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Simulating heavy fermion physics in optical lattice: Periodic Anderson model with harmonic trapping potential

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Abstract

The periodic Anderson model (PAM), where local electron orbitals interplay with itinerant electronic carriers, plays an essential role in our understanding of heavy fermion materials. Motivated by recent proposals for simulating the Kondo lattice model (KLM) in terms of alkaline-earth metal atoms, we take another step toward the simulation of PAM, which includes the crucial charge/valence fluctuation of local f-electrons beyond purely low-energy spin fluctuation in the KLM. To realize PAM, a transition induced by a suitable laser between the electronic excited and ground state of alkaline-earth metal atoms (1 S 0⇌3 P 0) is introduced. This leads to effective hybridization between local electrons and conduction electrons in PAM. Generally, the SU(N) version of PAM can be realized by our proposal, which gives a unique opportunity to detect large-N physics without complexity in realistic materials. In the present work, high-temperature physical features of standard [SU(2)] PAM with harmonic trapping potential are analyzed by quantum Monte Carlo and dynamic mean-field theory, where the Mott/orbital-selective Mott state was found to coexist with metallic states. Indications for near-future experiments are provided. We expect our theoretical proposal and (hopefully) forthcoming experiments will deepen our understanding of heavy fermion systems. At the same time, we hope these will trigger further studies on related Mott physics, quantum criticality, and non-trivial topology in both the inhomogeneous and nonequilibrium realms.

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Acknowledgements

We thank Congjun Wu for helpful discussion on SU(N) physics, and Ren Zhang for discussions about orbital Feshbach Resonance. This research was supported in part by the National Natural Science Foundation of China under Grant Nos. 11325417, 11674139, and 11504061, the China Postdoctoral Science Foundation, and the Foundation of LCP.

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Authors and Affiliations

  1. Center for Interdisciplinary Studies & Key Laboratory for Magnetism and Magnetic Materials of the MoE, Lanzhou University, Lanzhou, 730000, China

    Yin Zhong & Hong-Gang Luo

  2. LCP, Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China

    Yu Liu

  3. Software Center for High Performance Numerical Simulation, China Academy of Engineering Physics, Beijing, 100088, China

    Yu Liu

  4. Beijing Computational Science Research Center, Beijing, 100084, China

    Hong-Gang Luo

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  1. Yin Zhong
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  2. Yu Liu
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Correspondence to Yin Zhong.

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arXiv: 1610.04372.

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Zhong, Y., Liu, Y. & Luo, HG. Simulating heavy fermion physics in optical lattice: Periodic Anderson model with harmonic trapping potential. Front. Phys. 12, 127502 (2017). https://doi.org/10.1007/s11467-017-0690-x

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