Magnetocohesion of nanowires

The cohesive force and electronic conductance in nanowires modeled by soft- and hard-wall confining potentials, under the influence of a magnetic fiel d (magnetocohesion) and in the linear and nonlinear (finite applied voltage ) regimes, are studied. The appearance of force oscillations as a function of the magnetic field and their correlation with the corresponding characte ristics of the electronic conductance are demonstrated. For materials with a strong Fermi-surface anisotropy (e.g., bismuth), it is predicted that whe n the crystallographic axis associated with the largest diagonal element of the effective-mass tensor is aligned along the direction of the wire, the cohesive force increases dramatically (by an order of magnitude) compared t o the case when that axis is perpendicular to the wire direction.