Theory of Tunneling Spectroscopy in a Mn$_{12}$ Single-Electron Transistor by Density-Functional Theory Methods

Details Theory of Tunneling Spectroscopy in a Mn$_{12}$ Single-Electron Transistor by Density-Functional Theory Methods Theory of Tunneling Spectroscopy in a Mn$_{12}$ Single-Electron Transistor by Density-Functional Theory Methods

2008-12-05

arxiv.org/abs/0812.1058v2

Phys. Rev. Lett. 104, 017202 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, a revised version with minor changes

Scientific paper

10.1103/PhysRevLett.104.017202

We consider tunneling transport through a Mn$_{12}$ molecular magnet using spin density functional theory. A tractable methodology for constructing many-body wavefunctions from Kohn-Sham orbitals allows for the determination of spin-dependent matrix elements for use in transport calculations. The tunneling conductance at finite bias is characterized by peaks representing transitions between spin multiplets, separated by an energy on the order of the magnetic anisotropy. The energy splitting of the spin multiplets and the spatial part of their many-body wave functions, describing the orbital degrees of freedom of the excess charge, strongly affect the electronic transport, and can lead to negative differential conductance.

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