We study the electronic structure of a single self-assembled InAs quantum dotby probing elastic single-electron tunneling through a single pair of weaklycoupled dots. In the region below pinch-off voltage, the non-linear thresholdvoltage behavior provides electronic addition energies exactly as the linear,Coulomb blockade oscillation does. By analyzing it, we identify the s and pshell addition spectrum for up to six electrons in the single InAs dot, i.e.one of the coupled dots. The evolution of shell addition spectrum with magneticfield provides Fock-Darwin spectra of s and p shell.
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