Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B62: Quantum Many Body Systems & Methods I
11:30 AM–2:18 PM,
Monday, March 6, 2023
Room: Room 417
Sponsoring
Unit:
DCOMP
Chair: Jack Wells, Nvidia
Abstract: B62.00014 : Planckian scaling of the optical conductivity in the 2D Hubbard model
2:06 PM–2:18 PM
Presenter:
Maxence Grandadam
(Memorial University of Newfoundland)
Authors:
Maxence Grandadam
(Memorial University of Newfoundland)
James LeBlanc
(Memorial Univ of Newfoundland)
The resulting optical conductivity is obtained at different temperatures at the leading order and its non-trivial frequency dependence is analysed through the lens of an extended Drude model by introducing a frequency-dependent scattering time and mass enhancement. We recover the linear temperature dependence of the dc resistivity that has been observed in previous work. Additionally, we show that the optical conductivity presents a regime of power-law scaling at intermediate frequencies. This scaling satisfies a "Planckian"-like behaviour similar to the one expected in the strange metal regime of non-fermi liquids and reported in experiments. Extensions to include higher-order effects such as the vertex corrections to the longitudinal conductivity do not destroy this behaviour and are also discussed.
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