Images Expose Landau Levels For the First Time
Physicists have directly imaged Landau Levels — the quantum levels that determine electron behavior in a strong magnetic field — for the first time since they were theoretically conceived of by Nobel prize winner Lev Landau in 1930.
Using scanning tunneling spectroscopy — a spatially resolved probe that interacts directly with the electrons — scientists at institutions including the Univ. of Warwick and Tohoku Univ. have revealed the internal ring-like structure of these Landau Levels at the surface of a semiconductor. The experimental challenge in the work was to have sufficient spatial resolution in order to overcome the intrinsic disorder in the material which usually only allows the observation of smeared out “drift” states.
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