Spontaneous Magnetization of Harmonically Trapped Ultracold Fermions in an Optical Lattice

ORAL

Abstract

We use a single-band Fermi Hubbard Hamiltonian to study the ground states of a system of ultracold fermions in a one dimensional optical lattice with an external harmonic trap. We perform simulations using exact diagonalization for small systems with one to five wells and we employ Vidal's algorithm (Time Evolving Block Decimation) for larger systems with up to a hundred wells. As the trapping frequency increases we observe spontaneous transverse magnetization at the edges of the trap. We present a theoretical interpretation of this intriguing result, and discuss how it can be observed in experiments.

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Authors

  • R.C. Brown

    Physics Department, Colorado School of Mines, Golden, Colorado 80401, USA

  • L. D. Carr

    Physics Department, Colorado School of Mines, Dept. of Physics, Colorado School of Mines, Golden, CO 80401 USA, Physics Department, Colorado School of Mines, Golden, CO, 80401, Colorado School of Mines, Physics Department, Colorado School of Mines, Golden, CO 80401, Physics Department, Colorado School of Mines, Golden, CO, USA, Physics Department, Colorado School of Mines, Golden, Colorado 80401, USA

  • I. Danshita

    Electron and Optical Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

  • J.E. Williams

    Electron and Optical Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

  • Charles Clark

    National Institute of Standards and Technology, Electron and Optical Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA, NIST