2013

Defect-induced supersolidity with soft-core bosons

Cinti, Fabio, Macrì, Tommaso, Lechner, Wolfgang et al.

Understand

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 show to feature a solid phase in which zero-point vacancies emerge spontaneously and give rice to superfluid flow of particles through the crystal.

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