Ultralong spin decoherence times in graphene quantum dots with a small number of nuclear spins

Fuchs, Moritz and Schliemann, John and Trauzettel, Bjoern (2013) Ultralong spin decoherence times in graphene quantum dots with a small number of nuclear spins. PHYSICAL REVIEW B, 88 (24): 245441. ISSN 2469-9950, 2469-9969

Full text not available from this repository.

Abstract

We study the dynamics of an electron spin in a graphene quantum dot, which is interacting with a bath of less than ten nuclear spins via the anisotropic hyperfine interaction. Due to substantial progress in the fabrication of graphene quantum dots, the consideration of such a small number of nuclear spins is experimentally relevant. This choice allows us to use exact diagonalization to calculate the long-time average of the electron spin as well as its decoherence time. We investigate the dependence of spin observables on the initial states of nuclear spins and on the position of nuclear spins in the quantum dot. Moreover, we analyze the effects of the anisotropy of the hyperfine interaction for different orientations of the spin quantization axis with respect to the graphene plane. Interestingly, we then predict remarkable long decoherence times of more than 10 ms in the limit of few nuclear spins.

Item Type: Article
Uncontrolled Keywords: BILAYER GRAPHENE; CARBON NANOTUBES; ELECTRON SPINS; DIAMOND; ENTANGLEMENT; QUBITS; NANOSTRUCTURES; POLARIZATION; CONFINEMENT; RESONANCE;
Subjects: 500 Science > 530 Physics
Divisions: Physics > Institute of Theroretical Physics
Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group John Schliemann
Depositing User: Dr. Gernot Deinzer
Date Deposited: 23 Mar 2020 06:37
Last Modified: 23 Mar 2020 06:37
URI: https://pred.uni-regensburg.de/id/eprint/15507

Actions (login required)

View Item View Item