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  • Title: Emerging many-body effects in semiconductor artificial graphene with low disorder.
    Author: Du L, Wang S, Scarabelli D, Pfeiffer LN, West KW, Fallahi S, Gardner GC, Manfra MJ, Pellegrini V, Wind SJ, Pinczuk A.
    Journal: Nat Commun; 2018 Aug 17; 9(1):3299. PubMed ID: 30120251.
    Abstract:
    The interplay between electron-electron interactions and the honeycomb topology is expected to produce exotic quantum phenomena and find applications in advanced devices. Semiconductor-based artificial graphene (AG) is an ideal system for these studies that combines high-mobility electron gases with AG topology. However, to date, low-disorder conditions that reveal the interplay of electron-electron interaction with AG symmetry have not been achieved. Here, we report the creation of low-disorder AG that preserves the near-perfection of the pristine electron layer by fabricating small period triangular antidot lattices on high-quality quantum wells. Resonant inelastic light scattering spectra show collective spin-exciton modes at the M-point's nearly flatband saddle-point singularity in the density of states. The observed Coulomb exchange interaction energies are comparable to the gap of Dirac bands at the M-point, demonstrating interplay between quasiparticle interactions and the AG potential. The saddle-point exciton energies are in the terahertz range, making low-disorder AG suitable for contemporary optoelectronic applications.
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