Open AccessExcited-state spectroscopy on a nearly closed quantum dot via charge detection
Author(s) -
J. M. Elzerman,
Ronald Hanson,
L. H. Willems van Beveren,
L. M. K. Vandersypen,
Leo P. Kouwenhoven
Publication year - 2004
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.1757023
Subject(s) - quantum dot , quantum tunnelling , excited state , quantum dot laser , electron , spectroscopy , atomic physics , physics , charge (physics) , condensed matter physics , molecular physics , optoelectronics , semiconductor , quantum mechanics , semiconductor laser theory
We demonstrate a 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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