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Showing 1–7 of 7 results
Advanced filters: Author: Andreas Hemmerich Clear advanced filters

  • Atoms trapped in optical lattices have been used successfully to study many-body phenomena. But the shape that bosonic ground-state wavefunctions can take is limited, compromising the usefulness of this approach. Such limitations, however, do not apply to excited states of bosons. An atomic superfluid that has now been realized in such a higher-energy band promises to provide insight into a wider range of many-body effects.

    • Georg Wirth
    • Matthias Ölschläger
    • Andreas Hemmerich
    Research
    Nature Physics
    Volume: 7, P: 147-153

  • The realization of ultracold molecules in higher bands of an optical lattice sets the stage for the study of the interplay between orbital physics and the Bose–Einstein condensation and Bardeen–Cooper–Schrieffer superfluidity crossover.

    • Yann Kiefer
    • Max Hachmann
    • Andreas Hemmerich
    ResearchOpen Access
    Nature Physics
    Volume: 19, P: 794-799

  • A globally chiral atomic superfluid is induced by time-reversal symmetry breaking in an optical lattice and exhibits global angular momentum, which is expected to lead to topological excitations and the demonstration of a topological superfluid.

    • Xiao-Qiong Wang
    • Guang-Quan Luo
    • Zhi-Fang Xu
    ResearchOpen Access
    Nature
    Volume: 596, P: 227-231

  • Experimental progress has made it possible to load fermionic atoms into higher orbital bands. Such systems provide a platform for studying quantum states of matter that have no prior analogues in solid-state materials. This theoretical study predicts a semimetallic topological state in these systems, which can be turned into a topological insulating phase.

    • Kai Sun
    • W. Vincent Liu
    • S. Das Sarma
    Research
    Nature Physics
    Volume: 8, P: 67-70

  • Ultracold atomic gases provide a playground for exploring exotic quantum phases, like superfluids with staggered orbital currents. Li et al.show that thermal fluctuations can destroy such a state in two stages, revealing a new intermediate chiral Bose liquid with a striking dynamical fingerprint.

    • Xiaopeng Li
    • Arun Paramekanti
    • W. Vincent Liu
    Research
    Nature Communications
    Volume: 5, P: 1-8