USC Physics Seminars

                                   Quantum Information – Condensed Matter – Biophysics




These seminars are scheduled on Fridays at 2:00pm, and the location is SSC 319, unless otherwise noted. Some of the seminars will be held jointly with UCLA and CALTECH.
For more information contact Lorenzo Campos Venuti (condensed matter) or Ben Reichardt (quantum information). Biophysics seminars are held the first Friday of each month and are indicated in blue.
UPC seminar location: Ahmanson Center for Biological Research, ACB 238. Location for remote viewing of HSC seminars: ACB 238
HSC seminar location: Herklotz seminar room, Zilkha Neurogenetic Institute HSC.  Location for remote viewing of UPC seminars: Herklotz



Friday, September 27, 2pm SSC 319

Nicholas Breznay (Harvey Mudd College)
Using phase-coherent transport to uncover new electronic phenomena in quantum materials

Understanding the driving mechanisms for quantum materials – whether strongly correlated, strongly disordered, or characterized by nontrivial band topology – often derives from precise studies of electronic phase coherence. Among other impacts, long electronic spin and phase-coherence lifetimes result in weak localization or (in the presence of strong spin-orbit coupling) antilocalization. These transport phenomena can be used to spectroscopically probe complex materials, including the interface between perovskite oxide materials, and phase-change chacogenide glasses. First, we examine thin-film bilayers of BaPbO3 on BaBiO3, an oxide system that (like LAO-STO) exhibits superconductivity at the interface. The bilayer films exhibit quantum interference phenomena below 100 K and show an enhanced dephasing rate over a broad range of temperatures (2-50 K). Increased dephasing may be linked to instabilities that have been proposed to drive unconventional superconductivity in the bismuthates and demonstrates that the BPO-BBO interface hosts a complex electronic system. Second, we find an unexpected spin sensitive hopping conductivity in the phase change material SnSb2Te4. Here, an isotropic magnetoconductance arises from disruption of spin correlations that inhibit hopping transport, a recently hypothesized ‘spin memory’ effect whose occurrence signals that the spin plays a previously overlooked role in the disorder-driven transition between weak and strong localization in spin-orbital materials.
















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