Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity – Poster I

TT 22.4: Poster

Montag, 9. März 2026, 18:00–20:00, P1

prediction of SJTM observables in putative PDW state in cuprates — •Monikana Gope, Shaswat Chaturvedi, and Peayush Choubey — Department of Physics, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India

The coexistence of competing electronic phases, such as pair-density wave (PDW) and charge-density wave (CDW), in high-temperature superconductors remains unresolved. These phases originate from distinct mechanisms, exhibit spatial modulations, and influence superconductivity differently. Scanning Josephson Tunnelling Microscopy (SJTM) enables atomic-scale probing of these modulations by measuring Josephson and quasiparticle tunnelling currents between a superconducting tip and a superconducting sample, thus serving as a direct local probe of the superconducting gap order parameter. Using this technique, we aim to distinguish PDW signatures from other competing orders in cuprates. Starting with the tJ model, which captures strong electron correlations and the interplay between electron hopping, exchange interactions, and strong correlation effects in cuprate superconductors, we stabilise a metastable PDW phase under specific doping and fixed-temperature conditions. We then compute the critical current for a superconducting s-wave tip in both PDW and PDW + dSC states, finding distinct modulations in Ic and abs(Ic). Finally, we employ a Wannier-function-based continuum approach to calculate the critical current and predict characteristic SJTM signatures of the PDW state.

Keywords: high temperature superconductivity; PDW state; Cuprates; Scanning Josephson Tunneling Microscopy; Wannier-function approach