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Finite-temperature effects on interacting bosonic one-dimensional systems in disordered lattices

  Articoli su Riviste JCR/ISI  (anno 2016)

Autori:  Gori L., Barthel T., Kumar A., Lucioni E., Tanzi L., Inguscio M., Modugno G., Giamarchi T., D'Errico C., Roux G

Affiliazione Autori:  1) LENS and Dipartimento di Fisica e Astronomia, Universitá di Firenze, 50019 Sesto Fiorentino, Italy 2) Department of Physics, Duke University, Durham, North Carolina 27708, USA 3) LPTMS, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay, France 4) Istituto Nazionale di Ottica, CNR, 50019 Sesto Fiorentino, Italy 5) Department of Quantum Matter Physics, University of Geneva, 1211 Geneva, Switzerland

Riassunto:  We analyze the finite-temperature effects on the phase diagram describing the insulating properties of interacting one-dimensional bosons in a quasiperiodic lattice. We examine thermal effects by comparing experimental results to exact diagonalization for small-sized systems and to density-matrix renormalization group (DMRG) computations. At weak interactions, we find short thermal correlation lengths, indicating a substantial impact of temperature on the system coherence. Conversely, at strong interactions, the obtained thermal correlation lengths are significantly larger than the localization length, and the quantum nature of the T = 0 Bose-glass phase is preserved up to a crossover temperature that depends on the disorder strength. Furthermore, in the absence of disorder, we show how quasiexact finite-T DMRG computations, compared to experimental results, can be employed to estimate the temperature, which is not directly accessible in the experiment.

Rivista/Giornale:  PHYSICAL REVIEW A
Volume n.:  93      Pagine da: 033650-1  a: 033650-14
Ulteriori informazioni:  This work was supported by the ERC (Grant No. 247371-DISQUA), by the EU-H2020 research and innovation programme (Grant No. 641122-QUIC) and by the Italian MIUR (Grant No. RBFR12NLNA-ArtiQuS). G.R. acknowledges support from the French ANR Program No. ANR-2011-BS04-012-01 QuDec. T.G. acknowledges support from the Swiss SNF under Division II.
DOI: 10.1103/PhysRevA.93.033650

*Impact Factor della Rivista: (2016) 2.925   *Citazioni: 3
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

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