Proximity effects in cold atom artificial graphene
文献类型：期刊论文
| 作者 | Grass, T; Chhajlany, RW; Tarruell, L; Pellegrini, V; Lewenstein, M; Grass, T (reprint author), Univ Maryland, Joint Quantum Inst, College Pk, MD 20742 USA.; Grass, T (reprint author), Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, E-08860 Castelldefels, Barcelona, Spain. |
| 刊名 | 2D MATERIALS
 |
| 出版日期 | 2017 |
| 卷号 | 4期号:1页码:15039 |
| 关键词 | Cold Atoms In Optical Lattices Artificial Graphene Superfluidity Proximity Effect |
| DOI | http://dx.doi.org/10.1088/2053-1583/aa50c6 |
| 英文摘要 | Cold atoms in an optical lattice with brick-wall geometry have been used to mimic graphene, a two-dimensional material with characteristic Dirac excitations. Here we propose to bring such artificial graphene into the proximity of a second atomic layer with a square lattice geometry. For non-interacting fermions, we find that such bilayer system undergoes a phase transition from a graphene-like semi-metal phase, characterized by a band structure with Dirac points, to a gapped band insulator phase. In the presence of attractive interactions between fermions with pseudospin-1/2 degree of freedom, a competition between semi-metal and superfluid behavior is found at the mean-field level. Using the quantum Monte Carlo method, we also investigate the case of strong repulsive interactions. In the Mott phase, each layer exhibits a different amount of long-range magnetic order. Upon coupling both layers, a valence-bond crystal is formed at a critical coupling strength. Finally, we discuss how these bilayer systems could be realized in existing cold atom experiments. |
| 学科主题 | Materials Science |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/22118]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | Grass, T (reprint author), Univ Maryland, Joint Quantum Inst, College Pk, MD 20742 USA.; Grass, T (reprint author), Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, E-08860 Castelldefels, Barcelona, Spain. |
| 推荐引用方式 GB/T 7714 | Grass, T,Chhajlany, RW,Tarruell, L,et al. Proximity effects in cold atom artificial graphene[J]. 2D MATERIALS,2017,4(1):15039. |
| APA | Grass, T.,Chhajlany, RW.,Tarruell, L.,Pellegrini, V.,Lewenstein, M.,...&Grass, T .(2017).Proximity effects in cold atom artificial graphene.2D MATERIALS,4(1),15039. |
| MLA | Grass, T,et al."Proximity effects in cold atom artificial graphene".2D MATERIALS 4.1(2017):15039. |
入库方式： OAI收割
来源：理论物理研究所
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