Stability Conditions for the Solutions of the Hartree-Fock Equations for Atomic and Molecular Systems. VI. Singlet-Type Instabilities and Charge-Density-Wave Hartree-Fock Solutions for Cyclic Polyenes

1970 ◽  
Vol 2 (6) ◽  
pp. 2268-2283 ◽  
Author(s):  
J. Paldus ◽  
J. Čižek
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Stability Conditions ◽  
Molecular Systems ◽  
Hartree Fock ◽  
Cyclic Polyenes

EXCITONIC CHARGE-DENSITY WAVE: A NOVEL PHASE OF DOUBLE QUANTUM WELL SYSTEMS

1992 ◽  
Vol 06 (03) ◽  
pp. 145-149
Author(s):  
X.M. CHEN ◽  
J.J. QUINN
Keyword(s):  
Charge Density ◽  
Quantum Wells ◽  
Charge Density Wave ◽  
Density Wave ◽  
Double Quantum ◽  
Electron Hole ◽  
Wave State ◽  
Hartree Fock ◽  
Double Quantum Well ◽  
Double Charge

Theoretical studies of collective excitations of double quantum wells (DQW’s) in a strong magnetic field indicate that the systems undergo a phase transition when the well separation is larger than a critical value. For electron-hole DQW’s, we find that in the Hartree-Fock approximation this transition generates a novel excitonic density wave state, which has a lower energy than either a homogeneous excitonic fluid or a double charge-density wave state.

Incommensurate modulated phases of the NbxTa1-xTe4 charge density wave system

1992 ◽  
Vol 50 (1) ◽  
pp. 58-59
Author(s):  
S. Ritchie ◽  
J. C. Bennett ◽  
A. Prodan ◽  
F.W. Boswell ◽  
J.M. Corbett
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Direct Evidence ◽  
Density Wave ◽  
Wave System ◽  
Modulated Phases ◽  
Metal Atoms ◽  
Incommensurate Modulation ◽  
End Members ◽  
Modulation Wave Vector

A continuous sequence of compounds having composition NbxTa1-xTe4; 0 ≤ x ≤ 1 have been studied by electron diffraction and microscopy. Previous studies have shown that the end members of the series, TaTε4 and NbTε4 possess a quasi-one-dimensional character and exhibit charge density wave (CDW) distortions. In these compounds, the subcell structure is tetragonal with axes (a × a × c) and consists of the metal atoms (Nb or Ta) centered within an extended antiprismatic cage of Te atoms. At room temperature, TaTε4 has a commensurate modulation structure with a 2a × 2a × 3c unit cell. In NbTε4, an incommensurate modulation with × ∼ 16c axes is observed. Preliminary studies of the mixed compounds NbxTα1-xTε4 showed a discontinuous jump of the modulation wave vector commensurate to incommensurate when the Nb dopant concentration x, exceeded x ≃ 0.3, In this paper, the nature of the compositional dependence of is studied in greater detail and evidence is presented for a stepwise variation of . This constitutes the first direct evidence for a Devil's staircase in CDW materials.

Wave Analysis of the Charge Density Wave Dynamics in the Molecular Conductor (Perylene)2Pt(mnt)2 (mnt=maleonitriledithiolate)

1995 ◽  
Vol 5 (5) ◽  
pp. 539-545 ◽  
Author(s):  
J. Dumas ◽  
N. Thirion ◽  
M. Almeida ◽  
E. B. Lopes ◽  
M. J. Matos ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Wave Analysis ◽  
Wave Dynamics ◽  
Molecular Conductor

Tunneling spectroscopy in the Charge-Density Wave conductor NbSe3

2004 ◽  
Vol 114 ◽  
pp. 135-136 ◽  
Author(s):  
E. Slot ◽  
K. O'Neill ◽  
H. S.J. van der Zant ◽  
R. E. Thorne
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Tunneling Spectroscopy

CHARGE DENSITY WAVE DYNAMICS IN THE INCOMMENSURATE AND COMMENSURATE TaS3

1983 ◽  
Vol 44 (C3) ◽  
pp. C3-1639-C3-1645 ◽  
Author(s):  
P. Monceau ◽  
H. Salva ◽  
Z. Z. Wang
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Wave Dynamics
Sign in / Sign up

Export Citation Format

Share Document