Charge, spin and valley pumping in silicene junction
Laboratory of Physics of Magnetism and Photonic Materials, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia
Received: 9 February 2017
Received in final form: 4 July 2017
Published online: 11 September 2017
The feasibility of generating polarized and unpolarized current in silicene by means of quantum pumping is discussed within the framework of Floquet scattering matrix. Charge pumping current is induced at zero magnetization splitting whereas spin and valley pumping current emerge when the symmetry between Dirac points K and K′ is broken. The intensity and direction of pumped current are shown to be dependent on pumping amplitude, phase between barriers, exchange energy and electric field. By careful control of external parameters, it is demonstrated that the ferromagnetic-silicene junction could be operated as a pump device that generates pure spin and valley pumping current.
Key words: Mesoscopic and Nanoscale Systems
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2017