We have observed that, in zero magnetic field, a dc bias across a lateral confined quantum dot (QD) splits each resonant peak in the differential conductance versus the gate voltage measurement into two. The splitting is nearly linear with the applied bias VD. Temperature-dependence study indicates that the corresponding energy separation between the two splitting peaks is close to eVD. A model is proposed that explains this splitting in terms of the bias-induced shifting of energy levels in the QD and the splitting of the Fermi level. Using our model, the bias-induced energy level shift in the QD can be calculated.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)