Photoinduced Hund excitons in the breakdown of a two-orbital Mott insulator

Rincon, Julian; Dagotto, Elbio R.; Feiguin, Adrian E.

doi:10.1103/physrevb.97.235104

Photoinduced Hund excitons in the breakdown of a two-orbital Mott insulator

Journal Article · Tue Jun 05 00:00:00 EDT 2018 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.97.235104· OSTI ID:1440810

Rincon, Julian ^[1]; Dagotto, Elbio R. ^[2]; Feiguin, Adrian E. ^[3]

Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada)
The Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Northeastern Univ., Boston, MA (United States)

We study the photoinduced breakdown of a two-orbital Mott insulator and resulting metallic state. Using time-dependent density matrix renormalization group, we scrutinize the real-time dynamics of the half-filled two-orbital Hubbard model interacting with a resonant radiation field pulse. The breakdown, caused by production of doublon-holon pairs, is enhanced by Hund's exchange, which dynamically activates large orbital fluctuations. The melting of the Mott insulator is accompanied by a high to low spin transition with a concomitant reduction of antiferromagnetic spin fluctuations. Most notably, the overall time response is driven by the photogeneration of excitons with orbital character that are stabilized by Hund's coupling. These unconventional “Hund excitons” correspond to bound spin-singlet orbital-triplet doublon-holon pairs. We study exciton properties such as bandwidth, binding potential, and size within a semiclassical approach. In conclusion, the photometallic state results from a coexistence of Hund excitons and doublon-holon plasma.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725; SC0014407

OSTI ID:: 1440810

Alternate ID(s):: OSTI ID: 1440382

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 23 Vol. 97; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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