Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/38399
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- Title
- Spin-detection in a quantum electromechanical shuttle system
- Related
- New journal of physics, Vol. 8, Issue 5, Article No. 63,
- DOI
- 10.1088/1367-2630/8/5/063
- Publisher
- Institute of Physics Publishing
- Date
- 2006
- FoR/RFCD Code(s)
-
020499 Condensed Matter Physics not elsewhere classified
020602 Field Theory and String Theory
- Author/Creator
- Twamley, J
- Author/Creator
- Utami, D. W
- Author/Creator
- Goan, H.-S
- Author/Creator
- Milburn, G
- Description
- We study the electrical transport of a harmonically bound, single-molecule C₆₀ shuttle operating in the Coulomb blockade regime, i.e. single electron shuttling. In particular, we examine the dependance of the tunnel current on an ultra-small stationary force exerted on the shuttle. As an example, we consider the force exerted on an endohedral N@C₆₀ by the magnetic field gradient generated by a nearby nanomagnet. We derive a Hamiltonian for the full shuttle system which includes the metallic contacts, the spatially dependent tunnel couplings to the shuttle, the electronic and motional degrees of freedom of the shuttle itself and a coupling of the shuttle's motion to a phonon bath. We analyse the resulting quantum master equation and find that, due to the exponential dependence of the tunnel probability on the shuttle-contact separation, the current is highly sensitive to very small forces. In particular, we predict that the spin state of the endohedral electrons of N@C₆₀ in a large magnetic gradient field can be distinguished from the resulting current signals within a few tens of nanoseconds. This effect could prove useful for the detection of the endohedral spin-state of individual paramagnetic molecules such as N@C₆₀ and P@C₆₀, or the detection of very small static forces acting on a C₆₀ shuttle.
- Description
- 27 page(s)
- Subject Keyword
- 020499 Condensed Matter Physics not elsewhere classified
- Subject Keyword
- 020602 Field Theory and String Theory
- Resource Type
- journal article
- Organisation
- Macquarie University. Centre for Quantum Computer Technology
- Organisation
- Macquarie University. Dept. of Physics
- Identifier
- http://hdl.handle.net/1959.14/38399
- Identifier
- ISSN:1367-2630
- Identifier
- mq-rm-2006005450
- Language
- eng
- Rights
- Copyright 2006 IOP Publishing Ltd. Reprinted from New journal of physics. This material is posted here with the permission of IOP Publishing Ltd and the authors. Use of this material is permitted for personal, research and non-commercial uses. Further information regarding the copyright applicable to this article can be viewed at http://www.iop.org/EJ/journal/-page=extra.copyright/NJP.
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