Local states in one-dimensional CDW (charge density wave) materials: Spectral signatures for polarons and bipolarons in MX chains

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6800639

Swanson, B. I.; Donohoe, R. J.; Worl, L. A.; Bulou, A. D.F.; Arrington, C. A.; Gammel, J. T.; Saxena, A.; Bishop, A. R.

We have undertaken a combined theoretical and experimental effort directed toward the examination of both the ground and defect states in halide-bridged mixed-valence metal linear chains materials as they are tuned within and between broken symmetry phases. Novel low-dimensional highly correlated electronic materials offer a difficult theoretical challenge as we must span from a description of electronic structure on a molecular scale to the meso scale structure that is intrinsic to these solids. Our theoretical effort at Los Alamos combines quantum chemistry, band structure calculations, and many body modeling using Peierls-Hubbard Hamiltonians in order to model ground and local states. The experimental effort combines synthesis and a variety of microscopic structural and spectroscopic probes and macroscopic measurements in an effort to fully characterize both ground and local states as these materials are tuned in the phase boundary regions between broken symmetry states. The present article summarizes some of our recent research using optical spectroscopy to obtain signatures of photoexcited and intrinsic local states and compares these experimental results with Peierls-Hubbard calculations of the optical properties of these materials. Details concerning the theoretical and experimental approaches can be found elsewhere.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6800639
• Report Number(s): LA-UR-90-2166; CONF-9006218-1; ON: DE90013150
• Resource Relation: Conference: Symposium on photoinduced charge transfer in molecular crystals and liquid crystals, Rochester, NY (USA), 6-9 Jun 1990
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
HALIDE MINERALS
POLARONS
METALS
CHARGE DENSITY
ELECTRON TRANSFER
ELECTRON-ELECTRON COUPLING
ELECTRON-PHONON COUPLING
LIQUID CRYSTALS
OPTICAL PROPERTIES
PLATINUM BROMIDES
PLATINUM CHLORIDES
PLATINUM IODIDES
RAMAN EFFECT
SOLIDS
BROMIDES
BROMINE COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
CRYSTALS
ELEMENTS
FLUIDS
HALIDES
HALOGEN COMPOUNDS
IODIDES
IODINE COMPOUNDS
LIQUIDS
MINERALS
PHYSICAL PROPERTIES
PLATINUM COMPOUNDS
QUASI PARTICLES
TRANSITION ELEMENT COMPOUNDS
656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)
360104 - Metals & Alloys- Physical Properties