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A gapless 1D spin liquid as a critical point between fragile Kondo insulators

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Kondo insulators acquire their incompressible character via a spin exchange coupling between itinerant charge carriers and local moments. Motivated by recent advances in tunable 2D materials, I will focus on a class of Kondo insulator models where both the bandwidth and the quantum geometry of the itinerant electrons can be tuned. I will then argue that already in the simplest such model interesting physics arises. In particular, I will present evidence that in a 1D model tuning the kinetic energy of the itinerant electrons drives a second order phase transition where the critical fluctuations are carried by the spin degrees of freedom. Moreover, the transition falls outside the usual Landau paradigm for symmetry-breaking transitions, and has connections to generalized Lieb-Schultz-Mattis obstructions.

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FW 11, Willam Gates Hall. Zoom link: https://cl-cam-ac-uk.zoom.us/j/4361570789?pwd=Nkl2T3ZLaTZwRm05bzRTOUUxY3Q4QT09&from=addon Riley Beves Room, King's College, Cambridge, CB2 1ST

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