Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session M06: Ultrafast Phenomena in Solid-State
2:00 PM–3:48 PM,
Wednesday, June 7, 2023
Room: 206 A
Chair: Niranjan Shivaram, Purdue University
Abstract: M06.00004 : Ultrafast Laser-Driven Dynamics in Metal-Insulator Interface*
2:36 PM–2:48 PM
Presenter:
Abdallah AlShafey
(Ohio State University)
Authors:
Abdallah AlShafey
(Ohio State University)
Gerard McCaul
(Tulane University)
Yuan-Ming Lu
(Ohio State University)
Xu-Yan Jia
(Beihang University)
Shou-Shu Gong
(Beihang University)
Zachariah M Addison
(Ohio State University)
Denys I Bondar
(Tulane University)
Mohit Randeria
(Ohio State University)
Alexandra S Landsman
(Ohio State University)
We show that an increased coupling to the metal leads to an enhanced response, where the threshold field is significantly reduced, with dielectric breakdown occurring at much weaker fields. This is due to charge fluctuations induced by the metal, which result in a dramatically increased correlation length in the insulator. This is supported by independent DMRG calculations. The enhanced response also shows up clearly in the HHG spectrum, where the low-order harmonic intensity is increased by two orders of magnitude. We further examine a different phase of the system, a correlated band insulator, given by much stronger interfacial coupling. The response of this phase is inherently different from the MI interface; marked by a much weaker optical response, and an inverted dependence on the strength of electronic repulsions.
The applications of the results above are numerous, ranging from the advancement of memristor technology to the use of HHG as a spectroscopic probe, and for material characterization and identification.
*Center for Emergent Materials through NSF grant number DMR-2011876
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