含软核玻色子的亏损诱导超实性
Defect-induced supersolidity with soft-core bosons
摘要：
40多年前，Andreev、Lifshitz和Chester提出可能存在一种特殊的物质固相，由于自组装晶体的基态中形成零点缺陷，其微观成分可以无阻力地超流体流动。然而，在实验和理论上，仍然需要找到一个明确建立这种机制的物理系统。本文研究了具有有限程软核相互作用的二维玻色子的零温相图。对于低的颗粒密度，该系统被示出为具有固相，其中零点空位自发地出现，并通过晶体的颗粒的超流流动给米。这提供了第一个与Andreev-Lifshitz-Chester方案一致的缺陷诱导的连续空间超固体的例子。
英文摘要：
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. This provides the first example of defects-induced, continuous-space supersolidity consistent with the Andreev-Lifshitz-Chester scenario.
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