Pulsed-gate spectroscopy of single-electron spin states in bilayer graphene quantum dots

Banszerus, Luca; Hecker, Katrin; Icking, Eike; Trellenkamp, Stefan; Lentz, Florian; Neumaier, Daniel; Watanabe, Kenji; Taniguchi, Takashi; Volk, Christian; Stampfer, Christoph

doi:10.48550/arxiv.2012.02555

Cited by 2 publications

(2 citation statements)

References 39 publications

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“…This confinement method offers immense gate-control of the nanostructure, e.g., the confinement width, depth, barriers, and bilayer graphene gap. It is now possible to operate such an electrostatically confined bilayer graphene dot controllably in the single and few-electron regime [11][12][13][14][15][16][17][18][19][20]. The rapid experimental progress in device design, quality, and control, calls for a theoretical investigation of single and few-electron tunnelling processes in such structures.…”

Section: Introductionmentioning

confidence: 99%

Tunneling theory for a bilayer graphene quantum dot’s single- and two-electron states

2022

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The tuneability and control of quantum nanostructures in two-dimensional materials offer promising perspectives for their use in future electronics. It is hence necessary to analyze quantum transport in such nanostructures. Material properties such as a complex dispersion, topology, and charge carriers with multiple degrees of freedom, are appealing for novel device functionalities but complicate their theoretical description. Here, we study quantum tunnelling transport across a few-electron bilayer graphene quantum dot. We demonstrate how to uniquely identify single- and two-electron dot states' orbital, spin, and valley composition from differential conductance in a finite magnetic field. Furthermore, we show that the transport features manifest splittings in the dot's spin and valley multiplets induced by interactions and magnetic field (the latter splittings being a consequence of bilayer graphene's Berry curvature). Our results elucidate spin- and valley-dependent tunnelling mechanisms and will help to utilize bilayer graphene quantum dots, e.g., as spin and valley qubits.

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Section: Introductionmentioning

confidence: 99%

Tunneling theory for a bilayer graphene quantum dot’s single- and two-electron states

2022

View full text Add to dashboard Cite

show abstract

“…This confinement method offers immense gate-control of the nanostructure, e.g., the confinement width, depth, barriers, and bilayer graphene gap. It is now possible to operate such an electrostatically confined bilayer graphene dot controllably in the single and few-electron regime [11][12][13][14][15][16][17][18][19] . The rapid experimental progress in device design, quality, and control, calls for a theoretical investigation of single and few-electron tunnelling processes in such structures.…”

Section: Introductionmentioning

confidence: 99%

Theory of tunneling spectra for a few-electron bilayer graphene quantum dot

Knothe,

Glazman,

Fal'ko

2021

Preprint

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The tuneability and control of quantum nanostructures in two-dimensional materials offer promising perspectives for their use in future electronics. It is hence necessary to analyze quantum transport in such nanostructures. Material properties such as a complex dispersion, topology, and charge carriers with multiple degrees of freedom, are appealing for novel device functionalities but complicate their theoretical description. Here, we study quantum tunnelling transport across a few-electron bilayer graphene quantum dot. We demonstrate how to uniquely identify single-and two-electron dot states' orbital, spin, and valley composition from differential conductance in a finite magnetic field. Furthermore, we show that the transport features manifest splittings in the dot's spin and valley multiplets induced by interactions and magnetic field (the latter splittings being a consequence of bilayer graphene's Berry curvature). Our results elucidate spin-and valley-dependent tunnelling mechanisms and will help to utilize bilayer graphene quantum dots, e.g., as spin and valley qubits.

show abstract

Pulsed-gate spectroscopy of single-electron spin states in bilayer graphene quantum dots

Cited by 2 publications

References 39 publications

Tunneling theory for a bilayer graphene quantum dot’s single- and two-electron states

Tunneling theory for a bilayer graphene quantum dot’s single- and two-electron states

Theory of tunneling spectra for a few-electron bilayer graphene quantum dot

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