scholarly journals Photoinduced Dynamics of Commensurate Charge Density Wave in 1T-TaS2 Based on Three-Orbital Hubbard Model

2018 ◽  
Vol 9 (1) ◽  
pp. 70 ◽  
Author(s):  
Tatsuhiko Ikeda ◽  
Hirokazu Tsunetsugu ◽  
Kenji Yonemitsu
Keyword(s):  
Laser Pulse ◽  
Charge Density ◽  
Laser Irradiation ◽  
Charge Density Wave ◽  
Lattice Distortion ◽  
Ultrashort Laser Pulse ◽  
Density Wave ◽  
Layered Compound ◽  
Coupled Equations ◽  
Ultrashort Laser

We study the coupled charge-lattice dynamics in the commensurate charge density wave (CDW) phase of the layered compound 1T-TaS 2 driven by an ultrashort laser pulse. For describing its electronic structure, we employ a tight-binding model of previous studies including the effects of lattice distortion associated with the CDW order. We further add on-site Coulomb interactions and reproduce an energy gap at the Fermi level within a mean-field analysis. On the basis of coupled equations of motion for electrons and the lattice distortion, we numerically study their dynamics driven by an ultrashort laser pulse. We find that the CDW order decreases and even disappears during the laser irradiation while the lattice distortion is almost frozen. We also find that the lattice motion sets in on a longer time scale and causes a further decrease in the CDW order even after the laser irradiation.

P4W20O68: A complex charge-density-wave modulated structure with an antiferroelectric-like lattice distortion

2000 ◽  
Vol 62 (1) ◽  
pp. 176-188 ◽  
Author(s):  
P. Roussel ◽  
Ph. Labbé ◽  
H. Leligny ◽  
D. Groult ◽  
P. Foury-Leylekian ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Lattice Distortion ◽  
Density Wave ◽  
Modulated Structure

√3 × 2 and √3 × √7 Charge Density Wave Driven by Lattice Distortion in Monolayer VSe2

2020 ◽  
Vol 76 (5) ◽  
pp. 412-415 ◽  
Author(s):  
Trinh Thi Ly ◽  
Ganbat Duvjir ◽  
Nguyen Huu Lam ◽  
Jungdae Kim ◽  
Byoung Ki Choi ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Lattice Distortion ◽  
Density Wave

Dispersion of superconducting gap excitations in layered charge density wave systems

1983 ◽  
Vol 61 (8) ◽  
pp. 1160-1168 ◽  
Author(s):  
G. C. Mahanty ◽  
S. N. Behera
Keyword(s):  
Charge Density ◽  
Spectral Function ◽  
Charge Density Wave ◽  
Energy Gap ◽  
Density Wave ◽  
Exact Expression ◽  
Experimental Result ◽  
Layered Compound ◽  
Present Calculation ◽  
Peak Structure

The phonon spectral function for charge density wave (CDW) systems in the superconducting (SC) phase is calculated for finite wave vectors (q). An exact expression for the q dependent phonon self-energy is obtained. The analysis is carried out with a small q limit. The spectral function shows a two peak structure for frequencies co less than the SC energy gap (2Δ) in contrast to the single peak obtained by Balseiro and Falicov for q = 0. The peaks approach each other with increasing q and finally merge into one. Both modes have linear dispersions for small q and the frequency of the low-lying one goes to zero as q → 0. For ω > 2Δ the phonon spectrum does not change significantly. The results are discussed in context with the Raman scattering observation of SC gap excitations in 2H–NbSc2 (a layered compound exhibiting both CDW and SC transitions) by Sooryakumar and Klein. The present calculation demands that the strength of coupling between the CDW phonon and SC electrons be an order of magnitude smaller than that used for q = 0 in order to get an agreement with the experimental result.

scholarly journals Microscopic evidence for strong periodic lattice distortion in two-dimensional charge-density wave systems

2014 ◽  
Vol 89 (16) ◽  
Author(s):  
Jixia Dai ◽  
Eduardo Calleja ◽  
Jacob Alldredge ◽  
Xiangde Zhu ◽  
Lijun Li ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Lattice Distortion ◽  
Density Wave ◽  
Periodic Lattice ◽  
Two Dimensional ◽  
Microscopic Evidence

Periodic lattice distortion accompanying the charge-density-wave transition for Sn/Ge(111)

1999 ◽  
Vol 60 (4) ◽  
pp. 2860-2863 ◽  
Author(s):  
Jiandi Zhang ◽  
Ismail ◽  
P. J. Rous ◽  
A. P. Baddorf ◽  
E. W. Plummer
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Lattice Distortion ◽  
Density Wave ◽  
Periodic Lattice

Periodic lattice distortion accompanying the(3×3)charge-density-wave phase of Sn/Ge(111)

1998 ◽  
Vol 57 (8) ◽  
pp. 4579-4583 ◽  
Author(s):  
A. P. Baddorf ◽  
V. Jahns ◽  
Jiandi Zhang ◽  
J. M. Carpinelli ◽  
E. W. Plummer
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Lattice Distortion ◽  
Density Wave ◽  
Periodic Lattice ◽  
Wave Phase ◽  
Charge Density Wave Phase

scholarly journals Nonequilibrium “Melting” of a Charge Density Wave Insulator via an Ultrafast Laser Pulse

2014 ◽  
Vol 112 (17) ◽  
Author(s):  
Wen Shen ◽  
Yizhi Ge ◽  
A. Y. Liu ◽  
H. R. Krishnamurthy ◽  
T. P. Devereaux ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Ultrafast Laser ◽  
Ultrafast Laser Pulse ◽  
A Charge
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