Optical properties of charge-density-wave ground states for inversion layers in many-valley semiconductors

1977 ◽  
Vol 15 (4) ◽  
pp. 1983-1987 ◽  
Author(s):  
M. J. Kelly ◽  
L. M. Falicov
Keyword(s):  
Optical Properties ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Ground States

Optical properties of the charge-density-wave compoundCeTe2

2008 ◽  
Vol 78 (13) ◽  
Author(s):  
K. E. Lee ◽  
C. I. Lee ◽  
H. J. Oh ◽  
M. A. Jung ◽  
B. H. Min ◽  
...  
Keyword(s):  
Optical Properties ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave

scholarly journals Optical properties of the Ce and La ditelluride charge density wave compounds

2007 ◽  
Vol 75 (20) ◽  
Author(s):  
M. Lavagnini ◽  
A. Sacchetti ◽  
L. Degiorgi ◽  
K. Y. Shin ◽  
I. R. Fisher
Keyword(s):  
Optical Properties ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave

scholarly journals Pressure dependence of the optical properties of the charge-density-wave compoundLaTe2

2008 ◽  
Vol 77 (16) ◽  
Author(s):  
M. Lavagnini ◽  
A. Sacchetti ◽  
L. Degiorgi ◽  
E. Arcangeletti ◽  
L. Baldassarre ◽  
...  
Keyword(s):  
Optical Properties ◽  
Charge Density ◽  
Pressure Dependence ◽  
Charge Density Wave ◽  
Density Wave

Layered tungsten bronzes: Tuning the optical properties by changing the layer thickness

2002 ◽  
Vol 12 (9) ◽  
pp. 361-361
Author(s):  
J. L. Musfeldt ◽  
Z. T. Zhu ◽  
Z. S. Teweldemedhin ◽  
M. Greenblatt
Keyword(s):  
Optical Properties ◽  
Charge Density ◽  
Layer Thickness ◽  
Charge Density Wave ◽  
Variable Temperature ◽  
Density Wave ◽  
Low Frequency ◽  
Gap Formation ◽  
Octahedral Layer ◽  
Charge Localization

We investigated the optical properties of a series of monophosphate tungsten bronzes (P02)4(W03)2m (m=2,4, 6,7) as a function of layer thickness, with special attention on the m=7 density wave superconductor. These materials have several layers of corner-sharing WO6 octahedra separated by one PO4 layer, leading to a tunable octahedral layer thickness with m. In the optical regime, the spectra of the m=2, 4, 6, and 7 materials display an anisotropic electronic excitation, originating from the W intra t2g d to d transition. The intensities and frequencies of these excitations vary with the octahedral layer thickness, consistent with a softer lattice with increasing m. The low-frequency electrodynamics of the monophosphate tungsten bonzes show a gap or pseudogap feature in the infrared, demonstrating a ubiquitous bound camer response. The m=7 density wave superconductor is especially interesting. The variable temperature ab-plane spectra display a suppression of the optical conductivity along the b-axis below 140 K, giving rise to charge localization and anisotropic charge density wave gap formation near 1400 cm-1. This middle infrared charge localization is directly related to the appearance of both flat and dispersive bands along b. Although oscillator strength is redistributed among the free carrier response, charge density wave gap absorption, and d to d transition in the density wave states, the spectral weight is largely conserved below the plasma frequency. Based upon these observations, P4W 14050 is another example of a superconductor with an unusual normal state.

scholarly journals STRIPED QUANTUM HALL PHASES

2001 ◽  
Vol 15 (10n11) ◽  
pp. 1359-1368
Author(s):  
FELIX VON OPPEN ◽  
BERTRAND I. HALPERIN ◽  
ADY STERN
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Quantum Hall ◽  
Ground States ◽  
Landau Levels ◽  
Resistivity Tensor ◽  
Quantum Hall System

Recent experiments seem to confirm predictions that interactions lead to charge-density wave ground states in higher Landau levels. These new "correlated" ground states of the quantum Hall system mainfest themselves for example in a strongly anisotropic resistivity tensor. We give a brief introduction and overview of this new and emerging field.

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