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

Gori, Lorenzo
Barthel, Thomas
Kumar, Avinash
Lucioni, Eleonora
Tanzi, Luca
Inguscio, Massimo
Modugno, Giovanni
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Published in Physical Review. A. 2016, vol. 93, no. 3, p. 033650
Abstract 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.
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Research group Groupe Giamarchi
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GORI, Lorenzo et al. Finite-temperature effects on interacting bosonic one-dimensional systems in disordered lattices. In: Physical Review. A, 2016, vol. 93, n° 3, p. 033650. https://archive-ouverte.unige.ch/unige:87800

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Deposited on : 2016-09-27

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