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High Harmonic Generation in a Correlated Electron System.

Shohei Imai1, Atsushi Ono1, Sumio Ishihara1

  • 1Department of Physics, Tohoku University, Sendai 980-8578, Japan.

Physical Review Letters
|May 2, 2020
PubMed
Summary
This summary is machine-generated.

We discovered high harmonic generation signals from many-body states in correlated electron systems. These signals, arising from kink-antikink excitations, show threshold behavior with light amplitude.

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Area of Science:

  • Condensed matter physics
  • Quantum optics
  • Materials science

Background:

  • Previous studies on high harmonic generation (HHG) in solids relied on single-electron band structures.
  • The role of electron-electron interactions in HHG within correlated systems was not well understood.

Purpose of the Study:

  • To investigate the emergence of HHG signals from many-body state dynamics.
  • To explore HHG in a low-dimensional correlated electron system.
  • To understand the underlying mechanisms of HHG in such systems.

Main Methods:

  • Analysis of an interacting fermion model.
  • Effective pseudospin model on a one-dimensional dimer-type lattice.
  • Examination of a spontaneously symmetry-broken state with polarized charge densities.

Main Results:

  • Observed HHG signals attributed to many-body dynamics, not just one-body effects.
  • Demonstrated threshold behavior of HHG signals with respect to light amplitude.
  • Interpreted HHG signals via tunneling and recombination of kink-antikink excitations.

Conclusions:

  • Many-body effects significantly influence high harmonic generation in correlated electron systems.
  • The observed phenomena provide new insights into light-matter interactions in low-dimensional materials.
  • Kink-antikink excitation dynamics offer a novel mechanism for understanding HHG in specific lattice structures.