Photoinduced Enhancement of Excitonic Order

Physical Review Letters
Yuta MurakamiPhilipp Werner

Abstract

We study the dynamics of excitonic insulators coupled to phonons using the time-dependent mean-field theory. Without phonon couplings, the linear response is given by the damped amplitude oscillations of the order parameter with a frequency equal to the minimum band gap. A phonon coupling to the interband transfer integral induces two types of long-lived collective oscillations of the amplitude, one originating from the phonon dynamics and the other from the phase mode, which becomes massive. We show that, even for small phonon coupling, a photoinduced enhancement of the exciton condensation and the gap can be realized. Using the Anderson pseudospin picture, we argue that the origin of the enhancement is a cooperative effect of the massive phase mode and the Hartree shift induced by the photoexcitation. We also discuss how the enhancement of the order and the collective modes can be observed with time-resolved photoemission spectroscopy.

References

Apr 12, 2006·Physical Review Letters·Emil A YuzbashyanBoris L Altshuler
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Apr 16, 2013·Physical Review Letters·Naoto TsujiPhilipp Werner
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Citations

Dec 6, 2019·Nature Communications·Philipp WernerGil Refael
Jun 30, 2018·Physical Review Letters·Koudai SugimotoYukinori Ohta
Dec 7, 2019·Physical Review Letters·Keisuke FukutaniHan Woong Yeom
Apr 24, 2019·Physical Review Letters·Giacomo Mazza, Antoine Georges
May 30, 2020·Physical Review Letters·Giacomo MazzaAntoine Georges
Nov 6, 2018·Nature Communications·Jiajun LiMartin Eckstein
Dec 2, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Bommareddy PoojithaSurajit Saha
Jan 16, 2021·Physical Review Letters·H NingD Hsieh
Jan 9, 2021·Physical Review Letters·Denis GoležAndrew J Millis
Jun 28, 2019·Inorganic Chemistry·Jian YanYuping Sun

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