Few-electron molecular states and their transitions in a single InAs quantum dot molecule

Abstract

We study electronic configurations in a single pair of vertically coupled self-assembled InAs quantum dots, holding just a few electrons. By comparing the experimental data of non-linear single-electron transport spectra in a magnetic field with many-body calculations, we identify the spin and orbital configurations to confirm the formation of molecular states by filling both the quantum mechanically coupled symmetric and anti-symmetric states. Filling of the anti-symmetric states is less favored with increasing magnetic field, and this leads to various magnetic field induced transitions in the molecular states.

14 pages, 3 figures, Accepted for publication in Phys. Rev. Lett

References in corpus (7)

• Shell structure and electron-electron interaction in self-assembled InAs quantum dots
• Correlated few-electron states in vertical double-quantum-dot systems
• Dissociation of vertical semiconductor diatomic artificial molecules
• Single-dot spectroscopy via elastic single-electron tunneling through a pair of coupled quantum dots
• Molecular phases in coupled quantum dots
• Singlet-triplet splitting, correlation and entanglement of two electrons in quantum dot molecules
• Molecular states observed in a single pair of strongly coupled self-assembled InAs quantum dots

Cited by in corpus (10)

• Full configuration interaction approach to the few-electron problem in artificial atoms
• Universal set of quantum gates for double-dot spin qubits with fixed interdot coupling
• Correlation Effects in Wave Function Mapping of Molecular Beam Epitaxy Grown Quantum Dots
• Imaging correlated wave functions of few-electron quantum dots: Theory and scanning tunneling spectroscopy experiments
• Electronic structures of (In,Ga)As/GaAs quantum dot molecules made of dots with dissimilar sizes
• Single-particle and collective excitations in quantum wires made up of vertically stacked quantum dots: Zero magnetic field
• Spin-Orbit Coupling and Tunneling Current in a Parabolic Quantum Dot
• Isospin phases of vertically coupled double quantum rings under the influence of perpendicular magnetic fields
• Quantum phases of correlated electrons in artificial molecules under magnetic fields
• Theory of electron spectroscopies in strongly correlated semiconductor quantum dots