Longitudinal wave function control in single quantum dots with an applied magnetic field

Abstract

Controlling single-particle wave functions in single semiconductor quantum dots is in demand to implement solid-state quantum information processing and spintronics. Normally, particle wave functions can be tuned transversely by an perpendicular magnetic field. We report a longitudinal wave function control in single quantum dots with a magnetic field. For a pure InAs quantum dot with a shape of pyramid or truncated pyramid, the hole wave function always occupies the base because of the less confinement at base, which induces a permanent dipole oriented from base to apex. With applying magnetic field along the base-apex direction, the hole wave function shrinks in the base plane. Because of the linear changing of the confinement for hole wave function from base to apex, the center of effective mass moves up during shrinking process. Due to the uniform confine potential for electrons, the center of effective mass of electrons does not move much, which results in a permanent dipole moment change and an inverted electron-hole alignment along the magnetic field direction. Manipulating the wave function longitudinally not only provides an alternative way to control the charge distribution with magnetic field but also a new method to tune electron-hole interaction in single quantum dots.

19 pages,3 figures

References in corpus (11)

• Ultrafast optical control of entanglement between two quantum dot spins
• Ultrafast optical rotations of electron spins in quantum dots
• Demonstration of quantum entanglement between a single electron spin confined to an InAs quantum dot and a photon
• Imaging and spectroscopy of artificial-atom states in core/shell nanocrystal quantum dots
• Anomalous quantum confined Stark effects in stacked InAs/GaAs self-assembled quantum dots
• Experimental imaging and atomistic modeling of electron and hole quasiparticle wave functions in InAs/GaAs quantum dots
• Full coherent control of nuclear spins in an optically pumped single quantum dot
• Non-linear exciton spin-splitting in single InAs/GaAs self-assembled quantum structures in ultrahigh magnetic fields
• Correlation Effects in Wave Function Mapping of Molecular Beam Epitaxy Grown Quantum Dots
• Absence of correlation between built-in electric dipole moment and quantum Stark effect in InAs/GaAs self-assembled quantum dots
• Charge state control in single InAs/GaAs quantum dots by external electric and magnetic fields

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• Many-Body Effect of Mesoscopic Localized States in MoS${}_2$ Monolayer
• Giant Photocurrent Enhancement by Coulomb Interaction in a Single Quantum Dot for Energy Harvesting
• Tuning the carrier tunneling in a single quantum dot with a magnetic field in Faraday geometry
• Conditions for the occurrence of Coulomb blockade in phosphorene quantum dots at room temperature