Cotunneling Spectroscopy in Few-Electron Quantum Dots

Details Cotunneling Spectroscopy in Few-Electron Quantum Dots Cotunneling Spectroscopy in Few-Electron Quantum Dots

2004-08-12

arxiv.org/abs/cond-mat/0408276v1

Phys. Rev. Lett. 93, 256801 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related papers available at http://marcuslab.harvard.edu

Scientific paper

10.1103/PhysRevLett.93.256801

Few-electron quantum dots are investigated in the regime of strong tunneling to the leads. Inelastic cotunneling is used to measure the two-electron singlet-triplet splitting above and below a magnetic field driven singlet-triplet transition. Evidence for a non-equilibrium two-electron singlet-triplet Kondo effect is presented. Cotunneling allows orbital correlations and parameters characterizing entanglement of the two-electron singlet ground state to be extracted from dc transport.

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