Trapped Ultracold Fermions in Double-Well Optical Lattices
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概要
- 論文の詳細を見る
We study the ground state properties of ultracold fermions trapped in a one-dimensional double-well optical lattice by using the density-matrix renormalization group method. The system is described by an extended Hubbard model with alternating hopping integrals and an external harmonic confining potential. We clarify the characteristic features of the metal–insulator phase transition originating from the double-well structure of the lattices. Several different types of insulating regions coexist when the number of atoms at each site is an integer or a half integer. We found that each insulating phase except for a band insulator exhibits rather large local density fluctuations, reflecting the strong dimerization of atoms within the unit cells of double-well lattices. The phase characteristics are elucidated in detail by investigating the profiles of the local density of atoms, the local density (spin) fluctuations, the double-occupancy probability and the spatially extended sp in correlations.
- Physical Society of Japanの論文
- 2009-12-15
著者
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Kawakami Norio
Department Of Applied Physics Osaka University
-
Yamashita Makoto
NTT Basic Research Laboratories
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Yamamoto Atsushi
Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University
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Kawakami Norio
Department of Physics, Kyoto University, Kyoto 606-8502
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