Transport Spectroscopy of a Quantum Dot in a Silicon-on-Insulator (SOI) MOSFET
- We report transport spectroscopy in a gate-induced quantum dot (QD) based on a silicon-on-insulator (SOI) metal-oxide-semiconductor field-effect-transistor (MOSFET). The differential conductance $G$ measurement in the large voltage region shows small conductance peaks, which reveal single-electron tunnelling through exited quantum states of the QD. The discrete energy levels extracted from the differential conductance characteristics agree well with those estimated from a harmonic oscillator approximation. The separation between energy levels is confirmed by using a potential shape extracted from a 3-dimensional device simulation.
- Keywords: Single-electron transistor, Transport spectroscopy, Energy level, Harmonic oscillator