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Enhanced interaction effects in the vicinity of the topological transition
Disordered Systems and Neural Networks · Submitted 2 Jul 2019
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We perform a calculation illustrating that electrons of the second group are responsible for inelastic lifetime making it anomalously short, so that the concept of quasiparticles applies to these electrons only marginally.
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The abstract, sentence by sentence
A metal near the topological transition can be loosely viewed as consisting of two groups of electrons. First group are "bulk" electrons occupying most of the Brillouin zone. Second group are electrons with wave vectors close to the topological transition point. Kinetic energy, $\tilde{E}_F$, of electrons of the first group is much bigger than kinetic energy, $E_F$, of electrons of the second group. With electrons of the second group being slow, the interaction effects are more pronounced for these electrons. We perform a calculation illustrating that electrons of the second group are responsible for inelastic lifetime making it anomalously short, so that the concept of quasiparticles applies to these electrons only marginally. We also demonstrate that interactions renormalize the spectrum of electrons in the vicinity of topological transition, the parameters of renormalized spectrum being strongly dependent on the proximity to the transition. Another many-body effect that evolves dramatically as the Fermi level is swept through the transition is the Friedel oscillations of the electron density created by electrons of the second group around an impurity. These oscillations are strongly anisotropic with a period depending on the direction. Scattering of electrons off these oscillations give rise to a temperature-dependent ballistic correction to the conductivity.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | A metal near the topological transition can be loosely viewed as consisting of two groups of electrons. | background 0.91 | 0.15 | 0.04 | hedged possibility 0.87 |
| s1 | First group are "bulk" electrons occupying most of the Brillouin zone. | background 0.92 | 0.13 | 0.02 | asserted 1.00 |
| s2 | Second group are electrons with wave vectors close to the topological transition point. | background 0.97 | 0.11 | 0.03 | asserted 0.99 |
| s3 | Kinetic energy, $\tilde{E}_F$, of electrons of the first group is much bigger than kinetic energy, $E_F$, of electrons of the second group. | background 0.91 | 0.22 | 0.04 | asserted 1.00 |
| s4 | With electrons of the second group being slow, the interaction effects are more pronounced for these electrons. | background 0.49 | 0.17 | 0.10 | asserted 0.99 |
| s5 | We perform a calculation illustrating that electrons of the second group are responsible for inelastic lifetime making it anomalously short, so that the concept of quasiparticles applies to these electrons only marginally. | result 0.85 | 0.95 | 0.43 | asserted 1.00 |
| s6 | We also demonstrate that interactions renormalize the spectrum of electrons in the vicinity of topological transition, the parameters of renormalized spectrum being strongly dependent on the proximity to the transition. | result 0.92 | 0.95 | 0.22 | asserted 1.00 |
| s7 | Another many-body effect that evolves dramatically as the Fermi level is swept through the transition is the Friedel oscillations of the electron density created by electrons of the second group around an impurity. | result 0.94 | 0.70 | 0.12 | asserted 1.00 |
| s8 | These oscillations are strongly anisotropic with a period depending on the direction. | result 1.00 | 0.72 | 0.05 | asserted 1.00 |
| s9 | Scattering of electrons off these oscillations give rise to a temperature-dependent ballistic correction to the conductivity. | result 0.97 | 0.67 | 0.11 | asserted 1.00 |
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Original abstract
A metal near the topological transition can be loosely viewed as consisting of two groups of electrons. First group are "bulk" electrons occupying most of the Brillouin zone. Second group are electrons with wave vectors close to the topological transition point. Kinetic energy, $\tilde{E}_F$, of electrons of the first group is much bigger than kinetic energy, $E_F$, of electrons of the second group. With electrons of the second group being slow, the interaction effects are more pronounced for these electrons. We perform a calculation illustrating that electrons of the second group are responsible for inelastic lifetime making it anomalously short, so that the concept of quasiparticles applies to these electrons only marginally. We also demonstrate that interactions renormalize the spectrum of electrons in the vicinity of topological transition, the parameters of renormalized spectrum being strongly dependent on the proximity to the transition. Another many-body effect that evolves dramatically as the Fermi level is swept through the transition is the Friedel oscillations of the electron density created by electrons of the second group around an impurity. These oscillations are strongly anisotropic with a period depending on the direction. Scattering of electrons off these oscillations give rise to a temperature-dependent ballistic correction to the conductivity.
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