Halide perovskites display full solid solubility for Br: I and Cl: Br compositions at equilibrium,
yet initially homogeneous distributions often partition into Br-and I-rich (Cl-and Br-) regions …

In an idealized infinite crystal, the material properties are constrained by the symmetries of
the unit cell. The point-group symmetry is broken by the sample shape of any finite crystal …

The complex band structure, large spin-orbit induced band splitting, and heavy effective
mass of two-dimensional (2D) hole systems hosted in GaAs quantum wells render them rich …

There has been a surge of recent interest in the role of anisotropy in interaction-induced
phenomena in two-dimensional (2D) charged carrier systems. A fundamental question is …

Composite fermions (CFs), exotic particles formed by pairing an even number of flux quanta
to each electron, provide a fascinating description of phenomena exhibited by interacting …

In the absence of rotational symmetry, a fractional quantum Hall (FQH) system can exploit a
geometric degree of freedom to minimize its ground-state energy. The mass anisotropy of …

A two-dimensional system with extra degrees of freedom, such as spin and valley, is of great
interest in the study of quantum phase transitions. The critical condition when a transition …

All electrons are identical and subject to the same forces, yet the materials they make up
possess a dazzling diversity of physical properties. The interplay of electron-electron …

A fundamental question in the physics of interacting twodimensional (2D) electron systems
is the role of anisotropy. The IRG-1 study measured the Fermi contours of 2D holes, and …