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Full-Text Articles in Physical Sciences and Mathematics
Magnetic Skyrmions Unwrapped, Alexey Kovalev
Magnetic Skyrmions Unwrapped, Alexey Kovalev
Alexey Kovalev Papers
Experiments with chiral magnets may hold the key to a better understanding of fundamental aspects of transformations between different skyrmionic states, necessary for magnetic memory and logic applications to become a reality.
With the aim of developing computing devices that operate with low power dissipation, scientists have been pursuing the idea of encoding information in magnetic states. Specifically, skyrmions, which can be thought of as whirl-like states of magnetic moments, are promising candidates for this purpose. The advantage of skyrmions lies in their topological protection, a property implying that only a ‘global’ system modification can erase a skyrmion. Realizations of …
Majorana Bound States With Chiral Magnetic Textures, Utkan Güngördü, Alexey Kovalev
Majorana Bound States With Chiral Magnetic Textures, Utkan Güngördü, Alexey Kovalev
Alexey Kovalev Papers
The aim of this Tutorial is to give a pedagogical introduction into realizations of Majorana fermions, usually termed as Majorana bound states (MBSs), in condensed matter systems with magnetic textures. We begin by considering the Kitaev chain model of “spinless” fermions and show how two “half” fermions can appear at chain ends due to interactions. By considering this model and its two-dimensional generalization, we emphasize intricate relation between topological superconductivity and possible realizations of MBS. We further discuss how “spinless” fermions can be realized in more physical systems, e.g., by employing the spin-momentum locking. Next, we demonstrate how magnetic textures …
Superfluid Spin Transistor, Edward Schwartz, Bo Li, Alexey Kovalev
Superfluid Spin Transistor, Edward Schwartz, Bo Li, Alexey Kovalev
Alexey Kovalev Papers
We propose to use the Hall response of topological defects, such as merons and antimerons, to spin currents in two-dimensional magnetic insulator with in-plane anisotropy for identification of the Berezinskii-Kosterlitz-Thouless (BKT) transition in a transistorlike geometry. Our numerical results relying on a combination of Monte Carlo and spin dynamics simulations show transition from spin superfluidity to conventional spin transport, accompanied by the universal jump of the spin stiffness and exponential growth of the transverse vorticity current. We propose a superfluid spin transistor in which the spin and vorticity currents are modulated by changes in density of free topological defects, e.g., …