arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1903.03076cond-mat.str-elcond-mat.dis-nn
收藏

一维玻色-哈伯德模型的基态phase diagram

Ground state phase diagram of the one-dimensional Bose-Hubbard model from restricted Boltzmann machines

Kristopher McBrian, Giuseppe Carleo, Ehsan Khatami

摘要:

受量子多体系统的基态波函数表示中使用限制玻尔兹曼机作为变分模型的最新进展的启发,我们利用一个开源的平台来构建这样的模型称为NetKet探索限制玻尔兹曼机的玻色晶格模型的适用范围。在NetKet中,我们设计并训练这些机器,通过对Fock空间的Monte Carlo采样,用于一维Bose-哈伯德模型。我们改变参数,如现场排斥的强度,化学势,系统的大小和最大的网站占有率,并使用收敛的状态方程,以确定莫特绝缘和超流相之间的相边界。我们将平均密度和能量与精确对角化的结果进行了比较,并绘制了基态相图,这与以前通过常规方法获得的结果定性一致。

英文摘要:

Motivated by recent advances in the representation of ground state wavefunctions of quantum many-body systems using restricted Boltzmann machines as variational ansatz, we utilize an open-source platform for constructing such ansatz called NetKet to explore the extent of applicability of restricted Boltzmann machines to bosonic lattice models. Within NetKet, we design and train these machines for the one-dimensional Bose-Hubbard model through a Monte Carlo sampling of the Fock space. We vary parameters such as the strength of the onsite repulsion, the chemical potential, the system size and the maximum site occupancy and use converged equations of state to identify phase boundaries between the Mott insulating and superfluid phases. We compare the average density and the energy to results from exact diagonalization and map out the ground state phase diagram, which agrees qualitatively with previous finding obtained through conventional means.

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。

↑