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A strain-engineered graphene qubit in a nanobubble

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Title
A strain-engineered graphene qubit in a nanobubble
Author(s)
Hee Chul Park; JungYun Han; Myoung, N.
Publication Date
2023-04
Journal
Quantum Science and Technology, v.8, no.2
Publisher
Institute of Physics
Abstract
We propose a controllable qubit in a graphene nanobubble (NB) with emergent two-level systems (TLSs) induced by pseudo-magnetic fields (PMFs). We found that double quantum dots can be created by the strain-induced PMFs of a NB, and also that their quantum states can be manipulated by either local gate potentials or the PMFs. Graphene qubits clearly exhibit avoided crossing behavior as electrical detuning, with energy splittings of about few meV. We show a remarkable tunability of our device design that allows a fine control of the Landau-Zener transition probability by strain engineering of the NB, showing half-and-half splitting at the avoided crossing point. Further, we demonstrate that the TLSs in the NB exhibit Rabi oscillations near the avoided crossing point, resulting in very fast Rabi cycles of a few ps.
URI
https://pr.ibs.re.kr/handle/8788114/14422
DOI
10.1088/2058-9565/acba40
ISSN
2058-9565
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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