«Kharkiv Quantum Seminar» invites you to the next lecture, which will take place on June 9, 2026, at 16:00 online.
Lecturer: Joseph Thywissen — University of Toronto, Canada.
Lecture topic: «Saturated Collisional Resistivity in Ultracold Hubbard Metals».
Abstract: Optical lattices provide clean periodic potentials for ultracold neutral fermions. Without phonons or impurity scattering, finite resistivity arises solely due to interactions between delocalized atoms. We investigate this mechanism in a cubic lattice with tunable s-wave interactions and variable temperature. In the strongly interacting metallic regime, we observe remarkable saturation of the current relaxation rate to a value independent of interaction strength. Is this a signature of “lattice unitarity”? By comparing with a calculation of resistivity based on the renormalized two-particle scattering matrix, we perform a comparative analysis of the kinetic model of this metallic state within the Hubbard model and find that the unitary regime is not reached even in the limit of infinite scattering length.
About the lecturer: Joseph Thywissen is a professor of physics at the University of Toronto and a senior fellow at Massey College. He earned his PhD at Harvard University in 2000, then spent two years as a postdoctoral researcher at the Institute of Optics (France) in Alain Aspect’s group. In 2003, Prof. Thywissen joined the University of Toronto to establish an experimental research group using ultracold neutral atoms to study quantum many-body physics. He has held leadership roles such as member of the executive committee of the American Physical Society Division, chair of the Canadian Association of Physicists Division, and member of the governing board of Massey College. Among his honors are fellowships of the American Physical Society (APS), Optica, membership in the Canadian Research Chair program, and the John Charles Polanyi Prize in Physics.
Event organizers: B.I. Verkin Institute for Low Temperature Physics and Engineering of the NAS of Ukraine (Doctor of Physical and Mathematical Sciences Serhii Shevchenko) and National Science Center «Kharkiv Institute of Physics and Technology» (Corresponding Member of the NAS of Ukraine Andrii Sotnikov).
Conference ID: 84858248436
Conference code: 929397
Information provided by the B.I. Verkin Institute for Low Temperature Physics and Engineering of the NAS of Ukraine