Gate-Defined Single-Electron Transistors in Twisted Bilayer Graphene
Nano Letters, vol. 25, pp. 6429–6437
Abstract
Twisted bilayer graphene (tBLG) near the magic angle is a unique platform where the combination of topology and strong correlations gives rise to exotic electronic phases. These phases are gate-tunable and related to the presence of flat electronic bands, isolated by single-particle band gaps. This enables gate-controlled charge confinements, essential for the operation of single-electron transistors (SETs), and allows one to explore the interplay of confinement, electron interactions, band renormalization, and the moiré superlattice, potentially revealing key paradigms of strong correlations. Here, we present gate-defined SETs in tBLG with well-tunable Coulomb blockade resonances. These SETs allow us to study magnetic field-induced quantum oscillations in the density of states of the source-drain reservoirs, providing insight into gate-tunable Fermi surfaces of tBLG. Comparison with tight-binding calculations highlights the importance of displacement-field-induced band renormalization crucial for future advanced gate-tunable quantum devices and circuits in tBLG including, e.g., quantum dots and Josephson junction arrays.
Authors 15
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Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Forschungszentrum Jülich GmbH
JARA-FIT and 2 Institute of Physics
Peter Grünberg Institute (PGI-9)
RWTH Aachen University
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Ammon Fischer Aachen
Jülich Aachen Research Alliance · RWTH Aachen University
Affiliation as printed
Institute for Theory of Statistical Physics
RWTH Aachen University, and JARA Fundamentals of Future Information Technology
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Anthony Achtermann Aachen
Affiliation as printed
JARA-FIT and 2 Institute of Physics
RWTH Aachen University
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Eike Icking Aachen
Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Forschungszentrum Jülich GmbH
JARA-FIT and 2 Institute of Physics
Peter Grünberg Institute (PGI-9)
RWTH Aachen University
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K. Hecker Aachen
Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Forschungszentrum Jülich GmbH
JARA-FIT and 2 Institute of Physics
Peter Grünberg Institute (PGI-9)
RWTH Aachen University
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Luca Banszerus Aachen
Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Forschungszentrum Jülich GmbH
JARA-FIT and 2 Institute of Physics
Peter Grünberg Institute (PGI-9)
RWTH Aachen University
-
Affiliation as printed
AMO GmbH,
Gesellschaft für Angewandte Mikro- und Optoelektronik
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Affiliation as printed
Forschungszentrum Jülich GmbH
Helmholtz Nano Facility
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Affiliation as printed
Forschungszentrum Jülich GmbH
Helmholtz Nano Facility
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National Institute for Materials Science
Affiliation as printed
Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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National Institute for Materials Science
Affiliation as printed
Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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Bernd Beschoten Aachen
Affiliation as printed
JARA-FIT and 2 Institute of Physics
RWTH Aachen University
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Robin J. Dolleman Aachen
Affiliation as printed
JARA-FIT and 2 Institute of Physics
RWTH Aachen University
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Dante Marvin Kennes Aachen
Jülich Aachen Research Alliance · Center for Free-Electron Laser Science · Max Planck Institute for the Structure and Dynamics of Matter · RWTH Aachen University
Affiliation as printed
Center for Free Electron Laser Science
Institute for Theory of Statistical Physics
Max Planck Institute for the Structure and Dynamics of Matter
RWTH Aachen University, and JARA Fundamentals of Future Information Technology
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Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Forschungszentrum Jülich GmbH
JARA-FIT and 2 Institute of Physics
Peter Grünberg Institute (PGI-9)
RWTH Aachen University
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