Excited-state spectroscopy on a nearly-closed quantum dot via charge detection

Details Excited-state spectroscopy on a nearly-closed quantum dot via charge detection Excited-state spectroscopy on a nearly-closed quantum dot via charge detection

2003-12-09

arxiv.org/abs/cond-mat/0312222v1

Applied Physics Letters 84, 4617-4619 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1063/1.1757023

We demonstrate a novel method for measuring the discrete energy spectrum of a quantum dot connected very weakly to a single lead. A train of voltage pulses applied to a metal gate induces tunneling of electrons between the quantum dot and a reservoir. The effective tunnel rate depends on the number and nature of the energy levels in the dot made accessible by the pulse. Measurement of the charge dynamics thus reveals the energy spectrum of the dot, as demonstrated for a dot in the few-electron regime.

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