arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1001.3559cond-mat.str-el
收藏

三角晶格上无自旋扩展Falicov-Kimball模型的基态phase diagram

Ground state phase diagram of a spinless, extended Falicov-Kimball model on the triangular lattice

Umesh K. Yadav, T. Maitra, Ishwar Singh, A. Taraphder

摘要:

具有六方层状结构的相关系统已经脱颖而出,在钴酸盐,过渡金属dichalcogenides和钆的新的兴趣。虽然超导性,不寻常的金属和可能的奇异状态(通过强烈的局部波动阻止长程序)似乎来自挫折和相关性在这样的系统中协同工作,但它们在较低的温度下冻结为结晶状态。在这些系统中的一些潜在的有效哈密顿被认为是Falicov-Kimball模型,因此,深入研究这个模型的基态和它的扩展版本的非二分晶格是重要的。使用Monte Carlo搜索算法,我们确定了大量的不同的可能的基态的电荷顺序以及价和金属-绝缘体过渡。这种竞争态,在能量上接近,引起复杂的电荷顺序和其他破缺的对称性结构,以及在这些系统的基态中观察到的相分离。

英文摘要:

Correlated systems with hexagonal layered structures have come to fore with renewed interest in Cobaltates, transition-metal dichalcogenides and GdI2. While superconductivity, unusual metal and possible exotic states (prevented from long range order by strong local fluctuations) appear to come from frustration and correlation working in tandem in such systems, they freeze at lower temperature to crystalline states. The underlying effective Hamiltonian in some of these systems is believed to be the Falicov-Kimball model and therefore, a thorough study of the ground state of this model and its extended version on a non-bipartite lattice is important. Using a Monte Carlo search algorithm, we identify a large number of different possible ground states with charge order as well as valence and metal-insulator transitions. Such competing states, close in energy, give rise to the complex charge order and other broken symmetry structures as well as phase segregations observed in the ground state of these systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑