Effect of an inhomogeneous external magnetic field on the electronic coupling of quantum dot molecule

• Published in: Physica. B, Condensed matter Vol. 334; no. 3; pp. 250 - 256
• Main Authors: Ben Salem, E., Jaziri, S., Bennaceur, R.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.2003; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport in multilayers, nanoscale materials and structures; Exact sciences and technology; Exchange energy; Hund–Mulliken technique; Inhomogeneous magnetic field; Level splitting and interactions; Physics; Quantum dots; Qubit; Spin; Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect; Spin-orbit coupling, zeeman, stark, and strain splitting, jahn-teller effect; Switching; Zeeman coupling; Inhomogeneous magnetic field; Exchange energy; Zeeman coupling; Quantum dots; Spin; Qubit; 71.70.Ej; Hund–Mulliken technique; 03.67.Lx; 85.30.−z; Switching; Gallium arsenides; Inorganic compounds; Quantum computing; Zeeman effect; Electron interaction; Hund-Mulliken technique; External fields; 85.30.-z Quantum dots; Magnetic model; Ternary compounds; Uniform field; Magnetic field effects; Theoretical study; Binary compounds; Coulomb interaction; Indium arsenides; Exchange interactions; III-V semiconductors
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/S0921-4526(03)00073-5

The electron spins are a candidate for one or two qubits, which, when located in semiconductor double quantum dots. The desired two-qubit coupling is provided by a combination of the Coulomb interaction and the Pauli exclusion principle. The coupling between the spin can be switched on and off via externally controlled a uniform magnetic field. In the experimental environment of the system an inhomogeneous magnetic field inevitably appears and added to the homogenous applied magnetic field. In this work, we study a two-electron quantum dot molecule in an inhomogeneous magnetic field. We consider theoretically the interplay between Zeeman coupling and exchange induced swap action in spin-based double quantum dot quantum computer.