2017/05/31 by C. J. Wesslén, C J Wesslén, E Lindroth
Chemistry · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Excited state #Ground state #Harmonic oscillator #Magnetic field #Phonon #Quantum and electron transport phenomena #Quantum dot #Relaxation (psychology) #Semiconductor Quantum Structures and Devices #Singlet state #cond-mat.mes-hall
paper · pdf · doi:10.1088/1361-648x/aa8b34
arxiv created 2017/05/31 · openalex created_date 2017/06/05 · openalex publication_date 2017/09/08 · arxiv updated 2017/10/25 · openalex updated_date 2026/08/05
Spin-orbit mediated phonon relaxation in a two-dimensional quantum dot is investigated using different confining potentials. Elliptical harmonic oscillator and cylindrical well results are compared to each other in the case of a two-electron GaAs quantum dot subjected to a tilted magnetic field. The lowest energy set of two-body singlet and triplet states are calculated including spin-orbit and magnetic effects. These are used to calculate the phonon induced transition rate from the excited triplet to the ground state singlet for magnetic fields up to where the states cross. The roll of the cubic Dresselhaus effect, which is found to be much more important than previously assumed, and the positioning of 'spin hot-spots' are discussed and relaxation rates for a few different systems are exhibited.