Magnon squeezing states in a ferromagnet

Wang, Junfeng; Cheng, Ze; Ping, Yunxia; Wan, Jinyin; Zhang, Yanmin

doi:10.1016/j.physleta.2006.01.005

Cited by 10 publications

(15 citation statements)

References 18 publications

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“…[1][2][3][4] for reviews) with applications directed to quantum computing, optical communications, etc. For magnetic materials the squeezing of magnons (or spin waves) was first studied in antiferromagnets [5][6][7] based on a mechanism of two sublattices, whereas in ferromagnets mechanisms depending on the crystal field anisotropy [5] and four-magnon interactions [8] were initially proposed. More recently we found that the parallel pumping of the magnons in ferromagnets, via parametric excitation of a pair of magnons, also led to squeezing [9].…”

Section: Introductionmentioning

confidence: 99%

Squeezing and time evolution of magnon states under perpendicular pumping

Haghshenasfard¹,

Cottam²

2018

J. Phys.: Condens. Matter

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The coherent magnon state representation is employed to investigate the quantum-statistical behavior of the nonlinear excitation of magnons in ferromagnets. Both the long-range magnetic dipole-dipole and short-range exchange interactions are included, along with a static longitudinal applied field and a microwave pumping field in the perpendicular orientation. Within a microscopic (or Hamiltonian-based) approach the total Hamiltonian is transformed from spin operators to a normal-mode set of boson creation and annihilation operators. When the three-magnon interactions are included, it is found that the microwave pumping field may be used to control the nonlinear statistical properties of the system. From a study of the time evolution of the system we deduce the average number of magnons, the super-Poissonian statistical behavior, and the occurrence of magnon squeezing. We also compare the results with the case where the microwave pumping field is in the parallel orientation, and it is found that there are important differences in the time dependence.

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Section: Introductionmentioning

confidence: 99%

Squeezing and time evolution of magnon states under perpendicular pumping

Haghshenasfard¹,

Cottam²

2018

J. Phys.: Condens. Matter

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“…However, magnon squeezed states which are dependent of temperature in ferromagnets is given little attention. Since Thermofield Dynamics (TFD) was invented [15][16][17][18] to describe the thermal communication between systems and reservoirs more conveniently, the squeeze mechanism which is dependent of temperature is introduced comprehensively. In this paper, we show that the magnon system at low temperature can be in the squeezed state by the nonlinear interaction between magnon and magnon.…”

Section: Introductionmentioning

confidence: 99%

Thermofield Analysis of Magnon Squeezing State in the Ferromagnet

Cheng

Ping

2008

Mod. Phys. Lett. B

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In this paper, we introduce the self-consistent field approximation to treat with the nonlinear interaction among spin waves. Then temperature-dependent Bogoliubov transformation is introduced to generate a new representation which engenders the transition from the zero temperature to the finite temperature. At last, temperature-dependent quantum fluctuation properties of magnons are discussed in the thermal field. At lower temperature, we find that the fluctuation of spin-component at some given time regions can be below the zero-point fluctuation level of the vacuum state and exhibit a periodical squeezing behavior. In particular, these squeezed effects vanish with the increasing of temperature. These squeezing effects differ from the previous studies.

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“…Parametric squeezing of magnons in ferro-and ferrimagnets has been discussed in the literature but only theoretically [17][18][19]. Ref.…”

mentioning

confidence: 99%

“…Ref. [17] considered three-magnon based squeezing, and [19] four-magnon one. Both works were carried out for an unconfined ferro-/ferrimagnetic medium.…”

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confidence: 99%

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Towards experimental observation of parametrically squeezed states of microwave magnons in yttrium iron garnet films

et al. 2019

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We demonstrate theoretically, and confirm experimentally, that nonlinear spin waves excited in thin yttrium iron garnet films are good candidates for squeezing vacuum quantum noise. The experimental demonstration is in the form of a measurement of spin-wave induced modulation instability (IMI) conducted in the classical regime. The experiment evidences strong phase locking of an idler wave parametrically generated in the film with a deterministic small-signal wave launched into the film from an external source. The theory predicts that the same behavior will be observed for vacuum quantum noise, resulting in squeezing of the noise.

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Magnon squeezing states in a ferromagnet

Cited by 10 publications

References 18 publications

Squeezing and time evolution of magnon states under perpendicular pumping

Squeezing and time evolution of magnon states under perpendicular pumping

Thermofield Analysis of Magnon Squeezing State in the Ferromagnet

Towards experimental observation of parametrically squeezed states of microwave magnons in yttrium iron garnet films

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