Spin Exciton in quantum dot with spin orbit coupling in high magnetic field

Abstract

Coulomb interactions of few ($N$) electrons confined in a disk shaped quantum dot, with a large magnetic field $B=B^{\ast }$ applied in the z-direction (orthogonal to the dot), produce a fully spin polarized ground state. We numerically study the splitting of the levels corresponding to the multiplet of total spin $S=N/2$ (each labeled by a different total angular momentum $J_z$) in presence of an electric field parallel to $B$, coupled to $S$ by a Rashba term. We find that the first excited state is a spin exciton with a reversed spin at the origin. This is reminiscent of the Quantum Hall Ferromagnet at filling one which has the skyrmion-like state as its first excited state. The spin exciton level can be tuned with the electric field and infrared radiation can provide energy and angular momentum to excite it.

9 pages, 9 figures. submitted to Phys.Rev.B

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Cited by in corpus (10)

• Energy levels and magneto-optical transitions in parabolic quantum dots with spin-orbit coupling
• Spin-orbit coupling and anisotropic exchange in two-electron double quantum dots
• Quantum interference of electrons in a ring: tuning of the geometrical phase
• Effect of electron-electron interaction on the phonon-mediated spin relaxation in quantum dots
• Spin-orbit coupling in a Quantum Dot at high magnetic field
• Rashba-control for the spin excitation of a fully spin polarized vertical quantum dot
• Spin-orbit Interaction induced Singlet-Triplet Resonant Raman Transitions in Quantum-dot Helium
• Linear Kondo conductance in a quantum dot
• Suppression of Kondo-assisted co-tunneling in a spin-1 quantum dot with Spin-Orbit interaction
• Far Infrared absorption of non center of mass modes and optical sum rule in a few electron quantum dot with Rashba spin-orbit coupling