1995/11/28 by O. Klein, David Goldhaber‐Gordon, D. Goldhaber-Gordon +3 · 1 citation
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat
paper · pdf · doi:10.1103/physrevb.53.r4221
11 pages of text in RevTeX, 4 figures in Postscript (files in the form of uuencoded compressed tar file)
arxiv created 1995/11/28 · openalex publication_date 1996/02/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The temperature dependence of conductance resonances is used to measure the evolution with the magnetic field of the average level spacing \ensuremathΔ\ensuremathε of a droplet containing \ensuremath∼30 electrons created by lateral confinement of a two-dimensional electron gas in GaAs. \ensuremathΔ\ensuremathε becomes very small (30 \ensuremathμeV) near two critical magnetic fields at which the symmetry of the droplet changes, and these decreases of \ensuremathΔ\ensuremathε are predicted by Hartree-Fock (HF) for charge excitations. Between the two critical fields, however, the largest measured \ensuremathΔ\ensuremathε=100 \ensuremathμeV is an order of magnitude smaller than predicted by HF but comparable to the Zeeman splitting at this field, which suggests that excitations of the spin degrees of freedom are important.