ITP OpenIR  > 理论物理所2017年知识产出
Proximity effects in cold atom artificial graphene
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.
2017
发表期刊2D MATERIALS
卷号4期号:1页码:15039
文章类型Article
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.
关键词Cold Atoms In Optical Lattices Artificial Graphene Superfluidity Proximity Effect
学科领域Materials Science
资助者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] ; Generalitat de Catalunya [2014 SGR 874] ; Generalitat de Catalunya [2014 SGR 874] ; German DFG [FOR 2414] ; German DFG [FOR 2414] ; AFOSR-MURI ; AFOSR-MURI ; Fundacio Cellex ; Fundacio Cellex ; KITPC Program 'Spin-orbit-coupled quantum gases' ; KITPC Program 'Spin-orbit-coupled quantum gases' ; ICREA ; ICREA ; 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] ; Generalitat de Catalunya [2014 SGR 874] ; Generalitat de Catalunya [2014 SGR 874] ; German DFG [FOR 2414] ; German DFG [FOR 2414] ; AFOSR-MURI ; AFOSR-MURI ; Fundacio Cellex ; Fundacio Cellex ; KITPC Program 'Spin-orbit-coupled quantum gases' ; KITPC Program 'Spin-orbit-coupled quantum gases' ; ICREA ; ICREA
DOIhttp://dx.doi.org/10.1088/2053-1583/aa50c6
关键词[WOS]EXTENDED HUBBARD-MODEL ; BOSE-EINSTEIN CONDENSATION ; ULTRACOLD FERMIONS ; OPTICAL LATTICE ; GROUND-STATE ; DIRAC POINTS ; ANTIFERROMAGNETIC CORRELATIONS ; HONEYCOMB LATTICE ; BLOCH BAND ; SPIN
语种英语
资助者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] ; Generalitat de Catalunya [2014 SGR 874] ; Generalitat de Catalunya [2014 SGR 874] ; German DFG [FOR 2414] ; German DFG [FOR 2414] ; AFOSR-MURI ; AFOSR-MURI ; Fundacio Cellex ; Fundacio Cellex ; KITPC Program 'Spin-orbit-coupled quantum gases' ; KITPC Program 'Spin-orbit-coupled quantum gases' ; ICREA ; ICREA ; 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] ; Generalitat de Catalunya [2014 SGR 874] ; Generalitat de Catalunya [2014 SGR 874] ; German DFG [FOR 2414] ; German DFG [FOR 2414] ; AFOSR-MURI ; AFOSR-MURI ; Fundacio Cellex ; Fundacio Cellex ; KITPC Program 'Spin-orbit-coupled quantum gases' ; KITPC Program 'Spin-orbit-coupled quantum gases' ; ICREA ; ICREA
WOS类目Materials Science, Multidisciplinary
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/22118
专题理论物理所2017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.
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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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