Room temperature de Haas - van Alphen effect in silicon nanosandwiches

TL;DR

This paper reports the first observation of de Haas-van Alphen and quantum Hall effects at room temperature in silicon nanosandwich structures, revealing new quantum phenomena enabled by impurity-induced edge channels.

Contribution

It demonstrates room temperature de Haas-van Alphen effect in silicon quantum wells, a novel achievement in semiconductor physics.

Findings

Room temperature de Haas-van Alphen effect observed in silicon structures

Quantum Hall effect detected at 77K in silicon quantum wells

Impurity stripes enable effective cooling and quantum phenomena at high temperatures

Abstract

The negative-U impurity stripes confining the edge channels of semiconductor quantum wells are shown to allow the effective cooling inside in the process of the spin-dependent transport. The aforesaid promotes also the creation of composite bosons and fermions by the capture of single magnetic flux quanta on the edge channels under the conditions of low sheet density of carriers, thus opening new opportunities for the registration of the quantum kinetic phenomena in weak magnetic fields at high temperatures up to the room temperature. As a certain version noted above we present the first findings of the high temperature de Haas-van Alphen, 300K, and quantum Hall, 77K, effects in the silicon sandwich structure that represents the ultra-narrow, 2 nm, p-type quantum well (Si-QW) confined by the delta barriers heavily doped with boron on the n-type Si (100) surface. These data appear to result from the low density of single holes that are of small effective mass in the edge channels of p-type Si-QW because of the impurity confinement by the stripes consisting of the negative-U dipole boron centers which seems to give rise to the efficiency reduction of the electron-electron interaction.