2008/07/07 by Emmanuel Rousseau, E. Rousseau, D. Ponarin +7 · 53 citations
Physics and Astronomy · #Advanced Chemical Physics Studies #Atomic physics #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Electron #Helium #Mesoscopic physics #Nuclear physics #Physics #Quantum mechanics #Quantum, superfluid, helium dynamics #Spectral line #Superfluid helium-4 #Wigner crystal #cond-mat.mes-hall #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevb.79.045406
published in Physical Review B 79(4) (American Physical Society) · 12 pages, 13 figures, draft paper
arxiv created 2008/07/07 · openalex publication_date 2009/01/12 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present here an experimental study of Wigner islands formed by electrons floating over helium. Electrons are trapped electrostatically in a mesoscopic structure covered with a helium film, behaving as a quantum dot in the near-classical limit. By removing electrons one by one, we are able to find the addition spectrum, i.e., the energy required to add (or extract) one electron from the trap with occupation number N. Experimental addition spectra are compared with Monte Carlo simulations for the actual trap geometry, confirming the ordered state of electrons over helium in the island.