Cavity Mediated Manipulation of Distant Spin Currents Using a Cavity-Magnon-Polariton

Bai, Lihui; Harder, Michael; Hyde, Paul; Zhang, Zhaohui; Hu, C.‐M.; Chen, Y. P.; Xiao, John Q.

doi:10.1103/physrevlett.118.217201

Cited by 157 publications

(97 citation statements)

References 22 publications

(39 reference statements)

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“…The past few years have seen a steady stream of exciting experiments that studied and utilized such coua) Electronic mail: Yipu.Wang@umanitoba.ca b) Electronic mail: hu@physics.umanitoba.ca plings, which has led to the emergence of cavity magnonics. It is anticipated that this new frontier may have broad impact on quantum information 31,47 , spintronics 20,27 , cavity optomagnonics [32][33][34][35][36] , and quantum magnonics 30,31 . In particular, a versatile magnon-based quantum information processing platform has taken shape with coherently coupled microwave photons, magnons, optical photons, phonons, and superconducting qubits.…”

Section: Introductionmentioning

confidence: 99%

“…Combining spin pumping with microwave cavity technique, experiments have detected spin currents generated by cavity magnon polaritons (CMP), which are hybrid excitations of magnon and cavity photon modes 20,21 . Utilizing the non-local hybrid nature of CMP, coherent magnon-photon coupling becomes a useful method for distant manipulation and switch of spin currents 27 , which is a striking example of potential capabilities of cavity spintronics.…”

Section: Harnessing Dissipative Coupling For Cavity Spintronicsmentioning

confidence: 99%

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Dissipative couplings in cavity magnonics

Wang

2020

Journal of Applied Physics

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109

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Cavity Magnonics is an emerging field that studies the strong coupling between cavity photons and collective spin excitations such as magnons. This rapidly developing field connects some of the most exciting branches of modern physics, such as quantum information and quantum optics, with one of the oldest science on the earth, the magnetism. The past few years have seen a steady stream of exciting experiments that demonstrate novel magnon-based transducers and memories. Most of such cavity magnonic devices rely on coherent coupling that stems from direct dipole-dipole interaction. Recently, a distinct dissipative magnon-photon coupling was discovered. In contrast to coherent coupling that leads to level repulsion between hybridized modes, dissipative coupling results in level attraction. It opens an avenue for engineering and harnessing losses in hybrid systems. This article gives a brief review of this new frontier. Experimental observations of level attraction are reviewed. Different microscopic mechanisms are compared. Based on such experimental and theoretical reviews, we present an outlook for developing open cavity systems by engineering and harnessing dissipative couplings.

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Section: Introductionmentioning

confidence: 99%

Section: Harnessing Dissipative Coupling For Cavity Spintronicsmentioning

confidence: 99%

Dissipative couplings in cavity magnonics

Wang

2020

Journal of Applied Physics

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109

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“…This strong coupling offers a possibility to enable coherent information transfer between drastically different information carriers, and thus may find potential applications in quantum information processing, especially when the system becomes hybrid [10], such as by coupling magnons to a superconducting qubit [11,12], to phonons [13,14], or to both microwave and optical photons [15]. Furthermore, various interesting phenomena have been explored in the system of cavity-magnon polaritons, such as the observation of magnon gradient memory [16], the exceptional point [17,18], manipulation of distant spin currents [19], and bistability [20], to name but a few.…”

Section: Introductionmentioning

confidence: 99%

Entangling two magnon modes via magnetostrictive interaction

Zhu

2019

New J. Phys.

175

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We present a scheme to entangle two magnon modes in a cavity magnomechanical system. The two magnon modes are embodied by collective motions of a large number of spins in two macroscopic ferrimagnets, and couple to a single microwave cavity mode via magnetic dipole interaction. We show that by activating the nonlinear magnetostrictive interaction in one ferrimagnet, realized by driving the magnon mode with a strong red-detuned microwave field, the two magnon modes can be prepared in an entangled state. The entanglement is achieved by exploiting the nonlinear magnonphonon coupling and the linear magnon-cavity coupling, and is in the steady state and robust against temperature. The entangled magnon modes in two massive ferrimagnets represent genuinely macroscopic quantum states, and may find applications in the study of macroscopic quantum mechanics and quantum information processing based on magnonics.

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“…Although the coupling strength between a single spin and a microwave photon is very weak, stronger coupling can be achieved by the use of collective excitations (also called as magnons) in ferrimagnetic materials such as yttrium iron garnet (YIG, Y 3 Fe 5 O 12 ) [4][5][6][7][8][9]. Various interesting phenomena, including the manipulation of spin current [10,11], the magnon quintuplet state [12], the exceptional point [13] and the bistability of cavity magnon polaritons [14] have been demonstrated in strongly coupled magnonphoton systems. In addition to the fundamental uniform mode, coupling between photons and higher order non-uniform modes has also been studied, with coupling strength depending on the overlap between the magnon and caity modes [15,16].…”

Section: Introductionmentioning

confidence: 99%

Level attraction and level repulsion of magnon coupled with a cavity anti-resonance

Rao

Zhao

et al. 2019

New J. Phys.

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We report on coherent and dissipative coupling between a magnon mode and an anti-resonance of transmission in a cylindrical microwave cavity. By effectively suppressing coherent coupling, we observe the hybridized dispersion to change from level repulsion to level attraction. A careful examination reveals distinct differences in the line shape and phase evolution of transmission spectra between these coupling behaviors. For a quantitative understanding of the interactions between the magnon mode and the cavity anti-resonance, we develop a model which precisely describes our experimental observations, particularly, the signature in the line shape and phase of the microwave transmission. Our work sets a foundation for understanding strong coupling between magnon modes and cavity anti-resonances. In addition, it also confirms the ubiquity of level attraction in coupled magnon-photon systems, which may be helpful to develop future magnon-based hybrid quantum systems.

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Cavity Mediated Manipulation of Distant Spin Currents Using a Cavity-Magnon-Polariton

Cited by 157 publications

References 22 publications

Dissipative couplings in cavity magnonics

Dissipative couplings in cavity magnonics

Entangling two magnon modes via magnetostrictive interaction

Level attraction and level repulsion of magnon coupled with a cavity anti-resonance

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