1997
DOI: 10.1103/physrevlett.78.2803
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Quasiparticle Lifetime in a Finite System: A Nonperturbative Approach

Abstract: The problem of electron-electron lifetime in a quantum dot is studied beyond perturbation theory by mapping onto the problem of localization in the Fock space. Localized and delocalized regimes are identified, corresponding to quasiparticle spectral peaks of zero and finite width, respectively. In the localized regime, quasiparticle states are single-particle-like. In the delocalized regime, each eigenstate is a superposition of states with very different quasiparticle content. The transition energy is e c Ӎ D… Show more

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Cited by 617 publications
(923 citation statements)
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“…We can compare this estimate with the condition for the onset of chaos presented in [1][2][3][4]. At this energy the spacing between the many-body states is D ≈ 0.04 eV.…”
Section: Chaotic Eigenstatesmentioning
confidence: 94%
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“…We can compare this estimate with the condition for the onset of chaos presented in [1][2][3][4]. At this energy the spacing between the many-body states is D ≈ 0.04 eV.…”
Section: Chaotic Eigenstatesmentioning
confidence: 94%
“…Under these conditions even a small residual interaction introduces strong nonperturbative mixing of the basis states. Roughly speaking, this happens when the configuration-mixing off-diagonal matrix elements H ij of the Hamiltonian become greater than the energy spacing between the basis states coupled by the residual interaction (see, e.g., [1][2][3][4]). …”
Section: Introductionmentioning
confidence: 99%
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“…The standard expectation from mesoscopic physics [73,74] is that, for a system of length L, eigenstates separated by less than the Thouless energy D/L 2 are effectively random. This is also the content of the off-diagonal part of the eigenstate thermalization hypothesis.…”
Section: Broad Distributions In the Griffiths Phasementioning
confidence: 99%