Defect-induced supersolidity with soft-core bosons

F. Cinti (), T. Macrì, W. Lechner, G. Pupillo and T. Pohl
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F. Cinti: Max Planck Institute for the Physics of Complex Systems
T. Macrì: Max Planck Institute for the Physics of Complex Systems
W. Lechner: IQOQI, Austrian Academy of Science, and Institute for Theoretical Physics, University of Innsbruck
G. Pupillo: IPCMS (UMR 7504) and ISIS (UMR 7006), Université de Strasbourg and CNRS
T. Pohl: Max Planck Institute for the Physics of Complex Systems

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract More than 40 years ago, Andreev, Lifshitz and Chester suggested the possible existence of a peculiar solid phase of matter, the microscopic constituents of which can flow superfluidly without resistance due to the formation of zero-point defects in the ground state of self-assembled crystals. Yet, a physical system where this mechanism is unambiguously established remains to be found, both experimentally and theoretically. Here we investigate the zero-temperature phase diagram of two-dimensional bosons with finite-range soft-core interactions. For low particle densities, the system is shown to feature a solid phase in which zero-point vacancies emerge spontaneously and give rise to superfluid flow of particles through the crystal. This provides the first example of defect-induced, continuous-space supersolidity consistent with the Andreev–Lifshitz–Chester scenario.

Date: 2014
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DOI: 10.1038/ncomms4235

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