Abstract
Electron states in two vertically coupled quantum dots are analysed using an exact-diagonalization method. In the two-electron system, the ground state at zero field is a spin-singlet state, and this state is eventually replaced by spin-triplet states by applying a vertical magnetic field. One of the triplet states is stable under the conditions of very weak coupling and larger asymmetry between the two dots. In the transition from the three- to the four-electron state, we find a parameter region where the tunnelling current is strongly suppressed because of the orthogonality of the quantum states. An isospin selection rule is effective under strong-coupling conditions.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.