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Quantum phase transition to unconventional multi-orbital superfluidity in optical lattices

Parvis Soltan-Panahi, Dirk-Sören Lühmann, Julian Struck +2 more

arXiv:1104.3456Nature PhysicsOct 30, 2011176 citations

Superfluidity of Bosonic Atoms in Multi-Band Optical Lattices

S. M. Giampaolo, Fabrizio Illuminati, G. Mazzarella +1 more

Mar 4, 20040 citations

Realizing a fermionic superfluid state from a band insulator in an optical lattice

Yogeshwar P. Saraswat, Amal Medhi, Vijay B. Shenoy

Bulletin of the American Physical SocietyMar 1, 20120 citations

Interaction-induced chiral px ± ipy superfluid order of bosons in an optical lattice

Matthias Ölschläger, T. Kock, Georg Wirth +3 more

The study of superconductivity with unconventional order is complicated in condensed matter systems by their extensive complexity. Optical lattices with their exceptional precision and control allow one to emulate superfluidity avoiding many of the complications of condensed matter. A promising approach to realize unconventional superfluid order is to employ orbital degrees of freedom in higher Bloch bands. In recent work, indications were found that bosons condensed in the second band of an optical chequerboard lattice might exhibit p x ± i p y order. Here we present experiments, which provide strong evidence for the emergence of p x ± i p y order driven by the interaction in the local p-orbitals. We compare our observations with a multi-band Hubbard model and find excellent quantitative agreement.The study of superconductivity with unconventional order is complicated in condensed matter systems by their extensive complexity. Optical lattices with their exceptional precision and control allow one to emulate superfluidity avoiding many of the complications of condensed matter. A promising approach to realize unconventional superfluid order is to employ orbital degrees of freedom in higher Bloch bands. In recent work, indications were found that bosons condensed in the second band of an optical chequerboard lattice might exhibit p x ± i p y order. Here we present experiments, which provide strong evidence for the emergence of p x ± i p y order driven by the interaction in the local p-orbitals. We compare our observations with a multi-band Hubbard model and find excellent quantitative agreement.

arXiv:1305.1177New Journal of PhysicsAug 22, 201352 citations

Spin-Domain and Superfluid Transition in a shaken optical lattice

Li-Chung Ha, Colin Parker, Karina Jiménez-García +1 more

Bulletin of the American Physical SocietyJun 3, 20140 citations

Realization of 87Rb Bose–Einstein Condensates in Higher Bands of a Hexagonal Boron-Nitride Optical Lattice

Jin-Yu Liu, Xiaoqiong Wang, Zhi-Fang Xu

Ultracold neutral atoms in higher bands of an optical lattice provide a natural avenue to emulate orbital physics in solid state materials. Here, we report the realization of 87Rb Bose–Einstein condensates in the fourth and seventh Bloch bands of a hexagonal boron-nitride optical lattice, exhibiting remarkably long coherence time through active cooling. Using band mapping spectroscopy, we observe that atoms condensed at the energy minimum of Γ point (K 1 and K 2 points) in the fourth (seventh) band as sharp Bragg peaks. The lifetime for the condensate in the fourth (seventh) band is about 57.6 (4.8) ms, and the phase coherence of atoms in the fourth band persists for a long time larger than 110 ms. Our work thus offers great promise for studying unconventional bosonic superfluidity of neutral atoms in higher bands of optical lattices.Ultracold neutral atoms in higher bands of an optical lattice provide a natural avenue to emulate orbital physics in solid state materials. Here, we report the realization of 87Rb Bose–Einstein condensates in the fourth and seventh Bloch bands of a hexagonal boron-nitride optical lattice, exhibiting remarkably long coherence time through active cooling. Using band mapping spectroscopy, we observe that atoms condensed at the energy minimum of Γ point (K 1 and K 2 points) in the fourth (seventh) band as sharp Bragg peaks. The lifetime for the condensate in the fourth (seventh) band is about 57.6 (4.8) ms, and the phase coherence of atoms in the fourth band persists for a long time larger than 110 ms. Our work thus offers great promise for studying unconventional bosonic superfluidity of neutral atoms in higher bands of optical lattices.

Chinese Physics LettersJul 1, 20232 citations

Unconventional superfluidity in higher bands of an optical lattice

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