Microscopic view of a two-dimensional lattice-Gas ising system within the grand canonical ensemble
Microscopic view of a two-dimensional lattice-Gas ising system within the grand canonical ensemble
复制标题
大正则系综中二维晶格-气体系统的微观视图
DOI：
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发表时间：
2000
影响因子：
8.6
通讯作者：
P. Thibado
中科院分区：
文献类型：
--
作者：
V. LaBella;D. Bullock;M. Anser;Z. Ding;C. Emery;L. Bellaiche;P. Thibado
在GaAs(001)表面观察到了可逆的2D临界相变，并将其模拟为晶格-气体伊辛系统。在不沉积任何物质的情况下，2D GaAs岛自发形成。通过扫描隧道显微镜图像测量了有序参数、四个临界指数和耦合能随温度和压力变化的微区结构和关联函数。通过临界点对二维Ising系统的磁区结构进行了前所未有的深入研究，并给出了用于模拟GaAs(001)表面的完整的哈密顿量。
A reversible 2D critical transition is observed on the GaAs(001) surface and modeled as a lattice-gas Ising system. Without depositing any material, 2D GaAs islands spontaneously form. The order parameter, four critical exponents, and coupling energies are measured from scanning tunneling microscope images of the microscopic domain structure and correlation functions as a function of temperature and pressure. Unprecedented insight into the domain structure of a 2D Ising system through the critical point and a complete Hamiltonian for modeling the GaAs(001) surface are presented.