Journal Article

FZJ-2025-02651

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Gate-Defined Single-Electron Transistors in Twisted Bilayer Graphene

Rothstein, A. (Corresponding author)RWTH* ; Fischer, A.RWTH* ; Achtermann, A.FZJ* ; Icking, E.RWTH* ; Hecker, K.RWTH* ; Banszerus, L.RWTH* ; Otto, M. ; Trellenkamp, S.FZJ* ; Lentz, F.FZJ* ; Watanabe, K. ; Taniguchi, T. ; Beschoten, B.RWTH* ; Dolleman, R. J.RWTH* ; Kennes, D. M.RWTH* ; Stampfer, C. (Corresponding author)FZJ*RWTH*

2025
ACS Publ. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.nanolett.4c06492

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.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA-FIT (JARA-FIT)
3. Helmholtz - Nanofacility (HNF)

Research Program(s):

1. 5222 - Exploratory Qubits (POF4-522) (POF4-522)
2. 2D4QT - 2D Materials for Quantum Technology (820254) (820254)
3. DFG project G:(GEPRIS)535377524 - Quantenpunkte in verdrehtem und proximity-gekoppeltem zweilagigen Graphen (535377524) (535377524)
4. DFG project G:(GEPRIS)390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769) (390534769)
5. DFG project G:(GEPRIS)437214324 - Durchstimmbare Twistronics: Lokales Tuning und lokale Detektion topologischer Randzustände und Supraleitung in Zweilagigen-Graphen (437214324) (437214324)
6. DFG project G:(GEPRIS)471733165 - Moiré-verstärkte Infrarot-Photodetektion und THz-Emission in verdrehten Graphen-Übergittern (471733165) (471733165)
7. DFG project G:(GEPRIS)534269806 - Terahertz-Quantensensorik mit Zweilagigen-Graphen Quantenpunkten in Resonatoren (534269806) (534269806)

Appears in the scientific report 2025

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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