title: Electrical control of the exciton fine structure of a quantum dot molecule.
abstract: We electrically control the coherent mixing of the optically bright spin states of excitons confined in InAs/GaAs quantum dot molecules. By tunnel coupling two quantum dots, using a vertical electric field, the exciton fine structure splitting and eigenstate orientation relative to the crystal lattice are tuned. We model the electric field dependent anisotropic electron-hole exchange interaction accurately and propose that the controllable mixing of the spin states will enable electrically controlled quantum operations on exciton spin qubits.
authors: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Science Park, Milton Road, Cambridge CB4 0GZ, United Kingdom. niklas.skold@crl.toshiba.co.uk
authors: N
authors: N
authors: Sköld
authors: A
authors: A
authors: Boyer de la Giroday
authors: A J
authors: AJ
authors: Bennett
authors: I
authors: I
authors: Farrer
authors: D A
authors: DA
authors: Ritchie
authors: A J
authors: AJ
authors: Shields