Microscopic origin of level attraction for a coupled magnon-photon system in a microwave cavity

Proskurin, Igor; Macêdo, Rair; Stamps, R. L.

doi:10.1088/1367-2630/ab3cb7

Cited by 30 publications

(19 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can also be obtained using classical electrodynamics at a phenomenological level by a macroscopic description of input-output behavior as given in Refs. [23,25,26].…”

Section: B Basic Theoretical Descriptionmentioning

confidence: 99%

“…Dissipation can give rise to non-Hermitian quantum dynamics leading to physical phenomena such as super-and subradiance [12][13][14], non-Hermitian skin effect [15][16][17], topological non-Hermitian phases [17,18], and critical behavior beyond the standard paradigms [19][20][21]. Particularly, through dissipation engineering, the nature of the coupling between energy levels can be dramatically modified, even demonstrating level attraction when the frequencies of the two coupled modes match [22][23][24][25]. Such attraction opens perspectives for topological energy transfer, quantum sensing, and synchronization in hybrid systems [22][23][24]26].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The microscopic origin of magnon-photon level attraction by traveling waves: Theory and experiment

Yao

Zhang

et al. 2019

Phys. Rev. B

View full text Add to dashboard Cite

The dissipative light-matter coupling can cause the attraction of two energy levels, i.e., level attraction, when competing with the coherent coupling that induces usual Rabi-level splitting. The level attraction shows attractive potential for topological information processing. However, the underlying microscopic quantum mechanism of dissipative coupling still remains unclear although the behavior has been understood to root in the non-Hermitian physics, which brings difficulties in quantifying and manipulating the competition between coherence and dissipation and thereby the flexible control of level attraction. Here, by coupling a magnon mode to a cavity supporting both standing and traveling waves, we identify the traveling-wave state to be responsible for magnonphoton dissipative coupling. By characterizing the radiative broadening of a magnon linewidth, we quantify the coherent and dissipative coupling strengths and their competition. The effective magnon-photon coupling strength, as a net result of competition, is analytically presented using quantum theory to show good agreement with measurements. In this manner, we extend the control dimension of level attraction by tuning field torque on magnetization or global cavity geometry. Our findings provide insights on engineered coupled harmonic oscillator systems.

show abstract

“…It can also be obtained using classical electrodynamics at a phenomenological level by a macroscopic description of input-output behavior as given in Refs. [23,25,26].…”

Section: B Basic Theoretical Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The microscopic origin of magnon-photon level attraction by traveling waves: Theory and experiment

Yao

Zhang

et al. 2019

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…1(b) and 1(d), which is in strong contrast to the level repulsion induced by coherent coupling. It should be noted that apart from the cause of the dissipative coupling, the LA effect itself is a ubiquitous phenomenon that can also be induced by many other mechanisms, such as two-tone driving [61][62][63] , parametric driving 64,65 , and coupled systems involving inverted oscillators 66 . However, as we will explain in this article, the dissipative coupling that can be detected via the effect of LA is of particular interest for developing cavity magnonics.…”

Section: Introductionmentioning

confidence: 99%

Dissipative couplings in cavity magnonics

Wang

2020

Journal of Applied Physics

114

View full text Add to dashboard Cite

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.

show abstract

“…However, in most of these works, being able to control the coupling constant is imperative; whether the ultimate goal is to achieve stronger coupling or to control the actual state of coupling [20]. While most of the aforementioned initial studies have concentrated in the case of level repulsion , leading to said avoided level crossing-also known as Rabi splitting [21]-more recently, another phenomenon has emerged : the so-called 'level attraction' [22][23][24][25][26]. In order to achieve the regime of level attraction, several approaches have been employed so far.…”

Section: Introductionmentioning

confidence: 99%

Steering between level repulsion and attraction: broad tunability of two-port driven cavity magnon-polaritons

et al. 2019

Self Cite

View full text Add to dashboard Cite

Cavity-magnon polaritons (CMPs) are the associated quasiparticles of the hybridization between cavity photons and magnons in a magnetic sample placed in a microwave resonator. In the strong coupling regime, where the macroscopic coupling strength exceeds the individual dissipation, there is a coherent exchange of information. This renders CMPs as promising candidates for future applications such as in information processing. Recent advances on the study of the CMP now allow not only for creation of CMPs on demand, but also for tuning of the coupling strength-this can be thought of as the enhancement or suppression of information exchange. Here, we go beyond standard single-port driven CMPs and employ a two-port driven CMP. We control the coupling strength by the relative phase f and amplitude field ratio δ 0 between both ports. Specifically, we derive a new expression from input-output theory for the study of the two-port driven CMP and discuss the implications on the coupling strength. Furthermore, we examine intermediate cases where the relative phase is tuned between its maximal and minimal value and, in particular, the high δ 0 regime, which has not been yet explored.

show abstract

Microscopic origin of level attraction for a coupled magnon-photon system in a microwave cavity

Cited by 30 publications

References 41 publications

The microscopic origin of magnon-photon level attraction by traveling waves: Theory and experiment

The microscopic origin of magnon-photon level attraction by traveling waves: Theory and experiment

Dissipative couplings in cavity magnonics

Steering between level repulsion and attraction: broad tunability of two-port driven cavity magnon-polaritons

Contact Info

Product

Resources

About