We formulate and approximately solve a specific many body generalization of the Landau-Zener problem. Unlike with the single particle Landau-Zener problem, our system does not abide in the adiabatic ground state, even at very slow driving rates. The structure of the theory suggests that this finding reflects a more general phenomenon in the physics of adiabatically driven many particle systems....

Temperature-independent magnetic viscosity in ferritin has been observed from ∼ 2 K down to 100 mK, proving that quantum tunneling plays the main role in these particles at low temperature. Magnetic relaxation has also been studied using the Landau-Zener method making the system crossing zero resonant field at different rates, α = dH/dt, ranging from 10 −5 to 10 −3 T/s, and at different tempera...

The polarization of conduction electrons due to s-d interaction in CuMn alloys is investigated. The uniform polarization due to the first-order perturbed energy corresponding to the Fröhlich-Nabarro and Zener mechanism is shown to be completely modified by the first order perturbation of the wave functions and the polarization is concentrated in the neighborhood of the Mn ions.12 At the same ti...

Temperature-independent magnetic viscosity in ferritin has been observed from ;2 K down to 100 mK, proving that quantum tunneling plays the main role in these particles at low temperature. Magnetic relaxation has also been studied using the Landau-Zener method, making the system crossing zero resonant field at different rates a5dH/dt ranging from 10 to 10 T/s and at different temperatures from ...

We calculate spin transport in two-dimensional waveguides in the presence of spatiallymodulated Zeeman-split energy bands.We show that in a regimewhere the spin evolution is predominantly adiabatic the spin backscattering rate can be tuned via diabatic Landau-Zener transitions between the spin-split bands [Betthausen et al., Science 337, 324 (2012)]. This mechanism is tolerant against spin-inde...

We study the dynamics of a spin coupled to an oscillating magnetic field, in the presence of decoherence and dissipation. In this context we solve the master equation for the Landau-Zener problem, both in the unitary and in the irreversible case. We show that a single spin can be " magnetized " in the direction parallel to the oscillating bias. When decay from upper to lower level is taken into...

By the insertion of thin InxGa1!xN layers into Nitrogen-polar GaN p-n junctions, polarizationinduced Zener tunnel junctions are studied. The reverse-bias interband Zener tunneling current is found to be weakly temperature dependent, as opposed to the strongly temperature-dependent forward bias current. This indicates tunneling as the primary reverse-bias current transport mechanism. The Indium ...

The carbon nanotube and graphene nanoribbon band structure is derived using the two-band k · p method and shown to have a similar band structure as a III-V semiconductor. Contrary to a previous claim, it is shown that the tunnelling probability is lower for a graphene based semiconductor than for a III-V semiconductor with the same bandgap. Considering the relation between the bandgap and the e...

We study Landau-Zener dynamics in a double quantum dot filled with two electrons, where the spin states can become correlated with charge states and the level velocity can be tuned in a time-dependent fashion. We show that a correct interpretation of experimental data is only possible when finite-time effects are taken into account. In addition, our formalism allows the study of partial adiabat...

We show that superlattices based on zero-gap semiconductors such as graphene and mercury telluride exhibit characteristic Bloch–Zener oscillations that emerge from the coherent superposition of Bloch oscillations and multiple Zener tunneling between the electron and hole branch. We demonstrate this mechanism by means of wave packet dynamics in various spatially periodically modulated nanoribbon...