The Quantum-Classical Metal

In a normal Fermi liquid, Landau's theory precludes the loss of single-fermion quantum coherence in the low-energy, low-temperature limit. For highly anisotropic, strongly correlated metals, there is no proof that this remains the case, and quantum coherence for transport in some directions may...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1998-03, Vol.279 (5359), p.2071-2076
Main Authors: Clarke, David G., Strong, S. P., Chaikin, P. M., Chashechkina, E. I.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity of specific materials
Conductivity phenomena in semiconductors and insulators
Degrees of freedom
Electrical phases
Electrical resistivity
Electronic transport in condensed matter
Energy
Evidence
Exact sciences and technology
Fermi liquid
Fermi liquids
Fermions
Galvanomagnetic and other magnetotransport effects
Ground state
Liquids
Magnetic fields
Numbers
Oscillators
Physics
Polymers
organic compounds (including organic semiconductors)
Quantum theory
Quasiparticles
Review
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Summary:In a normal Fermi liquid, Landau's theory precludes the loss of single-fermion quantum coherence in the low-energy, low-temperature limit. For highly anisotropic, strongly correlated metals, there is no proof that this remains the case, and quantum coherence for transport in some directions may be lost intrinsically. This loss of coherence should stabilize an unusual, qualitatively anisotropic non-Fermi liquid, separated by a zero-temperature quantum phase transition from the Fermi liquid state and categorized by the unobservability of certain interference effects. There is compelling experimental evidence for this transition as a function of magnetic field in the metallic phase of the organic conductor (TMTSF)$_2$PF$_6$ (where TMTSF is tetramethyltetraselenafulvalene).
ISSN:0036-8075
1095-9203
DOI:10.1126/science.279.5359.2071