Disentangling Orbital and Confinement Contributions to <i>g</i>-Factor in Ge/SiGe Hole Quantum Dots.
basic_science · Level V
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- Record sourced from PubMed, PMID 42308145.
- Also identified by DOI 10.1021/acs.nanolett.6c00999.
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Abstract
Spin qubits are typically operated in the lowest orbital of a quantum dot to minimize interference from nearby states. In valence-band hole systems, strong spin-orbit coupling links spin and orbital degrees of freedom, strongly influencing the hole <i>g</i>-factor, a key parameter for qubit control. We investigate the out-of-plane <i>g</i>-factor in Ge quantum dots using excitation (single-particle) and addition (many-body) spectra. Excitation spectra allow us to distinguish the pure Zeeman <i>g</i>-factor from orbital contributions to the magnetic field splitting of states despite the strong spin-orbit coupling. This distinction clarifies discrepancies between <i>g</i>-factors extracted with the two methods, for different orbital states and different hole numbers. Furthermore, we find gate-tunability of <i>g</i>-factors at the level of 15%, highlighting its relevance for all-electric qubit manipulation.