Pauli blockade catalogue and three- and four-particle Kondo effect in bilayer graphene quantum dots

Abstract

Pauli blockade is a fundamental quantum phenomenon that also serves as a powerful tool for qubit manipulation and read-out. 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 catalogue 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 catalogue provides an abundance of novel qubit operational possibilities and opportunities to explore intriguing spin and valley physics.

11 pages, 6 figures

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• Gate-induced insulating state in bilayer graphene devices
• Asymmetry gap in the electronic band structure of bilayer graphene
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• Theory of tunneling spectra for a few-electron bilayer graphene quantum dot

Cited by in corpus (7)

• Extended Hubbard model describing small multi-dot arrays in bilayer graphene
• Switching spin filling sequence in a bilayer graphene quantum dot through trigonal warping
• Dipole coupling of a bilayer graphene quantum dot to a high-impedance microwave resonator
• Electric-field independent spin-orbit coupling gap in hBN-encapsulated bilayer graphene
• RFSoC-based radio-frequency reflectometry in gate-defined bilayer graphene quantum devices
• The role of antisymmetric orbitals and electron-electron interactions on the two-particle spin and valley blockade in graphene double quantum dots
• Radio-frequency charge detection on graphene electron-hole double quantum dots