Journal
PHYSICAL REVIEW B
Volume 79, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.045406
Keywords
helium films; mesoscopic systems; Monte Carlo methods; quantum dots; superfluid helium-4; Wigner crystal
Funding
- Fonds National de la Science [ACI 2002-2140]
- European Network [HPRN-CT-000 00157]
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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.
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