Topological Excitations of One-Dimensional Correlated Electron Systems
- NHMFL and Department of Physics, Florida State University, Tallahassee, Florida 32310 (United States)
- Department of Physics, Stanford University, Stanford, California 94305 (United States)
Elementary, low-energy excitations are examined by bosonization in one-dimensional systems with quasi-long-range order. A new, independently measurable attribute is introduced to describe such excitations. It is defined as a number w which determines how many times the phase of the order parameter winds as an excitation is transposed from far left to far right. The winding number is zero for electrons and holes with conventional quantum numbers, but it acquires a nontrivial value w=1 for neutral spin- (1) /(2) excitations and for spinless excitations with a unit electron charge. It may even be irrational, if the charge is irrational. Thus, these excitations are topological. {copyright} {ital 1999} {ital The American Physical Society }
- OSTI ID:
- 321549
- Journal Information:
- Physical Review Letters, Vol. 82, Issue 8; Other Information: PBD: Feb 1999
- Country of Publication:
- United States
- Language:
- English
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