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We investigate the control of 0-Π transition in Josephson junctions consisting of a highly spin-polarized ferromagnet coupled to two iron pnictide superconductors (SCs). It is shown that, a 0-Π transition as a function of interband coupling strength is always exhibited, which can be experimentally used to discriminate the s± -wave pairing symmetry in the iron pnictide SCs from the s++ -wave one in MgB2. By tuning the doping level in the s± -wave SCs, one can vary the interband coupling strength so as to obtain the controllable 0-Π transition. This device may be realized with current technologies and has practical use in Cooper pair spintronics and quantum information. [ABSTRACT FROM AUTHOR]

Recently discovered new structures and zero-resistance states outside the well-known oscillations are demonstrated to arise from multiphoton assisted processes, by a detailed analysis of microwave photoresistance in two-dimensional electron systems under enhanced radiation. The concomitant resistance dropping and the peak narrowing observed in the experiments are also reproduced. We show that the radiation-induced suppression of average resistance comes from virtual photon effect and exists throughout the whole magnetic field range. [ABSTRACT FROM AUTHOR]

It is shown that a finite spin-Hall current can be induced by applying an in-plane magnetic field in a diffusive two-dimensional electron system with the Rashba and Dresselhaus spin-orbit couplings subjected to a dc electric field. The spin-Hall conductivity depends not only on the strength and direction of the magnetic field, but also strongly depends on the form of the scattering potential. It can be negative or positive in the case of remote impurity scattering, but essentially positive in the case of short-range scattering. [ABSTRACT FROM AUTHOR]