Adaptation of Fluctuating Magnetoacoustic System to External Signals

The adaptation of systems to external influences is of broad interest. We study the influence of microwave signals of different shapes on the magnetoacoustic wave system with a giant nonlinearity in canted antiferromagnet FeBO3 at room temperature, which is close to its phase transition to the paramagnetic state. The classical nonlinear system obeys external deterministic signals; the modulation response describes the shape of these signals. In response to a noisy spectrum, the system shows self-organization, and mode competition selects one excited mode while suppressing others. With an increase in the power of the external signal, another self-organization is observed in the form of a narrow peak at the frequency of the fundamental minimum. This represents the first observation of the macroscopic quantum statistical phenomenon, Bose-Einstein condensation of magnetoacoustic wave quanta in a wave system with a high level of thermal fluctuations. The resulting picture of adaptation can analogously be transferred to many other adaptive wave systems, including large scale adaptive wave systems in the natural environment.

[1]  Michel Pernet,et al.  Structure magnetique du metaborate de fer FeBO3 , 1970 .

[2]  C. Kharif.  Rogue and shock waves in nonlinear dispersive media , 2015 .

[3]  Frank Vewinger,et al.  Bose–Einstein condensation of photons in an optical microcavity , 2010, Nature.

[4]  Roy,et al.  Quantum fluctuations, pump noise, and the growth of laser radiation. , 1985, Physical review letters.

[5]  W. Wettling,et al.  Growth and properties of iron borate, FeBO3 , 1984 .

[6]  Agarwal,et al.  Lasing without inversion in the absence of a coherent coupling field. , 1995, Physical review. A, Atomic, molecular, and optical physics.

[7]  A. Serga,et al.  Bose–Einstein condensation of quasi-equilibrium magnons at room temperature under pumping , 2006, Nature.

[8]  G. Iglesias,et al.  Wave Power - Climate Change Mitigation and Adaptation , 2015 .

[9]  V. Safonov,et al.  Nuclear spin wave research , 1991 .

[10]  M. Katsnelson,et al.  Measuring the Dzyaloshinskii–Moriya interaction in a weak ferromagnet , 2014, Nature Physics.

[11]  V. Ozhogin,et al.  Anharmonicity of mixed modes and giant acoustic nonlinearity of antiferromagnetics , 1988 .

[12]  V. Safonov,et al.  Bose-Einstein condensation of mexons in hematite at +210 °C , 2019, Applied Physics Letters.

[13]  M. Mariton,et al.  Control of complex systems , 1991 .

[14]  Jason Brownlee,et al.  Complex adaptive systems , 2007 .

[15]  J. Davidson,et al.  Efficient Nonlinear Hydrodynamic Models for Wave Energy Converter Design—A Scoping Study , 2020 .

[16]  Gregory Falkovich,et al.  Kolmogorov Spectra of Turbulence I: Wave Turbulence , 1992 .