期刊
PHYSICAL REVIEW LETTERS
卷 123, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.026803
关键词
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资金
- European Graphene Flagship
- Swiss National Science Foundation via NCCR Quantum Science and Technology
- EU Spin-Nano RTN network
- ETH Zurich via the ETH fellowship program
- Swiss National Science Foundation through Division II [163186, 184739]
- CREST, JST [JPMJCR15F3]
- MEXT, Japan
We report ground- and excited-state transport through an electrostatically defined few-hole quantum dot in bilayer graphene in both parallel and perpendicular applied magnetic fields. A remarkably clear level scheme for the two-particle spectra is found by analyzing finite bias spectroscopy data within a two-particle model including spin and valley degrees of freedom. We identify the two-hole ground state to be a spin-triplet and valley-singlet state. This spin alignment can be seen as Hund's rule for a valley-degenerate system, which is fundamentally different from quantum dots in carbon nanotubes, where the two-particle ground state is a spin-singlet state. The spin-singlet excited states are found to be valley-triplet states by tilting the magnetic field with respect to the sample plane. We quantify the exchange energy to be 0.35 meV and measure a valley and spin g factor of 36 and 2, respectively.
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