Photoinduced collective mode, inhomogeneity, and melting in a charge-order system

Hitoshi Seo, Yasuhiro Tanaka, Sumio Ishihara

Research output: Contribution to journalArticle

Abstract

We theoretically investigate photoresponses of a correlated electron system upon stimuli of a pulsed laser light. Real-time dynamics of an interacting spinless fermion model on a one-dimensional chain, as a model of charge order (CO), are numerically simulated using the time-dependent Hartree-Fock method. In particular, we discuss the differences between two situations as the initial state: the homogeneous order and the presence of a domain wall, i.e., a kink structure embedded in the CO bulk. Coherent dynamics are seen in the former case: When the frequency of the pump light ωp is varied, along with single particle excitations across the CO gap (ΔCO), the resonantly-excited collective phase mode near ωp≃ΔCO/2 efficiently destabilizes CO. In clear contrast, in the latter case, when ωp is tuned at such in-gap frequencies and the intensity of light is sufficiently large, inhomogeneity spreads out from the kink to the bulk region through kink creations. Moreover, even stronger intensity induces the inhomogeneous melting of CO where the CO gap is destroyed.

Original languageEnglish
Article number235150
JournalPhysical Review B
Volume98
Issue number23
DOIs
Publication statusPublished - 2018 Dec 26
Externally publishedYes

Fingerprint

Melting
inhomogeneity
melting
Fermions
Domain walls
Pulsed lasers
stimuli
domain wall
pulsed lasers
fermions
Pumps
pumps
Electrons
excitation
electrons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Photoinduced collective mode, inhomogeneity, and melting in a charge-order system. / Seo, Hitoshi; Tanaka, Yasuhiro; Ishihara, Sumio.

In: Physical Review B, Vol. 98, No. 23, 235150, 26.12.2018.

Research output: Contribution to journalArticle

@article{3c1d62ec8fb943ee9755094ab815a9cd,
title = "Photoinduced collective mode, inhomogeneity, and melting in a charge-order system",
abstract = "We theoretically investigate photoresponses of a correlated electron system upon stimuli of a pulsed laser light. Real-time dynamics of an interacting spinless fermion model on a one-dimensional chain, as a model of charge order (CO), are numerically simulated using the time-dependent Hartree-Fock method. In particular, we discuss the differences between two situations as the initial state: the homogeneous order and the presence of a domain wall, i.e., a kink structure embedded in the CO bulk. Coherent dynamics are seen in the former case: When the frequency of the pump light ωp is varied, along with single particle excitations across the CO gap (ΔCO), the resonantly-excited collective phase mode near ωp≃ΔCO/2 efficiently destabilizes CO. In clear contrast, in the latter case, when ωp is tuned at such in-gap frequencies and the intensity of light is sufficiently large, inhomogeneity spreads out from the kink to the bulk region through kink creations. Moreover, even stronger intensity induces the inhomogeneous melting of CO where the CO gap is destroyed.",
author = "Hitoshi Seo and Yasuhiro Tanaka and Sumio Ishihara",
year = "2018",
month = "12",
day = "26",
doi = "10.1103/PhysRevB.98.235150",
language = "English",
volume = "98",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "23",

}

TY - JOUR

T1 - Photoinduced collective mode, inhomogeneity, and melting in a charge-order system

AU - Seo, Hitoshi

AU - Tanaka, Yasuhiro

AU - Ishihara, Sumio

PY - 2018/12/26

Y1 - 2018/12/26

N2 - We theoretically investigate photoresponses of a correlated electron system upon stimuli of a pulsed laser light. Real-time dynamics of an interacting spinless fermion model on a one-dimensional chain, as a model of charge order (CO), are numerically simulated using the time-dependent Hartree-Fock method. In particular, we discuss the differences between two situations as the initial state: the homogeneous order and the presence of a domain wall, i.e., a kink structure embedded in the CO bulk. Coherent dynamics are seen in the former case: When the frequency of the pump light ωp is varied, along with single particle excitations across the CO gap (ΔCO), the resonantly-excited collective phase mode near ωp≃ΔCO/2 efficiently destabilizes CO. In clear contrast, in the latter case, when ωp is tuned at such in-gap frequencies and the intensity of light is sufficiently large, inhomogeneity spreads out from the kink to the bulk region through kink creations. Moreover, even stronger intensity induces the inhomogeneous melting of CO where the CO gap is destroyed.

AB - We theoretically investigate photoresponses of a correlated electron system upon stimuli of a pulsed laser light. Real-time dynamics of an interacting spinless fermion model on a one-dimensional chain, as a model of charge order (CO), are numerically simulated using the time-dependent Hartree-Fock method. In particular, we discuss the differences between two situations as the initial state: the homogeneous order and the presence of a domain wall, i.e., a kink structure embedded in the CO bulk. Coherent dynamics are seen in the former case: When the frequency of the pump light ωp is varied, along with single particle excitations across the CO gap (ΔCO), the resonantly-excited collective phase mode near ωp≃ΔCO/2 efficiently destabilizes CO. In clear contrast, in the latter case, when ωp is tuned at such in-gap frequencies and the intensity of light is sufficiently large, inhomogeneity spreads out from the kink to the bulk region through kink creations. Moreover, even stronger intensity induces the inhomogeneous melting of CO where the CO gap is destroyed.

UR - http://www.scopus.com/inward/record.url?scp=85059505434&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85059505434&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.98.235150

DO - 10.1103/PhysRevB.98.235150

M3 - Article

VL - 98

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 23

M1 - 235150

ER -