Weyl orbits without an external magnetic field

Spin echo without an external permanent magnetic field

We suggest a sequence of instantaneous spin rotations, that reverses the time evolution of a spin subject to an arbitrary built-in magnetic field. The sequence does not require the knowledge of the direction or strength of the built-in field, and is applicable as long as that field is constant in time. The advantage of the suggested sequence compared to the known spin-echo sequences is that it ...

Magnetic Hysteresis under an Applied Continuous External Magnetic Field

Electromagnetic systems such as AC machines have to support supply voltages containing a DC component which induces both an increase of the total magnetic losses and the premature saturation of the magnetic core. In the present paper, we present an approach for predicting the hysteresis loop of a magnetic material such as non oriented FeSi 3% which is subjected to a DC bias. The measurements ar...

Photon decay γ → νν̄ in an external magnetic field

A Holographic Superconductor in an External Magnetic Field

We study a system of a complex charged scalar coupled to a Reissner–Nordström black hole in 3+1 dimensional anti–de Sitter spacetime, neglecting back–reaction. With suitable boundary conditions, the cases of a neutral and purely electric black hole have been studied in various limits and were shown to yield key elements of superconductivity in the dual 2+1 dimensional field theory, forming a co...

Possible cardiac driving by an external rotating magnetic field.