Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session G39: Semiconductor Qubits IV
11:30 AM–2:30 PM,
Tuesday, March 15, 2022
Room: McCormick Place W-196A
Sponsoring
Units:
DQI DCMP
Chair: Xinxin Cai, Rochester
Abstract: G39.00012 : Particle-hole symmetry protects spin-valley blockade in graphene quantum dots
2:06 PM–2:18 PM
Presenter:
Luca Banszerus
(RWTH Aachen University)
Authors:
Luca Banszerus
(RWTH Aachen University)
Samuel Moeller
(RWTH Aachen University)
Eike Icking
(RWTH Aachen University)
Kenji Watanabe
(NIMS)
Takashi Taniguchi
(NIMS)
Fabian Hassler
(RWTH Aachen University)
Christian Volk
(RWTH Aachen University)
Christoph Stampfer
(RWTH Aachen University)
Here, we show that the Kane-Mele spin-orbit gap leads to a lifting of the spin-valley degeneracy in bilayer graphene quantum dots [3], resulting in Kramer's doublets with different ordering for electron and hole states preserving particle-hole symmetry. We observe the creation of single electron-hole pairs with opposite quantum numbers and use the electron-hole symmetry to achieve a protected spin-valley blockade in electron-hole double quantum dots. The latter will allow spin-to-charge conversion and valley-to-charge conversion, which is essential for the operation of spin and valley qubits.
[1] F. Haldane, Phys. Rev. Lett. 61, 2015 (1988)
[2] C. L. Kane and E. J. Mele, Phys. Rev. Lett. 95, 226801 (2005)
[3] L. Banszerus et al., Nat. Commun 12, 5250 (2021)
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