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| 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. | |
| Proximity effects in cold atom artificial graphene | |
| Source Publication | 2D MATERIALS
 |
| Language | 英语 |
| Keyword | Cold Atoms In Optical Lattices Artificial Graphene Superfluidity Proximity Effect |
| Abstract | 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. |
| 2017 | |
| Volume | 4Issue:1Pages:15039 |
| Subject Area | Materials Science |
| DOI | http://dx.doi.org/10.1088/2053-1583/aa50c6 |
| Funding Organization | European Union [339106 OSYRIS, FP7-ICT-2011-9, 600645 SIQS, H2020-FETPROACT-2014, 641122 QUIC, 323714 Equam, PCIG13-GA-2013, 631633 Mag-QUPT] ; European Union [339106 OSYRIS, FP7-ICT-2011-9, 600645 SIQS, H2020-FETPROACT-2014, 641122 QUIC, 323714 Equam, PCIG13-GA-2013, 631633 Mag-QUPT] ; European Union [339106 OSYRIS, FP7-ICT-2011-9, 600645 SIQS, H2020-FETPROACT-2014, 641122 QUIC, 323714 Equam, PCIG13-GA-2013, 631633 Mag-QUPT] ; European Union [339106 OSYRIS, FP7-ICT-2011-9, 600645 SIQS, H2020-FETPROACT-2014, 641122 QUIC, 323714 Equam, PCIG13-GA-2013, 631633 Mag-QUPT] ; Spanish MINECO [FIS2013-46768-P FOQUS, FIS2014-59546-P StrongQSIM, SEV-2015-0522 Severo Ochoa] ; Spanish MINECO [FIS2013-46768-P FOQUS, FIS2014-59546-P StrongQSIM, SEV-2015-0522 Severo Ochoa] ; Spanish MINECO [FIS2013-46768-P FOQUS, FIS2014-59546-P StrongQSIM, SEV-2015-0522 Severo Ochoa] ; Spanish MINECO [FIS2013-46768-P FOQUS, FIS2014-59546-P StrongQSIM, SEV-2015-0522 Severo Ochoa] ; Generalitat de Catalunya [2014 SGR 874] ; Generalitat de Catalunya [2014 SGR 874] ; Generalitat de Catalunya [2014 SGR 874] ; Generalitat de Catalunya [2014 SGR 874] ; German DFG [FOR 2414] ; German DFG [FOR 2414] ; German DFG [FOR 2414] ; German DFG [FOR 2414] ; AFOSR-MURI ; AFOSR-MURI ; AFOSR-MURI ; AFOSR-MURI ; Fundacio Cellex ; Fundacio Cellex ; Fundacio Cellex ; Fundacio Cellex ; KITPC Program 'Spin-orbit-coupled quantum gases' ; KITPC Program 'Spin-orbit-coupled quantum gases' ; KITPC Program 'Spin-orbit-coupled quantum gases' ; KITPC Program 'Spin-orbit-coupled quantum gases' ; ICREA ; ICREA ; ICREA ; ICREA |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itp.ac.cn/handle/311006/22118 |
| Collection | SCI期刊论文 |
| Corresponding Author | 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. |
| Recommended Citation 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. |
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