Host: Prof.Qingdong Jiang
Venue: TDLI Meeting Room N400
Tencent meeting link: https://meeting.tencent.com/dm/CxnejdtCfL25 Meeting ID: 813200445, no password
Abstract:
Chirality or handedness distinguishes an object from its mirror images, such as the spread thumb, index finger, and middle finger of the right and left hand. In mathematics, it is described by the outer product of three vectors that obey a right-hand vs. left hand rule. In this presentation, I focus on the chirality observed in the excited states of the magnetic order, dielectrics, and conductors that hold transverse spins when they are evanescent [1,2,3]. Even without any relativistic effect, the transverse spin of the evanescent waves is locked to the momentum and the surface normal of their propagation plane. This chirality thereby acts as a generalized spin–orbit interaction, which leads to the discovery of various chiral interactions between magnetic, phononic, electronic, photonic, plasmonic, superconductor, and ferronic excitations in spintronics that mediate the excitation of quasiparticles into a single direction, leading to phenomena such as chiral spin and phonon pumping, chiral spin Seebeck, spin skin, magnonic trap, magnon Doppler, chiral magnon damping, and spin diode effects.
Reference：
[1] T. Yu**, Z. Luo, and G. E. W Bauer, Chirality as generalized spin–orbit interaction in spintronics. Physics Reports 1009, 1-115 (2023).
[2] T. Yu**, J. Zou, B. Zeng, J. W. Rao, and K. Xia, Non-Hermitian topological Magnonics . Physics Reports 1062, 1-86 (2024).
[3] T. Yu**, X.-H. Zhou, G. E. W. Bauer, and I. V. Bobkova, Electromagnetic Proximity Effect: Superconducting Magnonics and Beyond, 1-108, arXiv:2506.18502.
Biography:
Tao Yu has been dedicated to theoretical research in the fields of magnetism, spintronics, orbitronics, unconventional superconductivity, and their interdisciplinary areas. In recent years, a number of theoretical predictions by Yu's research group have been experimentally verified, including the Meissner-magnon collective mode in superconductors, the giant frequency shift of ferromagnetic resonance in ferromagnet Josephson junctions, magnonic thermal transistors, hyperbolic excitation of ferrons in ferroelectric materials, surface acoustic waves driven by magnetic dynamic excitations, magnetically induced unidirectional perfect absorption of microwaves, and the spin Seebeck effect of magnons in altermagnets.