Accessing nanotube bands via crossed electric and magnetic fields

摘要

We investigate the properties of conduction electrons in single-walledarmchair carbon nanotubes in the presence of mutually orthogonal electric andmagnetic fields transverse to the tube's axis. We find that the fields giverise to an asymmetric dispersion in the right- and left-moving electrons alongthe tube as well as a band-dependent interaction. We predict that such ananotube system would exhibit spin-band-charge separation and a band-dependanttunneling density of states. We show that in the quantum dot limit, the fieldsserve to completely tune the quantum states of electrons added to the nanotube.For each of the predicted effects, we provide examples and estimates that arerelevant to experiment.