Lattice Vibrations in the Charge-Density-Wave States of Layered Transition Metal Dichalcogenides

1985 ◽  
Vol 129 (1) ◽  
pp. 13-39 ◽  
Author(s):  
S. Sugai
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Transition Metal Dichalcogenides ◽  
Lattice Vibrations ◽  
Metal Dichalcogenides ◽  
Wave States ◽  
Layered Transition Metal

scholarly journals A potential all-electronic route to the charge-density-wave phase in monolayer vanadium diselenide

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Matthew J. Trott ◽  
Chris A. Hooley
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Transition Metal Dichalcogenides ◽  
Coulomb Repulsion ◽  
Lattice Vibrations ◽  
Heisenberg Exchange ◽  
Low Energies ◽  
Metal Dichalcogenides ◽  
Charge Density Wave Phase

AbstractThe transition metal dichalcogenides offer significant promise for the tunable realisation and application of correlated electronic phases. However, tuning their properties requires an understanding of the physical mechanisms underlying their experimentally observed ordered phases, and in particular the extent to which lattice vibrations are a necessary ingredient. Here we present a potential mechanism for charge-density-wave formation in monolayers of vanadium diselenide in which the key role at low energies is played by a combination of electron–electron interactions and nesting. There is a competition between superconducting and density-wave fluctuations as sections of the Fermi surface are tuned to perfect nesting. This competition leads to charge-density-wave order when the effective Heisenberg exchange interaction is comparable to the effective Coulomb repulsion. When all effective interactions are purely repulsive, it results instead in d-wave superconductivity. We discuss the possible role of lattice vibrations in enhancing the effective Heisenberg exchange during the earlier stages of the renormalisation group flow.

Epitaxial Growth and Charge Density Wave of TaSe2

1991 ◽  
Vol 230 ◽  
Author(s):  
Toshihiro Shimada ◽  
Fumio S. Ohuchi ◽  
Bruce A. Parkinson
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Epitaxial Growth ◽  
Ultrathin Films ◽  
Charge Density Wave ◽  
Density Wave ◽  
Transition Metal Dichalcogenides ◽  
Charge Density Waves ◽  
Density Waves ◽  
Metal Dichalcogenides

AbstractWe report an epitaxial growth of TaSe2, a family of transition metal dichalcogenides that exhibit Charge Density Waves (CDW). The films that have been characterized with RHEED, LEED, XPS and STM showed two different phases. Occurrence of CDW in the ultrathin films has been detected by XPS and LEED.

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