scholarly journals Coherent dynamics of the charge density wave gap in tritellurides

2014 ◽  
Vol 171 ◽  
pp. 299-310 ◽  
Author(s):  
L. Rettig ◽  
J.-H. Chu ◽  
I. R. Fisher ◽  
U. Bovensiepen ◽  
M. Wolf
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Coherent Control ◽  
Energy Gap ◽  
Electronic Band Structure ◽  
Density Wave ◽  
Electronic Band ◽  
Strongly Coupled ◽  
Pulse Pump ◽  
Amplitude Mode

The dynamics of the transient electronic structure in the charge density wave (CDW) system RTe3 (R = rare-earth element) is studied using time- and angle-resolved photoemission spectroscopy (trARPES). Employing a three-pulse pump–probe scheme we investigate the effect of the amplitude mode oscillations on the electronic band structure and, in particular, on the CDW energy gap. We observe coherent oscillations in both lower and upper CDW band with opposite phases, whereby two dominating frequencies are modulating the CDW order parameter. This demonstrates the existence of more than one collective amplitude mode, in contrast to a simple Peierls model. Coherent control experiments of the two amplitude modes, which are strongly coupled in equilibrium, demonstrate independent control of the modes suggesting a decoupling of both modes in the transient photoexcited state.

scholarly journals Electronic band structure and charge density wave transition in quasi-2D KMo6O17purple bronze

2008 ◽  
Vol 100 (7) ◽  
pp. 072021
Author(s):  
M A Valbuena ◽  
J Avila ◽  
D V Vyalikh ◽  
H Guyot ◽  
C Laubschat ◽  
...  
Keyword(s):  
Band Structure ◽  
Charge Density ◽  
Charge Density Wave ◽  
Electronic Band Structure ◽  
Density Wave ◽  
Electronic Band

scholarly journals Raman scattering evidence for a cascade evolution of the charge-density-wave collective amplitude mode

2010 ◽  
Vol 81 (8) ◽  
Author(s):  
M. Lavagnini ◽  
H.-M. Eiter ◽  
L. Tassini ◽  
B. Muschler ◽  
R. Hackl ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Amplitude Mode

Tunneling investigation of charge density wave energy gap in IT-TaS2

Physica B+C ◽  
1983 ◽  
Vol 117-118 ◽  
pp. 590-592 ◽  
Author(s):  
H. Ozaki ◽  
T. Mutoh ◽  
H. Ohshima ◽  
A. Okubora ◽  
N. Yamagata
Keyword(s):  
Charge Density ◽  
Wave Energy ◽  
Charge Density Wave ◽  
Energy Gap ◽  
Density Wave

scholarly journals Charge Density Wave and Narrow Energy Gap at Room Temperature in 2D Pb3–xSb1+xS4Te2−δ with Square Te Sheets

2017 ◽  
Vol 139 (32) ◽  
pp. 11271-11276 ◽  
Author(s):  
Haijie Chen ◽  
Christos D. Malliakas ◽  
Awadhesh Narayan ◽  
Lei Fang ◽  
Duck Young Chung ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Room Temperature ◽  
Energy Gap ◽  
Density Wave

scholarly journals Evidence for strongly coupled charge-density-wave ordering in three-dimensionalR5Ir4Si10compounds from optical measurements

2009 ◽  
Vol 80 (3) ◽  
Author(s):  
Riccardo Tediosi ◽  
Fabrizio Carbone ◽  
A. B. Kuzmenko ◽  
J. Teyssier ◽  
D. van der Marel ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Optical Measurements ◽  
Strongly Coupled

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.

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