Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 53: Magnonics II

MA 53.4: Vortrag

Donnerstag, 19. März 2020, 15:45–16:00, HSZ 401

Stabilizing Bose-Einstein condensation of magnons in ultrathin films using spatial confinement — •Morteza Mohseni1, Alireza Qaiumzadeh2, Alexander A. Serga1, Arne Brataas2, Burkard Hillebrands1, and Philipp Pirro11Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway

A high density of interacting quasi particles (QPs) can undergo a phase transition to form a new phase of matter known as the Bose Einstein condensate (BEC). It has been predicted that a magnon BEC cannot be stabilized in extended ultrathin insulating magnets of yttrium iron garnet (YIG) [1]. Here, we introduce a new way to stabilize a magnon BEC in an ultrathin film by spatial confinement. Using numerical simulations, we present the formation of a magnon BEC in an ultrathin YIG microconduit and explore the nonlinear scattering processes behind the BEC formation in our system. We show how quantized thermalization channels allow the BEC formation in our confined element. Moreover, we investigate the role of dipolar interactions on the BEC stability in our system. Our results provide new insight into strongly nonlinear spin dynamics in ultrathin films, and further introduce a nontrivial mechanism to obtain BEC stability in nanoscale devices. 1. I. S. Tupitsyn, et al., Phys. Rev. Lett. 100, 257202 (2008)

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