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Title: Emerging many-body effects in semiconductor artificial graphene with low disorder

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.

Authors:
ORCiD logo; ; ; ; ; ; ; ; ; ORCiD logo;
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States); Columbia Univ., New York, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1464294
Alternate Identifier(s):
OSTI ID: 1511485
Grant/Contract Number:  
SC0010695; SC0006671
Resource Type:
Published Article
Journal Name:
Nature Communications
Additional Journal Information:
Journal Name: Nature Communications Journal Volume: 9 Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Du, Lingjie, Wang, Sheng, Scarabelli, Diego, Pfeiffer, Loren N., West, Ken W., Fallahi, Saeed, Gardner, Geoff C., Manfra, Michael J., Pellegrini, Vittorio, Wind, Shalom J., and Pinczuk, Aron. Emerging many-body effects in semiconductor artificial graphene with low disorder. United Kingdom: N. p., 2018. Web. doi:10.1038/s41467-018-05775-4.
Du, Lingjie, Wang, Sheng, Scarabelli, Diego, Pfeiffer, Loren N., West, Ken W., Fallahi, Saeed, Gardner, Geoff C., Manfra, Michael J., Pellegrini, Vittorio, Wind, Shalom J., & Pinczuk, Aron. Emerging many-body effects in semiconductor artificial graphene with low disorder. United Kingdom. doi:10.1038/s41467-018-05775-4.
Du, Lingjie, Wang, Sheng, Scarabelli, Diego, Pfeiffer, Loren N., West, Ken W., Fallahi, Saeed, Gardner, Geoff C., Manfra, Michael J., Pellegrini, Vittorio, Wind, Shalom J., and Pinczuk, Aron. Fri . "Emerging many-body effects in semiconductor artificial graphene with low disorder". United Kingdom. doi:10.1038/s41467-018-05775-4.
@article{osti_1464294,
title = {Emerging many-body effects in semiconductor artificial graphene with low disorder},
author = {Du, Lingjie and Wang, Sheng and Scarabelli, Diego and Pfeiffer, Loren N. and West, Ken W. and Fallahi, Saeed and Gardner, Geoff C. and Manfra, Michael J. and Pellegrini, Vittorio and Wind, Shalom J. and Pinczuk, Aron},
abstractNote = {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.},
doi = {10.1038/s41467-018-05775-4},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United Kingdom},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1038/s41467-018-05775-4

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Cited by: 1 work
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