Highly-ordered wide bandgap materials for quantized anomalous Hall and magnetoelectric effects

Advances in wide bandgap materials for semiconductor spintronics

Existing semiconductor electronic and photonic devices utilize the charge on electrons and holes in order to perform their specific functionality such as signal processing or light emission. The relatively new field of semiconductor spintronics seeks, in addition, to exploit the spin of charge carriers in new generations of transistors, lasers and integrated magnetic sensors. The ability to con...

Anomalous index of refraction in photonic bandgap materials

Near the gap in a photonic bandgap material the effective index of refraction can become less than unity and in fact can approach zero at the band edge itself-leading to ultra-refractive optical effects . We illustrate this effect quantitatively in a simple one-dimensional Kronig-Penney model of a threedimensional bandgap structure . As a complement to index-enhancing schemes involving lasing w...

Tunneling Anomalous and Spin Hall Effects.

We predict, theoretically, the existence of the anomalous Hall effect when a tunneling current flows through a tunnel junction in which only one of the electrodes is magnetic. The interfacial spin-orbit coupling present in the barrier region induces a spin-dependent momentum filtering in the directions perpendicular to the tunneling current, resulting in a skew tunneling even in the absence of ...

The Quantized Hall Effect

The Quantized Hall Effect

This variation on a classical phenomenon makes it possible, even in an irregular sample, to measure fundamental constants with an accuracy rivaling that of the most precise measurements yet made F ew areas of modern science have effect, a planar sample of conductive been studied as intensively as the physics of semiconducting mate-material is placed in a magnetic field and thus obtain quantitie...