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TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Poster

TT 18.13: Poster

Monday, March 18, 2024, 15:00–18:00, Poster C

Spontaneous split of surface states in d-wave superconductors — •Ambjörn Joki, Kevin Seja, Mikael Fogelström, and Tomas Löfwander — Chalmers University of Technology, Gothenburg, Sweden

Since the experimental discovery [1] of the split of surface states at pair-breaking edges in two-dimensional d-wave superconductors, different theories have been put forward in attempts to explain it. These theories can be grouped into two main categories, explaining the split either by spontaneous currents [2] or surface magnetisation [3]. To study the competition between these mechanisms, we are using a tJ-model [4-5] that includes strong correlation effects, as previously done without magnetism [6]. By combining a mean-field approach with the Gutzwiller approximation we can treat magnetism and superconductivity on the same footing.

[1] M. Covington et al., Phys. Rev. Lett. 79, 277 (1997)

[2] M. Håkansson et al., Nat. Phys. 11, 755 (2015)

[3] A. Potter and P. A. Lee, Phys. Rev. Lett 112, 117002 (2014)

[4] M. Ogata and A. Himeda, JPSJ 72, 374 (2003)

[5. R. B. Christensen et al., Phys. Rev. B 84, 184511 (2011)

[6] D. Chakraborty et al., npj Quantum Mater. 7, 44 (2022)

Keywords: tJ-model; d-wave superconductors; spontaneous symmetry breaking; competing orders; Gutzwiller approximation