Pauli blockade catalogue and three- and four-particle Kondo effect in bilayer graphene quantum dots
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Date
2024-01
Publication Type
Journal Article
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yes
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Abstract
Pauli blockade is a fundamental quantum phenomenon that also serves as a powerful tool for qubit manipulation and readout. While most systems exhibit a simple even-odd pattern of double-dot Pauli spin blockade due to the preferred singlet pairing of spins, the additional valley degree of freedom offered by bilayer graphene greatly alters this pattern. Inspecting bias-triangle measurements at double-dot charge degeneracies with up to four electrons in each dot reveals a much richer double-dot Pauli blockade catalog with both spin and/or valley blockade. In addition, we use single-dot Kondo effect measurements to substantiate our understanding of the three- and four-particle state spectra by analyzing their magnetic field dependence. With high controllability and reported long valley- and spin-relaxation times, bilayer graphene is a rising platform for hosting semiconductor quantum dot qubits. A thorough understanding of state spectra is crucial for qubit design and manipulation, and the rich Pauli blockade catalog provides an abundance of qubit operational possibilities and opportunities to explore intriguing spin and valley physics.
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published
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Volume
6 (1)
Pages / Article No.
Publisher
American Physical Society
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Subject
Coulomb blockade; Kondo effect; Spin blockade; Valley degrees of freedom; Bilayer graphene; Double quantum dots; Quantum dots
Organisational unit
03439 - Ensslin, Klaus / Ensslin, Klaus
08835 - Ihn, Thomas (Tit.-Prof.)
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
Notes
Funding
951541 - Entropy in engineered quantum systems — Mesoscopic thermodynamics of correlated quantum states (EC)
862660 - Toward new era of quantum electrical measurements through phase slips (EC)
185902 - QSIT - Quantum Science and Technology (SNF)
766025 - QUantum Electronics Science and TECHnology training (EC)
862660 - Toward new era of quantum electrical measurements through phase slips (EC)
185902 - QSIT - Quantum Science and Technology (SNF)
766025 - QUantum Electronics Science and TECHnology training (EC)