Modeling charge relaxation in graphene quantum dots induced by electron-phonon interaction

Reichardt, Sven; Stampfer, Christoph

doi:10.1103/physrevb.93.245423

Cited by 3 publications

(2 citation statements)

References 41 publications

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“…The nature of these resonances can be explained in terms of transitions from single-particle states in the left QD (QD L ) to single-particle states in the right QD (QD R ). For the present interdot tunneling times (≈ 10 ns), we assume that the electron spin is entirely conserved, while phonon-assisted valley relaxation may occur on these time scales, as well as during interdot tunneling 26 . We consider the combined tunneling rate, Γ comb to be limited by the interdot tunneling rate, Γ m : I / e = Γ comb ≈ Γ m , where I is the current through the DQD device and e the elementary charge.…”

Section: Resultsmentioning

confidence: 99%

Spin-valley coupling in single-electron bilayer graphene quantum dots

et al. 2021

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Understanding how the electron spin is coupled to orbital degrees of freedom, such as a valley degree of freedom in solid-state systems, is central to applications in spin-based electronics and quantum computation. Recent developments in the preparation of electrostatically-confined quantum dots in gapped bilayer graphene (BLG) enable to study the low-energy single-electron spectra in BLG quantum dots, which is crucial for potential spin and spin-valley qubit operations. Here, we present the observation of the spin-valley coupling in bilayer graphene quantum dots in the single-electron regime. By making use of highly-tunable double quantum dot devices we achieve an energy resolution allowing us to resolve the lifting of the fourfold spin and valley degeneracy by a Kane-Mele type spin-orbit coupling of ≈ 60 μeV. Furthermore, we find an upper limit of a potentially disorder-induced mixing of the $$K$$ K and $$K^{\prime}$$ K ′ states below 20 μeV.

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Section: Resultsmentioning

confidence: 99%

Spin-valley coupling in single-electron bilayer graphene quantum dots

et al. 2021

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“…The nature of these resonances can be explained in terms of transitions from single particle states in the left QD (QD L ) to single particle states in the right QD (QD R ). For the present interdot tunneling times (≈ 10 ns [27]), we assume that the electron spin is entirely conserved, while phonon assisted valley relaxation may occur on these time scales, as well as during interdot tunneling [28]. Fig.…”

mentioning

confidence: 99%

Spin-valley coupling in single-electron bilayer graphene quantum dots

Banszerus,

Möller,

Steiner

et al. 2021

Preprint

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Understanding how the electron spin is coupled to orbital degrees of freedom, such as a valley degree of freedom in solid-state systems is central to applications in spin-based electronics and quantum computation. Recent developments in the preparation of electrostatically-confined quantum dots in gapped bilayer graphene (BLG) enable to study the low-energy single-electron spectra in BLG quantum dots, which is crucial for potential spin and spin-valley qubit operations. Here, we present the observation of the spin-valley coupling in a bilayer graphene quantum dot in the single-electron regime. By making use of a highly-tunable double quantum dot device we achieve an energy resolution allowing us to resolve the lifting of the fourfold spin and valley degeneracy by a Kane-Mele type spin-orbit coupling of ≈ 65 µeV. Also, we find an upper limit of a potentially disorder-induced mixing of the K and K states below 20 µeV.

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