2000/10/27 by J. A. Folk, Joshua Folk, C. M. Marcus +5 · 2 citations
Physics and Astronomy · #Condensed matter physics #Coulomb #Coulomb blockade #Electron #Ground state #Magnetic field #Magnetic moment #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum chaos and dynamical systems #Quantum dot #Quantum mechanics #Spin (aerodynamics) #Spin polarization #Spin quantum number #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1238/physica.topical.090a00026
To appear in Proceedings of the Nobel Symposium 2000 (Physica Scripta)
arxiv created 2000/10/27 · openalex publication_date 2001/01/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate experimentally and theoretically the behavior of Coulomb blockade (CB) peaks in a magnetic field that couples principally to the ground-state spin (rather than the orbital moment) of a chaotic quantum dot. In the first part, we discuss numerically observed features in the magnetic field dependence of CB peak and spacings that unambiguously identify changes in spin S of each ground state for successive numbers of electrons on the dot, N . We next evaluate the probability that the ground state of the dot has a particular spin S , as a function of the exchange strength, J , and external magnetic field strength, B . In the second part, we describe recent experiments on gate-defined GaAs quantum dots in which Coulomb peak motion and spacing are measured as a function of in-plane magnetic field, allowing changes in spin between N and N + 1 electron ground states to be inferred.