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Effects of inhomogeneities and thermal fluctuations on the spectral function of a model d-wave superconductor
| Content Provider | Semantic Scholar |
|---|---|
| Author | Valdez-Balderas, Daniel |
| Copyright Year | 2008 |
| Abstract | We compute the spectral function A k , of a model two-dimensional high-temperature superconductor at both zero and finite temperatures T. The model consists of a two-dimensional BCS Hamiltonian with d-wave symmetry, which has a spatially varying, thermally fluctuating, complex gap . Thermal fluctuations are governed by a Ginzburg-Landau free energy functional. We assume that an areal fraction c of the superconductor has a large regions , while the rest has a smaller regions , both of which are randomly distributed in space. We find that A k , is most strongly affected by inhomogeneity near the point k = ,0 and the symmetry-related points . For c 0.5, A k , exhibits two double peaks at positive and negative energies near this k point if the difference between and is sufficiently large in comparison to the hopping integral; otherwise, it has only two broadened single peaks. The strength of the inhomogeneity required to produce a split spectral function peak suggests that inhomogeneity is unlikely to be the cause of a second branch in the dispersion relation, such as has been reported in underdoped LSCO. Thermal fluctuations also affect A k , most strongly near k= ,0 . Typically, peaks that are sharp at T=0 become reduced in height, broadened, and shifted toward lower energies with increasing T; the spectral weight near k= ,0 becomes substantial at zero energy for T greater than the phase-ordering temperature. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.physics.ohio-state.edu/~stroud/valdez08.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Arabic numeral 0 Energy, Physics Exhibits as Topic Frequency-hopping spread spectrum Hamiltonian (quantum mechanics) Randomness Small Spectral density Thermal grease free energy |
| Content Type | Text |
| Resource Type | Article |
