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20 results on '"Fischer, Mark"'

4. Towards a topological quantum chemistry description of correlated systems: The case of the Hubbard diamond chain

Author

Iraola, Mikel, primary, Heinsdorf, Niclas, additional, Tiwari, Apoorv, additional, Lessnich, Dominik, additional, Mertz, Thomas, additional, Ferrari, Francesco, additional, Fischer, Mark H., additional, Winter, Stephen M., additional, Pollmann, Frank, additional, Neupert, Titus, additional, Valentí, Roser, additional, and Vergniory, Maia G., additional

Published
2021
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13. Chirald-wave superconductivity in SrPtAs

Author

Fischer, Mark H., primary, Neupert, Titus, additional, Platt, Christian, additional, Schnyder, Andreas P., additional, Hanke, Werner, additional, Goryo, Jun, additional, Thomale, Ronny, additional, and Sigrist, Manfred, additional

Published
2014
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14. Chiral d-wave Superconductivity in SrPtAs

Author

Fischer Mark H.

Subjects
Condensed Matter::Superconductivity
Abstract

Recent µSR measurements on SrPtAs revealed time reversal symmetry breaking with the onset of superconductivity [Biswas et al. Phys. Rev. B 87 180503(R) (2013)] suggesting an unconventional superconducting state. We investigate this possibility via functional renormalization group and find a chiral (d+id) wave order parameter favored by the multiband fermiology and hexagonal symmetry of SrPtAs. This (d+id) wave state exhibits significant gap anisotropies as well as gap differences on the different bands but only has point nodes on one of the bands at the Brillouin zone corners. We study the topological characteristics of this superconducting phase which features Majorana Weyl nodes in the bulk protected surface states and an associated thermal Hall response. The lack of extended nodes and the spontaneously broken time reversal symmetry of the (d+id) wave state are in agreement with the µSR experiments. Our theoretical findings together with the experimental evidence thus suggests that SrPtAs is the first example of chiral d wave superconductivity.

Published
2014

20. Fluctuation and strain effects in a chiral p-wave superconductor.

Author

Fischer, Mark H. and Berg, Erez

Subjects
*SUPERCONDUCTORS, *FLUCTUATIONS (Physics), *SYMMETRY breaking
Abstract

For a tetragonal material, order parameters of px and py symmetry are related by rotation and hence have the same Tc at a mean-field level. This degeneracy can be lifted by a symmetry-breaking field, such as (uniaxial) in-plane strain, such that at Tc, the order parameter is only of px or py symmetry. Only at a lower temperature also the respective other order parameter condenses to form a chiral p-wave state. At the mean-field level, the derivative of Tc with strain is discontinuous at zero strain. We analyze the consequences of (thermal) fluctuations on the strain-temperature phase diagram within a Ginzburg-Landau approach. We find that the order-parameter fluctuations can drive the transition to be weakly first order, rounding off this discontinuity. We discuss the possibility of a second-order transition into a nonsuperconducting time-reversal-symmetry-breaking phase and consequences for the spin-triplet superconductor Sr2RuO4. [ABSTRACT FROM AUTHOR]

Published
2016
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