Seminars
Seminars occur on Wednesdays from 12:00-1:00 PM Pacific in ISB 130 with a hybrid option over Zoom unless otherwise posted. To join the mailing list, please contact Prof. Ehsan Khatami at ehsan.khatami@sjsu.edu with the words "Seminars and Events" included in the subject heading.
This Week
Kinetic Ferromagnetism in a System of Strongly Interacting Lattice Electrons
Ehsan Khatami and Robin Newby, San Jose State University
Wednesday, 2/19/2025, 12:00-1:00pm Pacific
Abstract: Nearly 60 years ago, Nagaoka proved that a single dopant in an otherwise half-filled system of lattice electrons that experience strong repulsive interaction can bring about ferromagnetism through kinetic means. The phenomenon was recently observed with ultracold atoms in triangular optical lattices. In this talk, we will give a quick summary of the experimental findings, including the emergence of Nagaoka polarons as extended ferromagnetic bubbles around dopants, and present theory results obtained in the group in support of these observations on both the square and triangular lattice geometries.
Bio: Robin Newby is a former MS student in the SJSU Physics and Astronomy Department. They received their BS in Physics at Santa Clara University in 2020, where they were also engaged in experimental research on ultrafast pump-probe spectroscopy of semiconductors, leading to a 2018 paper they co-authored. At SJSU, Robin performed computational research in the field of strongly-correlated electronic systems under the supervision of Dr. Khatami. They are the lead author on a recent paper in the group on kinetic ferromagnetism in the square lattice.