Unusual 
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 phase diagram of 
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: The role of staggered noncentrosymmetricity

Schertenleib, Eric; Fischer, Mark H.; Sigrist, Manfred

doi:10.1103/physrevresearch.3.023179

Cited by 41 publications

(21 citation statements)

References 28 publications

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“…14. After the experimental report of CeRh 2 As 2 , several theoretical studies investigated the effects of 3D stacking structure, interlayer pairing, and disorders on the anomalous paramagnetic effect and phase diagram 177,[194][195][196][197] . The present results basically support the parity transition in the superconducting state.…”

Section: B Odd-parity Superconductivitymentioning

confidence: 99%

“…Very recently, the field-induced odd-parity superconducting state has been reported in the bulk CeRh 2 As 2 having the locally noncentrosymmetric bilayer structure 165 . Motivated by this discovery, interest on the locally noncentrosymmetric superconductivity and the PDW state is increasing [194][195][196][197] . Thus, attention is naturally paid to the possible TSC in CeRh 2 As 2 .…”

Section: Summary and Outlook Of This Sectionmentioning

confidence: 99%

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Topological d-wave superconductivity in two dimensions

Yanase,

Daido,

Takasan

et al. 2021

Preprint

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Despite intensive searches for topological superconductors, the realization of topological superconductivity remains under debate. Previous proposals for the topological s-wave, p-wave, and chiral d-wave superconductivity have both advantages and disadvantages. In this review, we discuss two-dimensional topological superconductivity based on the non-chiral d-wave superconductors. It is shown that the noncentrosymmetric d-wave superconductors become topological superconductors under an infinitesimal Zeeman field without fine-tuning of parameters. Floquet engineering for introducing the Zeeman field in a controllable way is also proposed. When the two-dimensional noncentrosymmetric superconductors are stacked to recover the global inversion symmetry, the fieldinduced parity transition may occur, and the high-field odd-parity superconducting state realizes various topological phases depending on the stacking structures. Two-dimensional heterostructures of strongly correlated electron systems, which have been developed by recent experiments, are proposed as a platform of the high-temperature topological superconductivity and the interplay of topology and strong correlations in superconductors.

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Section: B Odd-parity Superconductivitymentioning

confidence: 99%

Section: Summary and Outlook Of This Sectionmentioning

confidence: 99%

Topological d-wave superconductivity in two dimensions

Yanase,

Daido,

Takasan

et al. 2021

Preprint

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“…One could for instance derive the Ginzburg-Landau coefficients as used in Ref. [25] from the microscopic theory provided here. For a more realistic treatment, we suggest starting from the Eilenberger matrix equation (10), consider α, λ, t 1 and t 2 simultaneously, and develop the corresponding Riccati equations for numerical simulations of the Abrikosov lattice.…”

Section: G Perspectivesmentioning

confidence: 99%

“…This type of phase diagram has been predicted by theories developed for LNCS superconductors [10-14, 19, 20], but was not observed in any previous material or heterostructure lacking inversion symmetry locally. The observation of this unique two-phase phase diagram in CeRh 2 As 2 generates multiple questions, and has caused a revival of research in LNCS [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in disordered locally noncentrosymmetric materials: an application to CeRh$_2$As$_2$

Möckli,

Ramires

2021

Preprint

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Layered three-dimensional centrosymmetric crystals can exhibit characteristics of noncentrosymmetric materials. This happens when each individual layer alone lacks inversion, but, when combined, inversion symmetry is restored; hence the designation: locally noncentrosymmertic superconductors (LNCSs). In LNCSs, the effects of impurities and subdominant magnetic field induced pairing channels remain unexplored. Using a minimal model, we examine all pairing channels and show that there is always a subdominant superconducting instability that is favored at high magnetic fields, which can substantially alter the magnetic field -temperature phase diagram. Also, we find that the phase diagram responds to disorder in a non-monotonic way, which can be subjected to experimental verification. We apply these ideas to the recently unveiled two-phase superconducting phase diagram of CeRh2As2. We identify the two phases as singlet-triplet mixed even-and odd-parity states at low and a high fields, respectively. Furthermore, we predict the presence of two superconducting phases also for in-plane magnetic fields in cleaner samples, since a high-field phase could have been so far hindered by impurity effects.

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“…gated theoretically [10][11][12][13][14][15][16] and experimentally [17]. However, the electronic structure of the material, which is the most basic information for the discussion of the physical properties, has not been investigated experimentally so far, although the electronic structure using DFT calculations has been reported [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Optical study on electronic structure of the locally non-centrosymmetric CeRh$_2$As$_2$

Kimura¹,

Sichelschmidt²,

Khim³

2021

Preprint

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The electronic structures of the heavy-fermion superconductor CeRh2As2 with the local inversion symmetry breaking and the reference material LaRh2As2 have been investigated by using experimental optical conductivity (σ1(ω)) spectra and first-principal DFT calculations. In the low-temperature σ1(ω) spectra of CeRh2As2, a 4f -conduction electron hybridization and heavy quasiparticles are clearly indicated by a mid-infrared peak and a narrow Drude peak. In LaRh2As2, these features are absent in the σ1(ω) spectrum, however, it can nicely be reproduced by DFT calculations. For both compounds, the combination between a local inversion symmetry breaking and a large spin-orbit (SO) interaction plays an important role for the electronic structure, however, the SO splitting bands could not be resolved in the σ1(ω) spectra due to the small SO splitting size.

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Unusual H−T phase diagram of CeRh2As2 : The role of staggered noncentrosymmetricity

Cited by 41 publications

References 28 publications

Topological d-wave superconductivity in two dimensions

Topological d-wave superconductivity in two dimensions

Superconductivity in disordered locally noncentrosymmetric materials: an application to CeRh$_2$As$_2$

Optical study on electronic structure of the locally non-centrosymmetric CeRh$_2$As$_2$

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