Signatures for Wigner Crystal Formation in the Chemical Potential of a Two-Dimensional Electron System

Ding Zhang, Xuting Huang, Werner Dietsche, Klaus von Klitzing, and Jurgen H. Smet

Phys. Rev. Lett. 113, 076804 – Published 14 August 2014; Erratum Phys. Rev. Lett. 116, 189902 (2016)

Abstract

We investigate the evolution of the chemical potential of a two-dimensional electron system (2DES) as a function of density at a fixed magnetic field. By using a bilayer system, changes in the chemical potential of one 2DES are determined from the density variation induced in the second, nearby 2DES. At high magnetic fields around a filling factor of $ν = 1$ or $ν = 2$ , the chemical potential jump associated with the condensation in a quantum Hall state exhibits two anomalies symmetrically located around these integer filling factors. They are attributed to the formation of a 2D Wigner crystal of quasiparticles.