Correlated phases and quantum geometry in twisted WSe2

DIPC Seminars

Speaker

Daniel Muñoz-Segovia
Columbia University

When

2026/01/09
12:00

Place

DIPC Josebe Olarra Seminar Room

Host

Fernando de Juan

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Over a range of twist angles, twisted WSe2 displays a superconducting phase in proximity to a correlated state. In the first part of my talk, I will discuss our Hartree-Fock and time-dependent Hartree-Fock analysis of this correlated state. We identify it as an intervalley coherent antiferromagnet (IVC-AFM), whose stability and evolution with twist angle is primarily set by broadening-induced nesting and commensurability. I will discuss how this IVC-AFM can explain key aspects of the transport experiments. We also find that the IVC-AFM exhibits a strong magneto-electric coupling tunable by the range of the interactions, which controls the sharpness of the transition to the normal state. This magneto-electric coupling enhances the finite-momentum optical response generated by its spin waves, which is potentially accessible in near-field or on-chip THz spectroscopy. In the second part of my talk, I will introduce a formalism based on the real-space one-particle reduced density matrix that generates an optimal local basis and allows to quantify multiorbital (quantum geometric) effects on the form factors. This formalism shows that, despite its topological bands, quantum geometry does not play a primary role in the weak- to intermediate-coupling instabilities of twisted WSe2, which are governed by the dispersion.