scholarly journals Classification of collective modes in a charge density wave by momentum-dependent modulation of the electronic band structure

2015 ◽  
Vol 91 (20) ◽  
Author(s):  
D. Leuenberger ◽  
J. A. Sobota ◽  
S.-L. Yang ◽  
A. F. Kemper ◽  
P. Giraldo-Gallo ◽  
...  
Keyword(s):  
Band Structure ◽  
Charge Density ◽  
Charge Density Wave ◽  
Electronic Band Structure ◽  
Density Wave ◽  
Collective Modes ◽  
Electronic Band ◽  
A Charge

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 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.

Band Structures of Intercalation Compounds. The System (NH4)(NH3)3(TiS2)4

1987 ◽  
Vol 42 (11) ◽  
pp. 1346-1356
Author(s):  
Rafael Ramirez ◽  
Michael C. Böhm
Keyword(s):  
Experimental Data ◽  
Band Structure ◽  
Electronic Band Structure ◽  
Density Wave ◽  
Mean Field ◽  
Host Lattice ◽  
Electronic Charge ◽  
Electronic Band ◽  
Title System ◽  
A Charge

The electronic band structure of the intercalation system ammonia TiS2 has been investigated by a semiempirical self-consistent-field (SCF) Hartree-Fock (HF) crystal orbital (CO) formalism supplemented by an INDO (intermediate neglect of differential overlap) Hamiltonian. A two-dimensional (2D) model for the title system with stoichiometry (NH4)(NH3)3(TiS2)4 has been selected on the basis of available experimental data. The model is defined via a TiS2 monolayer coupled to the intercalant monolayer. The corresponding band-structure properties are compared with bandstructure calculations of monolayered TiS2 and bulk TiS2 . For TiS2 available experimental data and numerical results of conventional band-structure approaches are reported. The interaction between the guest-molecules and the host lattice has the character of a redox-process; i.e. one electron per formula unit has been transferred from the intercalant to the TiS2 layer. One consequence of this transfer is a semiconductor-to-metal transition upon intercalation; an additional consequence is a remarkable electronic reorganization in the TiS2 host. The surplus of electronic charge is predominantly localized at the S centers. The electronic states at the Fermi-level are of Ti 3d character. Two electronic configurations of the title system have been investigated. The mean-field ground state is of a charge density wave type with respect to the TiS2 sublattice. A “symmetry adapted” (SA) configuration is predicted at higher energy.

scholarly journals Atomic-scale strain manipulation of a charge density wave

2018 ◽  
Vol 115 (27) ◽  
pp. 6986-6990 ◽  
Author(s):  
Shang Gao ◽  
Felix Flicker ◽  
Raman Sankar ◽  
He Zhao ◽  
Zheng Ren ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Electronic Band ◽  
Simple Method ◽  
Wide Range ◽  
A Charge

A charge density wave (CDW) is one of the fundamental instabilities of the Fermi surface occurring in a wide range of quantum materials. In dimensions higher than one, where Fermi surface nesting can play only a limited role, the selection of the particular wavevector and geometry of an emerging CDW should in principle be susceptible to controllable manipulation. In this work, we implement a simple method for straining materials compatible with low-temperature scanning tunneling microscopy/spectroscopy (STM/S), and use it to strain-engineer CDWs in 2H-NbSe2. Our STM/S measurements, combined with theory, reveal how small strain-induced changes in the electronic band structure and phonon dispersion lead to dramatic changes in the CDW ordering wavevector and geometry. Our work unveils the microscopic mechanism of a CDW formation in this system, and can serve as a general tool compatible with a range of spectroscopic techniques to engineer electronic states in any material where local strain or lattice symmetry breaking plays a role.

scholarly journals Ultrafast formation of domain walls of a charge density wave in SmTe3

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
M. Trigo ◽  
P. Giraldo-Gallo ◽  
J. N. Clark ◽  
M. E. Kozina ◽  
T. Henighan ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Domain Walls ◽  
Density Wave ◽  
A Charge

Ultrafast switching to an insulating-like metastable state by amplitudon excitation of a charge density wave

2021 ◽  
Author(s):  
Naotaka Yoshikawa ◽  
Hiroki Suganuma ◽  
Hideki Matsuoka ◽  
Yuki Tanaka ◽  
Pierre Hemme ◽  
...  
Keyword(s):  
Charge Density ◽  
Metastable State ◽  
Charge Density Wave ◽  
Density Wave ◽  
Ultrafast Switching ◽  
A Charge

scholarly journals Ultrafast spot-profile LEED of a charge-density wave phase transition

2021 ◽  
Vol 118 (22) ◽  
pp. 221603
Author(s):  
G. Storeck ◽  
K. Rossnagel ◽  
C. Ropers
Keyword(s):  
Phase Transition ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Wave Phase ◽  
Charge Density Wave Phase ◽  
A Charge

An experimentalist's view of the galvanomagnetic and thermomagnetic properties of potassium

1982 ◽  
Vol 60 (5) ◽  
pp. 679-686 ◽  
Author(s):  
R. Fletcher
Keyword(s):  
Experimental Investigation ◽  
Charge Density ◽  
Charge Density Wave ◽  
High Field ◽  
Density Wave ◽  
The Other ◽  
Detailed Structure ◽  
Precise Nature ◽  
A Charge ◽  
Thermomagnetic Properties

This paper provides a brief survey of the experimental and theoretical situation regarding the galvano- and thermomagnetic properties of potassium viewed within the context of the behaviour of other metals. Most of the data are consistent with various sample imperfections as being the major source of the anomalies that are found. However, the precise nature of the imperfections and the mechanism by which the imperfections produce the anomalies are not yet known. It is argued that the recently discovered detailed structure in the high field induced torque of K should be subjected to intensive experimental investigation before drawing any conclusions with regards to the possible presence of a charge density wave; the other magnetotransport properties offer little evidence either for or against such a possibility.

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