A pinboard by
can yesilyurt

Ph.D Student, National University of Singapore


Novel nanoelectronic applications based on spin- and valley-dependent quantum transport.

My research interest is mainly based on condensed matter physics and applications in Dirac and Weyl semimetals. Such spacial materials provide many remarkable electronic features that may pave the way for novel nanoelectronic devices. I am currently working at the forefront of nanoelectronics, i.e., in investigating the transport and device potential of Dirac and Weyl semimetals. The topological nature of such materials have only recently been uncovered, and could potentially herald a new era of robust, energy‐efficient, and high‐ speed electronics. I have also investigated the strain effect to separate valley electrons pertinent to the emerging field of valleytronics in novel two‐dimensional conductors such as graphene and silicene.


Klein tunneling in Weyl semimetals under the influence of magnetic field.

Abstract: Klein tunneling refers to the absence of normal backscattering of electrons even under the case of high potential barriers. At the barrier interface, the perfect matching of electron and hole wavefunctions enables a unit transmission probability for normally incident electrons. It is theoretically and experimentally well understood in two-dimensional relativistic materials such as graphene. Here we investigate the Klein tunneling effect in Weyl semimetals under the influence of magnetic field induced by ferromagnetic stripes placed at barrier boundaries. Our results show that the resonance of Fermi wave vector at specific barrier lengths gives rise to perfect transmission rings, i.e., three-dimensional analogue of the so-called magic transmission angles in two-dimensional Dirac semimetals. Besides, the transmission profile can be shifted by application of magnetic field in the central region, a property which may be utilized in electro-optic applications. When the applied potential is close to the Fermi level, a particular incident vector can be selected by tuning the magnetic field, thus enabling highly selective transmission of electrons in the bulk of Weyl semimetals. Our analytical and numerical calculations obtained by considering Dirac electrons in three regions and using experimentally feasible parameters can pave the way for relativistic tunneling applications in Weyl semimetals.

Pub.: 13 Dec '16, Pinned: 30 Aug '17