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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Melting a Hubbard dimer: benchmarks of `ALDA' for quantum thermodynamics

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Autor(es):
Herrera, Marcela [1] ; Zawadzki, Krissia [2] ; D'Amico, Irene [3]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Ave Estados 5001, BR-09210580 Sao Paulo - Brazil
[2] Univ Sao Paulo, Inst Fis Sao Carlos, Dept Fis & Ciencia Interdisciplinar, Caixa Postal 369, BR-13560970 Sao Carlos, SP - Brazil
[3] Univ York, Dept Phys, York YO10 5DD, N Yorkshire - England
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: European Physical Journal B; v. 91, n. 10 OCT 10 2018.
Citações Web of Science: 3
Resumo

The competition between evolution time, interaction strength, and temperature challenges our understanding of many-body quantum systems out-of-equilibrium. Here, we consider a benchmark system, the Hubbard dimer, which allows us to explore all the relevant regimes and calculate exactly the related average quantum work. At difference with previous studies, we focus on the effect of increasing temperature, and show how this can turn the competition between many-body interactions and driving field into synergy. We then turn to use recently proposed protocols inspired by density functional theory to explore if these effects could be reproduced by using simple approximations. We find that, up to and including intermediate temperatures, a method which borrows from ground-state adiabatic local density approximation improves dramatically the estimate for the average quantum work, including, in the adiabatic regime, when correlations are strong. However at high temperature and at least when based on the pseudo-LDA, this method fails to capture the counterintuitive qualitative dependence of the quantum work with interaction strength, albeit getting the quantitative estimates relatively close to the exact results. (AU)

Processo FAPESP: 14/02778-1 - Evoluções super-adiabáticas e aspectos quânticos em termodinâmica fora do equilíbrio
Beneficiário:Alba Marcela Herrera Trujillo
Linha de fomento: Bolsas no Brasil - Doutorado