SUPERCONDUCTIVITY AND THE QUANTUM HARD-CORE DIMER GAS
SUPERCONDUCTIVITY AND THE QUANTUM HARD-CORE DIMER GAS
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DOI：
10.1103/physrevlett.61.2376
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发表时间：
1988-11-14
影响因子：
8.6
通讯作者：
KIVELSON, SA
中科院分区：
文献类型：
--
作者：
ROKHSAR, DS;KIVELSON, SA
我们讨论了由二维方晶格上任意密度的量子硬核二聚体气体实现的短程共振价键系统。当二聚体完全覆盖晶格时，我们认为存在从二聚体晶体到绝缘量子液态的一级跃迁，该状态具有低能、中性、无自旋激发，我们称之为“共振”。对于小于密堆积密度的情况，基态是超流体。除了常见的戈德斯通模式外，还有低能、无自旋区域边界激发。
We discuss the short-range resonating-valence-bond system as realized by a quantum hard-core dimer gas of arbitrary density on a two-dimensional square lattice. When the dimers completely cover the lattice, we argue that there is a first-order transition from a dimer crystal to an insulating quantum liquid state which possesses low-energy, neutral, spinless excitations which we call" resonons." For less than close-packed densities, the ground state is a superfluid. In addition to the usual Goldstone mode, there are low-energy, spinless zone-boundary excitations.