Microscopic solitons in correlated electronic systems: theory versus experiment
- CNRS UMR 8626 LPTMS, Univ. Paris-Sud, Orsay (France)
Symmetry broken electronic states give rise to topological defects: from extended domain walls - 'stripes' as solitonic lattices to microscopic solitons as anomalous quasi-particles and instantons in their dynamics. We shall collect and interpret experimental evidences on existence of microscopic solitons, and their determining role in electronic processes of quasi-1D electronic crystals. Thus, the ferroelectric charge ordering in organic conductors gives access to several types of solitons observed in conductivity (holons) and in permittivity (polar kinks), to solitons' bound pairs in optics, to compound charge-spin solitons. In charge density waves, the individual phase solitons have been visually captured in recent STM experiments. The resolved subgap tunneling spectra recover these solitons (in aggregated form of dislocations in statics and as instantons - the phase slips in dynamics), as well as the amplitude kinks - the spinons.The theory relies upon the regime of quantum dissipation provided by soft mode emittance in the course of the soliton creation, and on effects of dimensional crossover. With onset of a 2D or a 3D long range order, the topologically nontrivial solitons experience the confinement resulting in the spin-charge recombination. It originates the symmetry broken spin-or charge- roton configurations with charge- or spin- kinks localized in the core, correspondingly for cases of repulsion and attraction. These complex excitations can be viewed as nucleuses of the melted stripe phases, which appears in doped antiferromagnetic-Mott insulators or in spin-polarized superconductors and charge density waves.
- OSTI ID:
- 21304872
- Journal Information:
- AIP Conference Proceedings, Vol. 1134, Issue 1; Conference: Landau memorial conference on advances in theoretical physics, Chernogolovka (Russian Federation), 22-26 Jun 2008; Other Information: DOI: 10.1063/1.3149502; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
CHARGE DENSITY
CRYSTALS
DISLOCATIONS
DOPED MATERIALS
ELECTRIC CONDUCTORS
EXCITATION
FERROELECTRIC MATERIALS
GINZBURG-LANDAU THEORY
INSTANTONS
PERMITTIVITY
SOLITONS
SPIN
SPIN ORIENTATION
SUPERCONDUCTORS
SYMMETRY BREAKING
TUNNEL EFFECT