Direct observation of soliton dynamics in charge-density waves on a quasi-one-dimensional metallic surface

2004 ◽  
Vol 70 (8) ◽  
Author(s):  
Harumo Morikawa ◽  
Iwao Matsuda ◽  
Shuji Hasegawa
Keyword(s):  
Charge Density ◽  
Direct Observation ◽  
Charge Density Waves ◽  
Metallic Surface ◽  
Density Waves ◽  
One Dimensional ◽  
Soliton Dynamics

Theory of pseudogaps in charge density waves in application to photo electron spectroscopy

2002 ◽  
Vol 12 (9) ◽  
pp. 73-73
Author(s):  
S. I. Matveenko ◽  
S. Brazovskii
Keyword(s):  
Charge Density ◽  
Adiabatic Approximation ◽  
Free Particle ◽  
Charge Density Waves ◽  
Photon Absorption ◽  
Electronic Excitations ◽  
Dimensional Electron ◽  
Density Waves ◽  
One Dimensional ◽  
Exponential Decrease

For a one-dimensional electron-phonon system we consider the photon absorption involving electronic excitations within the pseudogap energy range. Within the adiabatic approximation for the electron - phonon interactions these processes are described by ronlinear configurations of an instanton type. We calculate the subgap absorption as it can be observed by means of photo electron or tunneling spectroscopies. In details we consider systems with gapless modes: 1D semiconductors with acoustic phonons and incommensurate charge density waves. We found that below the free particle edge the pseudogap starts with the exponential decrease of transition rates changing to a power law deeply within the pseudogap, near the absolute edge.

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