arXiv subjects

J. Łuczka

Publications and source records attributed to J. Łuczka.

22 records · Page 2Linked to original sources

arXiv2013

Geometric phase of neutrino propagating through dissipative matter

We study the geometric phase (GP) in neutrino oscillation for both Dirac and Majorana neutrinos. We apply the kinematic generalization of the GP to quantum open systems that take into account the coupling to a dissipative environment. In the dissipationless case, the GP does not depend on the Majorana angle. It is not the case in the presence of dissipation and hence the GP can serve as a tool determining the type of the Dirac vs the Majorana neutrino.

hep-ph↗

arXiv2013

Interference phenomenon and geometric phase for Dirac neutrino in pion+ decay

We analyze the geometric phase in the neutrino oscillation phenomenon, which follows the pion decay π+ --> μ+ + ν_μ. Its value πis consistent with the present-day global analysis of the Standard Model neutrino oscillation parameters, accounting for the nonzero value of θ_13. The impact of the charge-parity (CP) violating phase δ, the neutrino's nature, and the new physics is discussed.

hep-ph↗

arXiv2009

Hubbard ring: currents induced by change of magnetic flux

We investigate currents in a quantum ring threaded by a magnetic flux which can be varied in an arbitrary way from an initial value $ϕ_i$ at time $t_i$ to a final value $ϕ_f$ at time $t_f$. Dynamics of electrons in the ring is described by the Hubbard and the extended Hubbard models. We demonstrate that time dependence of the induced current bears information on electron correlations. In the case of the Hubbard model with infinite on--site repulsion we prove that the current for $t>t_f$ is independent of the flux variation before $t_f$. Additionally, this current is fully determined by a solution of the initial equilibrium problem and the value of $ϕ_f$. Apart from mesoscopic rings our results pose important implications for designing of quantum motors built out as the ring--shaped optical lattice.

cond-mat.mes-hall↗

arXiv2007

Magnetic flux in mesoscopic rings: capacitance, inertia and kinetics

We consider mesoscopic non-superconducting rings with an effective capacitance. We propose a Hamiltonian model describing magnetic flux in such rings. Next we incorporate dissipation and thermal fluctuations into our kinetic model. We consider kinetics in limiting regimes of strong and weak coupling to thermal bath.

cond-mat.mes-hall↗