Berry-phase blockade in single-molecule magnets.

Berry-phase oscillations of the Kondo effect in single-molecule magnets.

We show that it is possible to topologically induce or quench the Kondo resonance in the conductance of a single-molecule magnet (S>1/2) strongly coupled to metallic leads. This can be achieved by applying a magnetic field perpendicular to the molecule easy axis and works for both full- and half-integer spin cases. The effect is caused by the Berry-phase interference between two quantum tunneli...

Berry phase, topology, and degeneracies in quantum nanomagnets.

A topological theory of the diabolical points (degeneracies) of quantum magnets is presented. Diabolical points are characterized by their diabolicity index, for which topological sum rules are derived. The paradox of the missing diabolical points for Fe8 molecular magnets is clarified. A new method is also developed to provide a simple interpretation, in terms of destructive interferences due ...

ATP Synthesis: The World’s Smallest Wind-Up Toy

ATP synthase contains two rotary motors coupled back-to-back: the protonmotive force-driven motor F0 pushes the ATP-driven motor F1 in reverse, causing it to synthesize ATP. Half of this process has now been reproduced in vitro, using tiny magnets instead of F0 to drive the reverse rotation of a single F1 molecule.

Magneto-transport through single-molecule magnets: Kondo-peaks, zero-bias dips, molecular symmetry and Berry's phase

Phase-space Berry phases in chiral magnets: Dzyaloshinskii-Moriya interaction and the charge of skyrmions

The semiclassical motion of electrons in phase space x = (R,k) is influenced by Berry phases described by a six-component vector potential A = (AR,Ak). In chiral magnets, Dzyaloshinskii-Moriya (DM) interactions induce slowly varying magnetic textures (helices and skyrmion lattices) for which all components of A are important, inducing effectively a curvature in mixed position and momentum space...