Fabrication and Characterization of Dopant-based 2D Lattices for Analog Quantum Simulation of an Extended Fermi Hubbard Model

ORAL

Abstract

The Hubbard model is one of the primary models for understanding the essential many-body physics in condensed matter systems such as Mott insulators and cuprate high-Tc superconductors. Recent advances in atomically precise fabrication in silicon using scanning tunneling microscopy (STM) have made possible atom-by-atom fabrication of single and few-dopant quantum dots and atomic-scale control of tunneling in dopant-based devices, enabling the engineering of dopant-based artificial lattices with atomic-scale precision. In this talk, we present our recent experimental implementation of STM-fabricated 3x3 arrays of few-dopant quantum dots as a tunable 2D artificial lattice. We discuss tuning of the array parameters, such as the electron ensemble, hopping and long-range interactions, and thermal activations within the arrays, and probing different many-body properties within the array using low-temperature transport. The results demonstrate the viability of simulating extended Fermi-Hubbard Hamiltonians using dopant-based 2D artificial lattices having finite disorder. 

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Publication: Wang X, Khatami E, Fei F, Wyrick J, Namboodiri P, Kashid R, Rigosi AF, Bryant G, Silver R. Quantum Simulation of an Extended Fermi-Hubbard Model Using a 2D Lattice of Dopant-based Quantum Dots. arXiv preprint arXiv:2110.08982. (2021).

Presenters

  • Xiqiao Wang

    • University of Maryland, College Park
    • National Institute of Standards and Technology
    • National Institute of Standards and Technology, JQI

Authors

  • Xiqiao Wang

    • University of Maryland, College Park
    • National Institute of Standards and Technology
    • National Institute of Standards and Technology, JQI

  • Ehsan Khatami

    • San Jose
    • San Jose State University

  • Fan Fei

    • University of Maryland, College Park
    • National Institute of Standards and Technology, University of Maryland

  • Jonathan Wyrick

    • National Institute of Standards and Tech
    • National Institute of Standards and Technology

  • Pradeep Namboodiri

    • National Institute of Standards and Technology

  • ranjit V Kashid

    • National Institute of Standards and Technology

  • Albert F Rigosi

    • National Institute of Standards and Technology
    • National Institute of Standards and Tech

  • Garnett W Bryant

    • National Institute of Standards and Technology
    • National Institute of Standards and Tech
    • National Institute of Standards and Technology, JQI

  • Richard M Silver

    • National Institute of Standards and Technology