We establish theoretically that in nonmagnetic semiconducting bilayer or multilayer thin film systems rolled up into compact quasi-one-dimensional nanoarchitectures, the ballistic magnetoresistance is very anisotropic: conductances depend strongly on the direction of an externally applied magnetic field. This phenomenon originates from the curved open geometry of rolled-up nanotubes, which leads to a tunability of the number of quasi-one-dimensional magnetic subbands crossing the Fermi energy. The experimental significance of this phenomenon is illustrated by a sizable anisotropy that scales with the inverse of the winding number, and persists up to a critical temperature that can be strongly enhanced by increasing the strength of the external magnetic field or the characteristic radius of curvature, and can reach room temperature.
@article{arxiv.1408.1775,
title = {Strongly anisotropic ballistic magnetoresistance in compact three-dimensional semiconducting nanoarchitectures},
author = {Ching-Hao Chang and Jeroen van den Brink and Carmine Ortix},
journal= {arXiv preprint arXiv:1408.1775},
year = {2014}
}