The Resonant Tunneling States in a Quantum Point Contact

The resonant tunneling states formed in a relatively long and narrow quantum point contact have been observed. The conductance measurement as a function of bias and gate voltage shows the coulomb diamond structure, which is a typical fingerprint of a quantum dot. From the excited-state spectrum, the average energy-level spacing between the quantized energy states was found to be around 1 meV. Also, the shape of the resonant tunneling peak matched that of a quantum dot. The results support the evidence that a quantum dot can be formed in a relatively narrow quantum point contact. KCI Citation Count: 3