When the Coulomb repulsion between electrons dominates over their kinetic energy,
electrons in two-dimensional systems are predicted to spontaneously break continuous …

This review visits recent experimental efforts on high mobility two-dimensional electron
systems (2DES) hosted at the Mg x Zn $ _ {{\rm 1}-x} $ O/ZnO heterointerface. We begin with …

The quantum crystal of electrons, predicted more than 80 years ago by Eugene Wigner,
remains one of the most elusive states of matter. In this study, we observed the one …

Wigner predicted that when the Coulomb interactions between electrons become much
stronger than their kinetic energy, electrons crystallize into a closely packed lattice. A variety …

The interplay between the Fermi sea anisotropy, electron-electron interaction, and
localization phenomena can give rise to exotic many-body phases. An exciting example is …

What are the ground states of an interacting, low-density electron system? In the absence of
disorder, it has long been expected that as the electron density is lowered, the exchange …

We investigate the influence of nuclear spins on the resistance of helical edge states of two-
dimensional topological insulators (2DTIs). Via the hyperfine interaction, nuclear spins allow …

Photoemission and tunnelling spectroscopies measure the energies at which single
electrons can be added to or removed from an electronic system. Features observed in such …

The Wigner crystal, an ordered array of electrons, is one of the very first proposed many-
body phases stabilized by the electron-electron interaction. We examine this quantum phase …

A sufficiently large perpendicular magnetic field quenches the kinetic (Fermi) energy of an
interacting two-dimensional (2D) system of fermions, making them susceptible to the …