Double Quantum Dots in Carbon Nanotubes

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Double Quantum Dots in Carbon Nanotubes

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Title: Double Quantum Dots in Carbon Nanotubes
Author: von Stecher, Javier; Wunsch, Bernhard; Lukin, Mikhail D.; Demler, Eugene A.; Rey, Ana Maria

Note: Order does not necessarily reflect citation order of authors.

Citation: von Stecher, Javier, Bernhard Wunsch, Mikhail D. Lukin, Eugene A. Demler, and Ana Maria Rey. 2010. Double quantum dots in carbon nanotubes. Physical Review B 82(12): 125437.
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Abstract: We study the two-electron eigenspectrum of a carbon-nanotube double quantum dot with spin-orbit coupling. Exact calculations are combined with a simple model to provide an intuitive and accurate description of single-particle and interaction effects. For symmetric dots and weak magnetic fields, the two-electron ground state is antisymmetric in the spin-valley degree of freedom and is not a pure spin-singlet state. When double occupation of one dot is favored by increasing the detuning between the dots, the Coulomb interaction causes strong correlation effects realized by higher orbital-level mixing. Changes in the double-dot configuration affect the relative strength of the electron-electron interactions and can lead to different ground-state transitions. In particular, they can favor a ferromagnetic ground state both in spin and valley degrees of freedom. The strong suppression of the energy gap can cause the disappearance of the Pauli blockade in transport experiments and thereby can also limit the stability of spin qubits in quantum information proposals. Our analysis is generalized to an array of coupled dots which is expected to exhibit rich many-body behavior.
Published Version: doi:10.1103/PhysRevB.82.125437
Other Sources: http://cmt.harvard.edu/demler/PUBLICATIONS/ref136.pdf
http://arxiv.org/abs/1006.0209
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:8951176

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  • FAS Scholarly Articles [6929]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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