Department of Physics & Astronomy

Spring 2009 Colloquia


Na Young Kim

Na Young Kim

Ginzton Laboratory, Stanford
Institute of Industrial Science, University of Tokyo
Towards Solid-state Bose-Hubbard Quantum Simulators
March 30, 2009, 4PM

The Hubbard model is the conceptually simplest but standard theoretical framework, which has been ubiquitously used to explore strongly-correlated condensed matter systems. Due to the lack of exact analytical solutions in higher dimensions and computational limitations in numerical analysis, complete knowledge of the Hubbard model beyond in one dimension is yet to be attained, and its complete link to experimental signatures has been elusive. Quantum simulation of the Hubbard model offers an alternative route to investigate the physics of the model since a quantum simulator outperforms a classical counterpart as it handles intractable quantum many-body systems.

Much progress towards the implementation of Hubbard-model quantum simulators has been actively achieved using bosonic and fermionic [3] ultracold atoms in optical lattices. Here we propose a solid-state analog of Bose-Hubbard Hubbard models using GaAs microcavity exciton-polaritons. I will present our recent experimental progress regarding superfluid states of exciton-polaritons under a one-dimensional periodic lattice potential [4, 5]. This work is a precursor to explore quantum phase transition in a two-dimensional Bose-Hubbard quantum simulator.

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