"Magnonics with macroscopic quantum states"

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

Abstract:

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.