Observation of exceptional points in magnonic parity-time symmetry devices
作者： Haoliang Liu , Dali Sun , Chuang Zhang , Matthew Groesbeck , Ryan Mclaughlin
关键词:
摘要: Non-Hermitian Hamiltonians may still have real eigenvalues, provided that a combined parity-time (ƤƮ) symmetry exists. The prospect of ƤƮ has been explored in several physical systems such as photonics, acoustics, and electronics. eigenvalues these undergo transition from to complex at exceptional points (EPs), where the is broken. Here, we demonstrate existence EP magnonic devices composed two coupled magnets with different magnon losses. eigenfrequencies damping rates change crossing anti-crossing when coupling strength increases. dispersion includes strong "acoustic-like" mode weak "optic-like" mode. Moreover, upon microwave radiation, act resonant cavity unique response compared conventional systems.
sciencemag.org参考文章(42)
Xin-You Lü, Hui Jing, Jin-Yong Ma, Ying Wu, PT-Symmetry-Breaking Chaos in Optomechanics. Physical Review Letters. ,vol. 114, pp. 253601- ,(2015) , 10.1103/PHYSREVLETT.114.253601
J. Rubinstein, P. Sternberg, Q. Ma, Bifurcation diagram and pattern formation of phase slip centers in superconducting wires driven with electric currents. Physical Review Letters. ,vol. 99, pp. 167003- ,(2007) , 10.1103/PHYSREVLETT.99.167003
Bo Peng, Şahin Kaya Özdemir, Fuchuan Lei, Faraz Monifi, Mariagiovanna Gianfreda, Gui Lu Long, Shanhui Fan, Franco Nori, Carl M Bender, Lan Yang, None, Parity–time-symmetric whispering-gallery microcavities Nature Physics. ,vol. 10, pp. 394- 398 ,(2014) , 10.1038/NPHYS2927
Arabinda Haldar, Chandrima Banerjee, Pinaki Laha, Anjan Barman, Brillouin light scattering study of spin waves in NiFe/Co exchange spring bilayer films Journal of Applied Physics. ,vol. 115, pp. 133901- ,(2014) , 10.1063/1.4870053
R. J. Hicken, C. Daboo, M. Gester, A. J. R. Ives, S. J. Gray, J. A. C. Bland, Interlayer exchange coupling in epitaxial Fe/Cr/Fe/Ag/GaAs(100) structures Journal of Applied Physics. ,vol. 78, pp. 6670- 6678 ,(1995) , 10.1063/1.360488
Liang Feng, Ye-Long Xu, William S Fegadolli, Ming-Hui Lu, José EB Oliveira, Vilson R Almeida, Yan-Feng Chen, Axel Scherer, None, Experimental demonstration of a unidirectional reflectionless parity-time metamaterial at optical frequencies Nature Materials. ,vol. 12, pp. 108- 113 ,(2013) , 10.1038/NMAT3495
Zin Lin, Hamidreza Ramezani, Toni Eichelkraut, Tsampikos Kottos, Hui Cao, Demetrios N. Christodoulides, Unidirectional invisibility induced by PT-symmetric periodic structures. Physical Review Letters. ,vol. 106, pp. 213901- ,(2011) , 10.1103/PHYSREVLETT.106.213901
Carl M Bender, Making sense of non-Hermitian Hamiltonians Reports on Progress in Physics. ,vol. 70, pp. 947- 1018 ,(2007) , 10.1088/0034-4885/70/6/R03
Ö. O. Soykal, M. E. Flatté, Strong Field Interactions between a Nanomagnet and a Photonic Cavity Physical Review Letters. ,vol. 104, pp. 077202- 077202 ,(2010) , 10.1103/PHYSREVLETT.104.077202
K. Ando, S. Takahashi, J. Ieda, Y. Kajiwara, H. Nakayama, T. Yoshino, K. Harii, Y. Fujikawa, M. Matsuo, S. Maekawa, E. Saitoh, Inverse spin-Hall effect induced by spin pumping in metallic system Journal of Applied Physics. ,vol. 109, pp. 103913- ,(2011) , 10.1063/1.3587173