Gap structure and phase diagram of twisted bilayer cuprates from an atomistic perspective.
Oral-In-person
Abstract
Since the prediction of a time-reversal symmetry breaking (TRSB) d + id′ in twisted bilayer cuprate superconductors by Can et al.[1], several experiments have attempted to detect this
state, yielding conflicting results. In this work, we perform a tight-binding lattice model calculation with phenomenological interlayer tunneling, examining explicitly the order parameter
as a function of twist angle, interlayer tunneling, doping, and temperature. We observe the TRSB state to be correlated to the position of the Van Hove singularity in the normal state which
changes not only as a function of doping but also the tunneling strength. We identify two TRSB phases consistent with d+id′ and d+is order, and discuss how they may be distinguished. Finally, we discuss the existing experiments in the context of our results.
Refernce-
[1] Can, O., Tummuru, T., Day, R.P. et al. High-temperature topological superconductivity in twisted double-layer copper oxides. Nat. Phys. 17, 519–524 (2021).
state, yielding conflicting results. In this work, we perform a tight-binding lattice model calculation with phenomenological interlayer tunneling, examining explicitly the order parameter
as a function of twist angle, interlayer tunneling, doping, and temperature. We observe the TRSB state to be correlated to the position of the Van Hove singularity in the normal state which
changes not only as a function of doping but also the tunneling strength. We identify two TRSB phases consistent with d+id′ and d+is order, and discuss how they may be distinguished. Finally, we discuss the existing experiments in the context of our results.
Refernce-
[1] Can, O., Tummuru, T., Day, R.P. et al. High-temperature topological superconductivity in twisted double-layer copper oxides. Nat. Phys. 17, 519–524 (2021).
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Presenters
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siddhant panda
- University of Florida