Spin filling of a quantum dot derived from excited-state spectroscopy

Abstract

We study the spin filling of a semiconductor quantum dot using excited-state spectroscopy in a strong magnetic field. The field is oriented in the plane of the two-dimensional electron gas in which the dot is electrostatically defined. By combining the observation of Zeeman splitting with our knowledge of the absolute number of electrons, we are able to determine the ground state spin configuration for one to five electrons occupying the dot. For four electrons, we find a ground state spin configuration with total spin S=1, in agreement with Hund's first rule. The electron g-factor is observed to be independent of magnetic field and electron number.

arXiv comment11 pages, 7 figures, submitted to New Journal of Physics, focus issue on Solid State Quantum Information

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• Thermoelectric properties of an interacting quantum dot-based heat engine
• A 2x2 quantum dot array with controllable inter-dot tunnel couplings
• Resonant tunnelling features in the transport spectroscopy of quantum dots
• Measuring the degeneracy of discrete energy levels using a GaAs/AlGaAs quantum dot
• Single-electron Spin Resonance in a Quadruple Quantum Dot
• Ab Initio Exact Diagonalization Simulation of the Nagaoka Transition in Quantum Dots
• Holonomic quantum computing in symmetry-protected ground states of spin chains
• Excited-state spectroscopy on a quantum dot side-coupled to a quantum wire
• Non-equilibrium triplet blockade in parallel coupled quantum dots
• Indirect control of spin precession by electric field via spin-orbit coupling
• Spin precession caused by spin-spin interaction between bounded electrons in quantum dots