|Description||2021 Fall Physics Colloquium Series|
Prof. Douglas Natelson
Chair, Department of Physics and Astronomy
Rice University, Houston, TX
Shot Noise to Examine What Transports Charge in Non-Fermi Liquids
There are intrinsic fluctuations in the electrical current driven through a conducting system because charge is transported in discrete quantities. Those fluctuations, "shot noise", provide a way of experimentally determining the effective charge of the current-carrying excitations. I will describe such measurements in tunneling structures made from an archetypal copper oxide superconductor. Remarkably, well above the superconducting transition temperature and at voltages large compared to the superconducting gap energy
scale, the noise significantly exceeds theoretical expectations for the tunneling of
single electronic charges, indicating pairing of charge carriers in the pseudogap regime of temperature and bias. Time permitting, I will also describe recent measurements of shot noise in a different non-Fermi liquid, a quantum critical "strange metal", where preliminary results again show deviations from the
expectations for noise in conventional metal structures.
Meet-the-Speaker Reception at 3:40 p.m.
Outdoor Patio D, between E and C wings
Presentation at 4:00 p.m., Room D.110
For more information contact: Dr. David Hilton, 254-710-2631