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Hundness in twisted bilayer graphene: correlated gaps and pairing

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arxiv 2412.03108 v1 pith:22CCUSLS submitted 2024-12-04 cond-mat.str-el cond-mat.mes-hall

Seongyeon Youn , Beomjoon Goh , Geng-Dong Zhou , Zhi-Da Song , Seung-Sup B. Lee This is my paper
classification cond-mat.str-elcond-mat.mes-hall
keywords lesssimbilayerdynamicalgraphenehundnesspairingtwistedanti-hund
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abstract

We characterize gap-opening mechanisms in the topological heavy fermion (THF) model of magic-angle twisted bilayer graphene (MATBG), with and without electron-phonon coupling, using dynamical mean-field theory (DMFT) with the numerical renormalization group (NRG) impurity solver. In the presence of symmetry breaking associated with valley-orbital ordering (time-reversal-symmetric or Kramers intervalley coherent, or valley polarized), spin anti-Hund and orbital-angular-momentum Hund couplings, induced by the dynamical Jahn-Teller effect, result in a robust pseudogap at filling $2 \lesssim |\nu| \lesssim 2.5$. We also find that Hundness enhances the pairing susceptibilities for $1.6 \lesssim |\nu| \lesssim 2.8$, which might be a precursor to the superconducting phases neighboring $|\nu| = 2$.

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Cited by 3 Pith papers

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