TY - JOUR
A1 - Todorov, Tchavdar N.
A1 - Dundas, Daniel
A1 - Paxton, Anthony T.
A1 - Horsfield, Andrew P.
T1 - Nonconservative current-induced forces: A physical interpretation
JF - Beilstein Journal of Nanotechnology
Y1 - 2011///
VL - 2
SP - 727
EP - 733
SN - 2190-4286
M3 - doi:10.3762/bjnano.2.79
N2 - We give a physical interpretation of the recently demonstrated nonconservative nature of interatomic forces in current-carrying nanostructures. We start from the analytical expression for the curl of these forces, and evaluate it for a point defect in a current-carrying system. We obtain a general definition of the capacity of electrical current flow to exert a nonconservative force, and thus do net work around closed paths, by a formal noninvasive test procedure. Second, we show that the gain in atomic kinetic energy over time, generated by nonconservative current-induced forces, is equivalent to the uncompensated stimulated emission of directional phonons. This connection with electronâ€“phonon interactions quantifies explicitly the intuitive notion that nonconservative forces work by angular momentum transfer.
ER -