Superfluidity of one-dimensional trapped fermionic optical lattices with spatially alternating interactions

24th IUPAP Conference on Computational Physics

物理学;计算机科学

Yamamoto, Atsushi^1 ; Yunoki, Seiji^1,2,3,4

Computational Materials Science Research Team, RIKEN AICS, Kobe, Hyogo 650-0047, Japan^1

Computational Condensed Matter Physics Laboratory, RIKEN ASI, Saitama 351-0198, Japan^2

CREST, Japan Science and Technology, Kawaguchi, Saitama 332-0012, Japan^3

Computational Quantum Matter Research Team, RIKEN CEMS, Saitama 351-0198, Japan^4

关键词: Density matrix renormalization group methods;    Ground state phase diagram;    Harmonic trapping potential;    Physical quantities;    Repulsive interactions;    Site interaction;    Spatially modulated;    Two-body interactions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/454/1/012067/pdf
DOI  :  10.1088/1742-6596/454/1/012067

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Recent experiments have made it possible to spatially control local two-body interactions between ultracold atoms in inhomogeneous optical lattices. Motivated by this experimental progress, here we study theoretically one-dimensional trapped fermionic optical lattices with spatially modulated on-site interactions. The density matrix renormalization group method is used to examine the ground state phase diagram of a harmonically trapped Hubbard model with spatially alternating on-site repulsive interactions, U1and U2. With varying the strength of the harmonic trapping potential, we find a pair correlated metallic state in the ground state phase diagram, which can be stable only when U1≠ U2. We discuss the properties of this possibly new state by examining various static physical quantities.