Quantum Monte Carlo studies of emerging quantum phases and quantum phase transitions in frustrated quantum magnets

受挫量子磁体中新兴量子相和量子相变的量子蒙特卡罗研究

• 批准号: 55436831
• 负责人: Professor Stefan Wessel, Ph.D.
• 金额: --
• 依托单位: Institut für Theoretische Festkörperphysik C
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/55436831?language=en
• 关键词: Quantum; Monte; Carlo; studies; emerging

The goal of this proposal is to study frustrated quantum spin systems using unbiased largescale quantum Monte-Carlo simulations. The models under consideration arise from introducing quantum fluctuations to frustrated classical spin models, and do not suffer from a quantum Monte Carlo sign problem in the numerical calculations. The effects of geometric frustration, strong quantum fluctuations and disorder in such systems will be studied, in particular the nature of emerging quantum phases and quantum phase transitions. The quantum Monte Carlo methods we developed can be used for the calculation of both ground state as well as finite temperature properties. The systems sizes achieved allow for a reliable analysis to the thermodynamic limit.

本论文的目标是利用无偏的大尺度量子蒙特-卡罗模拟研究受抑的量子自旋系统。所考虑的模型产生于引入量子涨落到受挫折的经典自旋模型，并且在数值计算中不遭受量子Monte Carlo符号问题。几何挫折的影响，强量子涨落和无序在这样的系统将被研究，特别是新兴的量子相位和量子相变的性质。我们发展的量子Monte Carlo方法既可用于计算基态性质，也可用于计算有限温度性质。所实现的系统尺寸允许对热力学极限进行可靠的分析。

项目成果

Thermal phase transitions in a honeycomb lattice gas with three-body interactions.

具有三体相互作用的蜂窝晶格气体中的热相变

• DOI: 10.1103/physreve.88.052135
• 发表时间: 2013
• 期刊: Physical review. E, Statistical, nonlinear, and soft matter physics
• 作者: M. Lohöfer;L. Bonnes;S. Wessel
• 通讯作者: S. Wessel

Quantum phase transitions in the Kane-Mele-Hubbard model

• DOI: 10.1103/physrevb.85.115132
• 发表时间: 2012-03-29
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Hohenadler, M.;Meng, Z. Y.;Assaad, F. F.
• 通讯作者: Assaad, F. F.

Quantum Monte Carlo studies of edge magnetism in chiral graphene nanoribbons

• DOI: 10.1103/physrevb.87.155441
• 发表时间: 2013-03
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Michael Golor;T. C. Lang;S. Wessel