One-dimensional bosons interacting via a soft-shoulder potential are investigated at zero temperature. The flatness of the potential at short distances introduces a typical length, such that, at relatively high densities and sufficiently strong interactions, clusters are formed, even in the presence of a completely repulsive potential. We evaluate the static density response function of this system across the transition from the liquid to the cluster liquid phases. Such quantity reveals the density modulations induced by a weak periodic external potential, and is maximal at the clustering wavevector. It is known that this response function is proportional to the static structure factor in the classical regime at high temperature, while for this zero-temperature quantum system, we extract it from the dynamical structure factor evaluated with quantum Monte Carlo methods.

Static density response of one-dimensional soft bosons across the clustering transition / M. Teruzzi, D. Pini, S. Rossotti, D. Galli, G. Bertaina. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6596. - 1041:1(2018 Jun 12), pp. 012009.1-012009.7. ((Intervento presentato al 19. convegno RPMBT : International Conference on Recent Progress in Many-Body Theories : 25 June 2017 through 30 June 2017 tenutosi a Pohang (South Korea) nel 2017.

Static density response of one-dimensional soft bosons across the clustering transition

D. Pini
Secondo
;
D. Galli
Penultimo
;
G. Bertaina
Ultimo
2018

Abstract

One-dimensional bosons interacting via a soft-shoulder potential are investigated at zero temperature. The flatness of the potential at short distances introduces a typical length, such that, at relatively high densities and sufficiently strong interactions, clusters are formed, even in the presence of a completely repulsive potential. We evaluate the static density response function of this system across the transition from the liquid to the cluster liquid phases. Such quantity reveals the density modulations induced by a weak periodic external potential, and is maximal at the clustering wavevector. It is known that this response function is proportional to the static structure factor in the classical regime at high temperature, while for this zero-temperature quantum system, we extract it from the dynamical structure factor evaluated with quantum Monte Carlo methods.
one dimensional bosons; soft-shoulder potential; clustering; response function
Settore FIS/03 - Fisica della Materia
Asia Pacific Center for Theoretical Physics (APCTP)
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/580299
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