominated by an isotropic spin-singlet component in the dirty limit, with a carrier density of n = (4.6 ± 0.2) × 10 22 cm −3 as determined by Hall resistance measurements. We find no evidence of spontaneous time-reversal symmetry breaking in the superconducting state within an accuracy of 0.05 G. These observations suggest that the influence of any spin-triplet pairing component or multiple gap structure associated with noncentrosymmetric physics is very weak or entirely absent in CaIrSi 3 .

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Section: λ 4γµmentioning

confidence: 99%

Superconducting properties of noncentrosymmetric superconductorCaIrSi3investigated by muon spin relaxation and rotation

et al. 2015

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“…Discussion and Conclusion: Obviously, our DQMC simulations and the results could be applicable to the La AlO 3 /SrTiO 3 interface [38][39][40] and noncentrosymmetric superconductors such as CePt 3 Si, Li 2 (Pt 1−x Pd x ) 3 B [41,42], because strong SOC exists in these materials. The behavior of spin susceptibilities can be determined by Knight shift in nuclear magnetic resonance(NMR) measurements [43].…”

mentioning

confidence: 99%

Berezinskii-Kosterlitz-Thoules phase transition of spin-orbit coupled Fermi gas in optical lattice

Tang¹,

Yang²,

Sun³

et al. 2014

EPL

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We investigate Rashba spin-orbit coupled Fermi gases in square optical lattice by using the determinant quantum Monte Carlo (DQMC) simulations which is free of the sign-problem. We show that the Berezinskii-Kosterlitz-Thoules phase transition temperature is firstly enhanced and then suppressed by spin-orbit coupling in the strong attraction region. In the intermediate attraction region, spin-orbit coupling always suppresses the transition temperature. We also show that the spin susceptibility becomes anisotropic and retains finite values at zero temperature. Introduction: Spin-orbit coupling (SOC), breaking the inversion symmetry, has attracted extensive attentions in condensed matter [1,2]. Recently, SOC in both the bosonic [3,4] and fermionic [5,6] systems has been realized in ultracold atomic experiments. These milestone breakthroughs have opened up an exciting route to study the novel phases [7][8][9][10][11][12][13][14][15] induced by SOC in these systems.By introducing SOC, two dimensional (2D) fermionic systems exhibit much more rich phenomena [16][17][18][19][20]. SOC can stabilize the topological nontrivial superfluid states [21][22][23][24]. Majorana zero mode exists in the vortices of these topological nontrivial phases and plays a crucial role in topological quantum computation [25]. It was found that SOC has nontrivial effect on pairing and superfluidity [22,26] in homogeneous systems. SOC enhances the pairing but suppresses the superfluidity. On lattice, SOC exhibits opposite filling-dependent behaviors for the superfluidity [27]. These interesting physics induced by SOC are all investigated by the Bogoliubovde Gennes (BdG) approach. Moreover, the study of the spin-orbit coupled Fermi gases in lattice at finite temperature is still waiting to be explored.Two effects are resulted by applying SOC in the Fermi Hubbard model. First, SOC enhances the effective hopping amplitude and enlarges the bandwidth. The other is that SOC flips the spin of the fermion which breaks the rotational symmetry of the spin and significantly changes the properties of the Fermi surface. When the system only contains the SOC, the ground state is semimetal near half-filling[27] with vanishingly small density of state(DOS)(ρ(E) ∼ |E|). In the strong attractive limit, the fermions are strongly bounded and the superfluid transition temperature is determined by the center-ofmass motion which is proportional to the inverse of the attraction. Therefore, our major concern here is to investigate what effects can be induced by the SOC on the pairing at finite temperature beyond the BdG approach.In this Letter we investigate the pairing of the attractive Fermi gases in 2D square optical lattice with SOC using both DQMC simulations [28][29][30][31][32] and mean field theory. To our knowledge, this is the first unbi-

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“…For example, in CePt 3 Si 25-27 , macroscopic as well as microscopic measurements indicate an unconventional superconducting state with a mixture of spinsinglet and spin-triplet pairing components and line nodes in the superconducting gap. Experimental evidence for unconventional pairing symmetries has also been reported for CeIrSi 3 28 , CeRhSi 3 29 , Y 2 C 3 30 , Li 2 Pt 3 B [31][32][33] , and BiPd 34 . Both fully gapped and nodal NCSs with sizable spin-triplet pairing components exhibit nontrivial topological properties, which manifest themselves in terms of different types of zeroenergy surface states.…”

Section: Introductionmentioning

confidence: 74%

Majorana vortex-bound states in three-dimensional nodal noncentrosymmetric superconductors

et al. 2014

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Noncentrosymmetric superconductors (NCSs), characterized by antisymmetric spin-orbit coupling and a mixture of spin-singlet and spin-triplet pairing components, are promising candidate materials for topological superconductivity. An important hallmark of topological superconductors is the existence of protected zero-energy states at surfaces or in vortex cores. Here we investigate Majorana vortex-bound states in three-dimensional nodal and fully gapped NCSs by combining analytical solutions of Bogoliubov-de Gennes (BdG) equations in the continuum with exact diagonalization of BdG Hamiltonians. We show that depending on the crystal pointgroup symmetries and the topological properties of the bulk Bogoliubov-quasiparticle wave functions, different types of zero-energy Majorana modes can appear inside the vortex core. We find that for nodal NCSs with tetragonal point group C4v the vortex states are dispersionless along the vortex line, forming one-dimensional Majorana flat bands, while for NCSs with D4 point-group symmetry the vortex modes are helical Majorana states with a linear dispersion along the vortex line. NCSs with monoclinic point group C2, on the other hand, do not exhibit any zero-energy vortex-bound states. We show that in the case of the C4v (D4) point group the stability of these Majorana zero modes is guaranteed by a combination of reflection (π rotation), time-reversal, and particle-hole symmetry. Considering continuous deformations of the quasiparticle spectrum in the presence of vortices, we show that the flat-band vortex-bound states of C4v point-group NCSs can be adiabatically connected to the dispersionless vortex-bound states of time-reversal symmetric Weyl superconductors. Experimental implications of our results for thermal transport and tunneling measurements are discussed.

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Phonon anomaly and anisotropic superconducting gap in noncentrosymmetric Li2(Pd1−xPt

Cited by 23 publications

References 22 publications

Superconducting properties of noncentrosymmetric superconductorCaIrSi3investigated by muon spin relaxation and rotation

Superconducting properties of noncentrosymmetric superconductorCaIrSi3investigated by muon spin relaxation and rotation

Berezinskii-Kosterlitz-Thoules phase transition of spin-orbit coupled Fermi gas in optical lattice

Majorana vortex-bound states in three-dimensional nodal noncentrosymmetric superconductors

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