Probing two-electron multiplets in bilayer graphene quantum dots

S Moller; Luca  Banszerus; A. Knothe; C.  Steiner; E.  Icking; S.  Trellenkamp; F.  Lentz; K. Watanabe; T Taniguchi; Leonid I.  Glazman; Vladimir Fal'ko; C.  Volk; Christoph Stampfer

doi:10.1103/PhysRevLett.127.256802

Probing two-electron multiplets in bilayer graphene quantum dots

S Moller, Luca Banszerus, A. Knothe, C. Steiner, E. Icking, S. Trellenkamp, F. Lentz, K. Watanabe, T Taniguchi, Leonid I. Glazman, Vladimir Fal'ko, C. Volk, Christoph Stampfer

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Abstract

We report on finite bias spectroscopy measurements of the two-electron spectrum in a gate defined bilayer graphene (BLG) quantum dot for varying magnetic fields. The spin and valley degree of freedom in BLG give rise to multiplets of 6 orbital symmetric and 10 orbital anti-symmetric states. We find that orbital symmetric states are lower in energy and separated by ≈ 0.4 − 0.8 meV from orbital anti-symmetric states. The symmetric multiplet exhibits an additional energy splitting of its 6 states of ≈ 0.15 − 0.5 meV due to lattice scale interactions. The experimental observations are supported by theoretical calculations, which allow to determine that inter-valley scattering and ’current-current’ interaction constants are of the same magnitude in BLG

Original language	English
Journal	Physical Review Letters
Early online date	15 Dec 2021
DOIs	https://doi.org/10.1103/PhysRevLett.127.256802
Publication status	Published - 15 Dec 2021

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title = "Probing two-electron multiplets in bilayer graphene quantum dots",

abstract = "We report on finite bias spectroscopy measurements of the two-electron spectrum in a gate defined bilayer graphene (BLG) quantum dot for varying magnetic fields. The spin and valley degree of freedom in BLG give rise to multiplets of 6 orbital symmetric and 10 orbital anti-symmetric states. We find that orbital symmetric states are lower in energy and separated by ≈ 0.4 − 0.8 meV from orbital anti-symmetric states. The symmetric multiplet exhibits an additional energy splitting of its 6 states of ≈ 0.15 − 0.5 meV due to lattice scale interactions. The experimental observations are supported by theoretical calculations, which allow to determine that inter-valley scattering and {\textquoteright}current-current{\textquoteright} interaction constants are of the same magnitude in BLG",

author = "S Moller and Luca Banszerus and A. Knothe and C. Steiner and E. Icking and S. Trellenkamp and F. Lentz and K. Watanabe and T Taniguchi and Glazman, {Leonid I.} and Vladimir Fal'ko and C. Volk and Christoph Stampfer",

year = "2021",

month = dec,

day = "15",

doi = "10.1103/PhysRevLett.127.256802",

language = "English",

journal = "Physical Review Letters",

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publisher = "American Physical Society",

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T1 - Probing two-electron multiplets in bilayer graphene quantum dots

AU - Moller, S

AU - Banszerus, Luca

AU - Knothe, A.

AU - Steiner, C.

AU - Icking, E.

AU - Trellenkamp, S.

AU - Lentz, F.

AU - Watanabe, K.

AU - Taniguchi, T

AU - Glazman, Leonid I.

AU - Fal'ko, Vladimir

AU - Volk, C.

AU - Stampfer, Christoph

PY - 2021/12/15

Y1 - 2021/12/15

N2 - We report on finite bias spectroscopy measurements of the two-electron spectrum in a gate defined bilayer graphene (BLG) quantum dot for varying magnetic fields. The spin and valley degree of freedom in BLG give rise to multiplets of 6 orbital symmetric and 10 orbital anti-symmetric states. We find that orbital symmetric states are lower in energy and separated by ≈ 0.4 − 0.8 meV from orbital anti-symmetric states. The symmetric multiplet exhibits an additional energy splitting of its 6 states of ≈ 0.15 − 0.5 meV due to lattice scale interactions. The experimental observations are supported by theoretical calculations, which allow to determine that inter-valley scattering and ’current-current’ interaction constants are of the same magnitude in BLG

AB - We report on finite bias spectroscopy measurements of the two-electron spectrum in a gate defined bilayer graphene (BLG) quantum dot for varying magnetic fields. The spin and valley degree of freedom in BLG give rise to multiplets of 6 orbital symmetric and 10 orbital anti-symmetric states. We find that orbital symmetric states are lower in energy and separated by ≈ 0.4 − 0.8 meV from orbital anti-symmetric states. The symmetric multiplet exhibits an additional energy splitting of its 6 states of ≈ 0.15 − 0.5 meV due to lattice scale interactions. The experimental observations are supported by theoretical calculations, which allow to determine that inter-valley scattering and ’current-current’ interaction constants are of the same magnitude in BLG

U2 - 10.1103/PhysRevLett.127.256802

DO - 10.1103/PhysRevLett.127.256802

M3 - Article

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

ER -

Probing two-electron multiplets in bilayer graphene quantum dots

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