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Electron Spin Excited States Spectroscopy in a Quantum Dot Probed by QPC Back-action (1112.2354v1)

Published 11 Dec 2011 in cond-mat.mes-hall

Abstract: The quantum point contact (QPC) back-action has been found to cause non-thermal-equilibrium excitations to the electron spin states in a quantum dot (QD). Here we use back-action as an excitation source to probe the spin excited states spectroscopy for both the odd and even electron numbers under a varying parallel magnetic field. For a single electron, we observed the Zeeman splitting. For two electrons, we observed the splitting of the spin triplet states $|T{+}>$ and $|T{0}>$ and found that back-action drives the singlet state $|S>$ overwhelmingly to $|T{+}>$ other than $|T{0}>$. All these information were revealed through the real-time charge counting statistics.

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