报告人｜ Dr. Manuel Weber

                 Technical University of Munich

时    间｜2026年4月13日 14：30

地    点｜科技楼602

Abstract: Electron-phonon interactions are fundamental to quantum materials and lead to a variety of correlated phenomena like the formation of polarons, superconductivity, or charge order. In this talk, I want to discuss how a coupling to phonons can be used to study exotic quantum criticality. To this end, I will reconsider two fundamental models in one-dimensional physics using large-scale quantum Monte Carlo simulations: First, I will consider the Su-Schrieffer-Heeger model and show how quantum lattice fluctuations can induce novel orders beyond the Peierls instability. In particular, we find a direct order-to-order transition beyond the Landau paradigm that is solely driven by retardation. Second, I will revisit the phase diagram of the Hubbard-Holstein model which has been discussed controversially for many years. I discover a novel intermediate bond-ordered phase that is reminiscent of the extended Hubbard model and is accompanied by a nontrivial order-to-order transition. All in all, this work shows how quantum lattice fluctuations can be a source for complex phenomena in correlated systems.

Manuel Weber obtained his PhD in 2018 from the University of Würzburg where he worked with Martin Hohenadler and Fakher Assaad. From 2018 to 2020, he was a postdoc at Georgetown University working with James Freericks. From 2020 to 2022, he was a guest scientist at the Max Planck Institute for the Physics of Complex Systems in Dresden in the group of David Luitz. Since 2022, he is a postdoc at TU Dresden in the group of Matthias Vojta.

邀请人：郭文安教授