"Magnonics with macroscopic quantum states"

Le 15 novembre 2019
À 15h01
Auditorium de l’IPCMS

Conférence "Magnonics with macroscopic quantum state" de Burkard HILLEBRANDS, Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Germany, organisé par l'ICPMS


In the field of magnonics, wave-based logic devices are constructed and studied based on the utilization of spin waves and their quanta  - magnons. The field is developing rapidly due to its potential to implement innovative ways   of data processing as a CMOS complementary technology. Basic building blocks of magnon ics have already been realized. Examples are linear and nonlinear spin-wave waveguide s  tructures, magnonic logic, as well as magnonic amplifiers such as the magnon transistor and  parametric amplification.  
In this talk, I will give an overview about   the fundamentals and the current trends in magnonics. One topic is the realization of n ew functionalities and devices by using novel concepts borrowed from integrated optic s and combining them with the specific advantages found in magnetic systems. Ex amples are directional couplers and quantum-classical analogy devices, such as a magnonic  Stimulated Raman Adiabatic Passage (STIRAP) device.  
Another important direction is to use  fundamentally new macroscopic quantum   phenomena such as a Bose-Einstein condensate (BEC) at room temperature as a novel approach in the field of information proc essing technology. Very promising is the use of  magnon supercurrents driven by a phase gradient in the magnon BEC. I will demonstrate evidence of the formation of a magnon sup ercurrent along with second magnonic sound, and its spatiotemporal behaviour, which is  revealed by means of time- and wavevector-resolved Brillouin light scattering (BLS) spectr oscopy. I will conclude with an outlook.

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