ITP OpenIR  > SCI期刊论文
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 Publication2D MATERIALS
Language英语
KeywordCold Atoms In Optical Lattices Artificial Graphene Superfluidity Proximity Effect
AbstractCold 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
Volume4Issue:1Pages:15039
Subject AreaMaterials Science
DOIhttp://dx.doi.org/10.1088/2053-1583/aa50c6
Funding OrganizationEuropean 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
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/22118
CollectionSCI期刊论文
Corresponding AuthorGrass, 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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