Quantum dots based on parabolic quantum wells: importance of electronic correlations

Abstract

We present measurements and theoretical interpretation of the magnetic field dependent excitation spectra of a two-electron quantum dot. The quantum dot is based on an Al${}_x$Ga${}_{1-x}$As parabolic quantum well with effective $g^{\star }$-factor close to zero. Results of tunneling spectroscopy of the four lowest states are compared to exact diagonalization calculations and a generalized Heitler--London approximation and good agreement is found. Electronic correlations, associated with the formation of an H${}_2$-type Wigner molecule, turn out to be very important in this system.

References in corpus (2)

• Recipes for spin-based quantum computing
• Symmetry breaking and Wigner molecules in few-electron quantum dots

Cited by in corpus (3)

• Three-electron anisotropic quantum dots in variable magnetic fields: exact results for excitation spectra, spin structures, and entanglement
• Artificial quantum-dot Helium molecules: Electronic spectra, spin structures, and Heisenberg clusters
• Carrier-carrier entanglement and transport resonances in semiconductor quantum dots