Optimal superconductivity in twisted bilayer WSe2 where the Van Hove singularity crosses half-filling
Michał Zegrodnik, Waseem Akbar, Andrzej Biborski, Louk Rademaker
DOI 10.1103/pkf3-fkv4 · Physical Review Research
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Abstract
The recent discovery of unconventional superconductivity has pointed to twisted WSe2 bilayer as a versatile platform for studying the correlated and topological phases of matter. Here, we analyze the effect of the displacement field and electron interactions on the formation of a topological paired state in twisted WSe2. Our approach is based on the effective single band t−J−U model supplemented with intersite Coulomb interaction term and treated within the Gutzwiller approximation. We show that the superconducting phase is stabilized in a small range of displacement fields where the Van Hove singularity crosses half-filling, which is in qualitative agreement with recent experimental data. According to our analysis, such a circumstance comes as a result of a subtle interplay between the large density of states of the Van Hove singularity, in combination with the renormalization effects that appear in the weak-to-moderate correlation regime. The two factors create favorable conditions for the superconducting pairing only in a small area of the phase diagram.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| WSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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