Nanowerk July 1, 2020
By connecting electromagnetic waves and magnetism to create a system made of magnon polaritons an international team of researchers (USA- Argonne National Laboratory, UK) has demonstrated the existence of an “exceptional surface”. Through experiments, they have shown that EPs form a three-dimensional exceptional surface (ES) when the system is tuned in a four-dimensional synthetic space. They found that an exceptional saddle point (ESP) exists in the ES which originates from the unique couplings between magnons and microwave photons. It exhibits unique anisotropic behaviors in both the real and imaginary parts of the eigenfrequencies. The findings open new opportunities for high-dimensional control of non-Hermitian systems…read more. TECHNICAL ARTICLE
The middle layer in this image is a 3D “exceptional surface” calculated from quasiparticles called magnon polaritons. The surfaces above and below the intersection with the exceptional surface display unique behaviors. Credit: Image: Argonne National Laboratory