Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 92: Transport – Poster

TT 92.13: Poster

Thursday, March 12, 2026, 18:00–20:00, P4

QMC study of heat transport in 2D Dirac materials — •Luis Thremer¹, Adrien Reingruber¹, Maksim Ulybyshev¹, and Fakher F. Assaad^1,2 — ¹Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany — ²Würzburg-Dresden Cluster of Excellence ct.qmat, Am Hubland, Würzburg, Germany

Strongly correlated systems can host varying (and often competing) scattering mechanisms, making them an ideal playground for studying their influence on various transport properties. In particular, Dirac systems can undergo a Gross-Neveu phase transition, switching from a semi-metallic to a Mott-insulating phase. Experimental evidence of this transition was long-sought and recently tentatively realised in experiments on twisted WSe₂ tetralayers. We investigate the heat transport and the behaviour of the heat conductivity across the Gross-Neveu phase transition in strongly correlated 2D Dirac materials. In particular, we focus on their dependence on the change in the nature of the low-lying excitations from electrons to antiferromagnetic spin waves, which occurs across the phase transition. For this study, we use unbiased quantum Monte Carlo and Kubo linear response theory to extract the transport coefficients from the Euclidean time correlators. We also investigate the effects of long-range Coulomb interaction on the heat transport. Since long range interaction leads to the appearance of non-local terms in the heat current, long range Coulomb interaction can potentially significantly alter the thermal-transport behaviour.

Keywords: Thermal conductivity; Quantum Monte Carlo; 2D Dirac materials; Linear Response