Low-disorder artificial graphene in nano-patterned triangular antidot lattice of GaAs Heterostructure

ORAL

Abstract

Artificial graphene (AG) in semiconductors have been realized with honeycomb dot lattices [1] on 2D electron systems in GaAs quantum well to serve as advanced quantum simulators for probing novel electron behavior. Small period triangular antidot lattices, where well-defined massless Dirac fermions occur, have not been realized. Here, we report on recent experiments in low-disorder triangular antidot lattice and exploration of collective modes in created electron states by optical spectroscopy experiments using photoluminescence and resonant inelastic light scattering (RILS) at low temperature[2]. Using the cutting-edge fabrication technology, we fabricated small-period triangular antidot lattice (as small as 70 nm), which has an effective honeycomb lattice constant of about 40nm, on GaAs quantum well. In the RILS measurement, the massless Dirac fermions are clearly revealed by the intersubband transition and low energy transitions, well described by modeling the AG band structure. Interplay between quasiparticle interactions and lattice topology will be discussed. [1] S. Wang, et al. accepted in Nature nano. [2] L. Du, et al., in preparation.

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Presenters

  • Lingjie Du

    Department of Applied Physics and Applied Mathematics, Columbia University

Authors

  • Lingjie Du

    Department of Applied Physics and Applied Mathematics, Columbia University

  • Sheng Wang

    Department of Applied Physics and Applied Mathematics, Columbia University

  • Loren Pfeiffer

    Electrical Engineering, princeton university, Department of Electrical Engineering, Princeton University, Princeton University, Princeton Univ, Electrical Engineering, Princeton Univ, EE, Princeton University

  • K West

    Electrical Engineering, princeton university, Department of Electrical Engineering, Princeton University, Princeton University, Univ of Basel, Princeton Univ, Electrical Engineering, Princeton Univ, EE, Princeton University

  • Saeed Fallahi

    Purdue University, Physics, Purdue University, Purdue Univ, Department of Physics and Astronomy, and School of Materials Engineering, and School of Electrical and Computer Engineering, Purdue University

  • Michael Manfra

    Department of Physics and Astronomy and Station Q Purdue, Purdue University, Department of Physics and Astronomy and Microsoft Station Q Purdue, Purdue University, Purdue University, Physics, Purdue University, Purdue University, Station Q Purdue, Purdue Univ, Department of Physics and Astronomy, and School of Materials Engineering, and School of Electrical and Computer Engineering, Purdue University, Physics and Astronomy, Purdue University, Dept. of Physics and Astronomy, Purdue Univ

  • Vittorio Pellegrini

    Graphene Labs, Istituto Italiano di Tecnologia

  • Shalom Wind

    Department of Applied Physics and Applied Mathematics, Columbia University

  • Aron Pinczuk

    Department of Applied Physics and Applied Mathematics and Department of Physics, Columbia University