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  • Letter
  • Open Access

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

Chuyao Tong1,*, Annika Kurzmann1,2, Rebekka Garreis1, Kenji Watanabe3, Takashi Taniguchi4, Thomas Ihn1, and Klaus Ensslin1

  • 1Solid State Physics Laboratory, ETH Zurich, CH-8093 Zurich, Switzerland
  • 22nd Institute of Physics, RWTH Aachen University, Aachen 52074, Germany
  • 3Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • 4International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

  • *ctong@phys.ethz.ch
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Phys. Rev. Research 6, L012006 – Published 11 January, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L012006

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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Outline

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Phys. Rev. Research 6, L012006– Published 11 January, 2024
  • Received 26 May 2023
  • Revised 10 October 2023
  • Accepted 16 November 2023
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