Seminare der Theoretischen Physik

The coupling between electronic and nuclear degrees of freedom underpins many emergent phenomena in condensed matter systems. In this talk, we discuss the dynamics of nuclear motion and quantum geometric effects in electron-nuclear coupling, illustrated through examples from charge density waves (CDWs) and driven quantum materials. First, we demonstrate how nuclear quantum and thermal fluctuations influence CDW physics in two-dimensional materials. Second, we explore how the driving of circular phonons can generate giant pseudomagnetic fields. We describe a coupling mechanism between electronic and nuclear angular momenta rooted in electron-nuclear quantum geometry. Using SrTiO3 as a prototype, we show how this coupling induces transient orbital splittings through circularly driven phonon modes, paving the way for novel approaches to dynamically controlled magnetism. These insights are enabled by an ab initio electron-lattice downfolding scheme, which enhances the efficiency of simulations of electronic properties, nuclear motion, and their interplay by several orders of magnitude.


	Januar 2026

Di	13.01.2026 Seminarraum 3, A.03.101 Theoretische Physik
14:15	Theoretisch-physikalisches Seminar - Dienstag Tim Wehling The Electron-Nuclear Interplay: Charge Density Waves and Ultrafast Quantum Geometric Effects Abstract The coupling between electronic and nuclear degrees of freedom underpins many emergent phenomena in condensed matter systems. In this talk, we discuss the dynamics of nuclear motion and quantum geometric effects in electron-nuclear coupling, illustrated through examples from charge density waves (CDWs) and driven quantum materials. First, we demonstrate how nuclear quantum and thermal fluctuations influence CDW physics in two-dimensional materials. Second, we explore how the driving of circular phonons can generate giant pseudomagnetic fields. We describe a coupling mechanism between electronic and nuclear angular momenta rooted in electron-nuclear quantum geometry. Using SrTiO3 as a prototype, we show how this coupling induces transient orbital splittings through circularly driven phonon modes, paving the way for novel approaches to dynamically controlled magnetism. These insights are enabled by an ab initio electron-lattice downfolding scheme, which enhances the efficiency of simulations of electronic properties, nuclear motion, and their interplay by several orders of magnitude. Kontakt: Theoretische Physik


	Februar 2026

Do	12.02.2026 Institute for Theoretical Physics/SR 3 A03.101 Theoretische Physik
14:15	Seminar Statistical Physics Jaskaran Singh Göttingen tba Kontakt: Peter Sollich