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Bosons in high orbital bands: unconventional BEC beyond the “no-node” paradigm.

Novel Orbital Physics with Cold Atoms in Optical Lattices Congjun Wu, University of California-San Diego, DMR 0804775. Bosons in high orbital bands: unconventional BEC beyond the “no-node” paradigm.

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Bosons in high orbital bands: unconventional BEC beyond the “no-node” paradigm.

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  1. Novel Orbital Physics with Cold Atoms in Optical LatticesCongjun Wu, University of California-San Diego, DMR 0804775 • Bosons in high orbital bands: unconventional BEC beyond the “no-node” paradigm. • Conventional BECs obey Feynman’s no-node theorem, thus time reversal (TR) symmetry cannot be spontaneously broken. • Orbital bosons are meta-stable excited states, thus are exempt from this paradigm. They exhibit complex-valued condensation wavefunctions developing onsite orbital angular momentum (OAM) polarizations, and thus break TR symmetry spontaneously. The on-site OAM pattern of the p-orbital BEC in the triangular lattice. • px,y-orbital fermions in the honeycomb optical lattice – fundamentally different physics from graphene. • Strong correlation effects: exact solution of Wigner crystallization and ferromagnetism. • p-orbital Mott insulators not easily accessible in solid state systems: orbital exchange; a new type of frustrated magnet-like model. Flat-band structure + Dirac cone. Frustrated orbital exchange.

  2. Activities of the project “orbital physics with cold atoms”Congjun Wu, University of California-San Diego, DMR 0804775 • Education: • Classroom teaching: parts of the project results are incorporated into the teaching of quantum mechanics and solid state physics courses. The symmetry principle and topology analysis are emphasized. • Guiding students and postdocs at UCSD: Hsiang-hsuan Hung, Chris Chan (Ph. D. students), and Wei-Cheng Lee (Postdoctoral researcher). • Outreach: • Lecture to high school students “Superfluidity, superconductivity, and Bose-Einstein condensation”. • Research orientation to perspective graduate students in the “Physics open house”. • Presentations: • Many invited talks at prestigious universities, research institutes, including Stanford, Caltech, University of Michigan, UCLA, etc. • Many invited talks at conferences: APS march meeting 2009, Physics of Quantum Electronics 2009, KITP conference on “Low dimensional electron gases”, Canadian Institute for Advanced Studies conference on cold atoms, etc.

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