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Finding a Bridge Between Quantum Optics, Thermodynamics, and Condensed Matter Physics
In 1973, physics theory predicted a superradiant
phase transition (SRPT) in the Dicke model
The SRPT bridges thermodynamics, quantum optics, and
condensed matter physics and can lead to new,
technologically relevant phenomena
However, no experimental evidence for
light-based SRPT found yet
Can we find an SRPT in
matter-matter interactions?
Magnonic SRPT found in ErFeO3
Light
Spin wave
(magnons) in Fe
Electromagnetic
transition in atoms
Electron
paramagnetic
resonance in
Er atoms
Experimental study
found Dicke
cooperativity
(tentative evidence
of SRPT) 0.2
0.4
0.6
Theoretical study
confirmed magnonic
version of the SRPT
Insight relevant for applications in:
Upcoming quantum technology,
such as quantum computing
and quantum sensing
Direct conversion
of heat into
coherent light
2018 2020
Strong interaction
between matter
(charge, spin, etc.)
and light
Incoherent (random) electromagnetic
polarization and incoherent
electromagnetic wave (thermal
radiation) are obtained by thermal
motion of particles in matter
Static coherent electromagnetic
polarization and static coherent
electromagnetic field appear
spontaneously in thermal equilibrium
At high temperature
At low temperature
Magnonic Superradiant Phase Transition
Bamba et al. (2022) | Communications Physics | DOI: 10.1038/s42005-021-00785-z
Motoaki Bamba
bamba.motoaki.y13@kyoto-u.jp

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Finding a Bridge Between Quantum Optics, Thermodynamics, and Condensed Matter Physics

  • 1. Finding a Bridge Between Quantum Optics, Thermodynamics, and Condensed Matter Physics In 1973, physics theory predicted a superradiant phase transition (SRPT) in the Dicke model The SRPT bridges thermodynamics, quantum optics, and condensed matter physics and can lead to new, technologically relevant phenomena However, no experimental evidence for light-based SRPT found yet Can we find an SRPT in matter-matter interactions? Magnonic SRPT found in ErFeO3 Light Spin wave (magnons) in Fe Electromagnetic transition in atoms Electron paramagnetic resonance in Er atoms Experimental study found Dicke cooperativity (tentative evidence of SRPT) 0.2 0.4 0.6 Theoretical study confirmed magnonic version of the SRPT Insight relevant for applications in: Upcoming quantum technology, such as quantum computing and quantum sensing Direct conversion of heat into coherent light 2018 2020 Strong interaction between matter (charge, spin, etc.) and light Incoherent (random) electromagnetic polarization and incoherent electromagnetic wave (thermal radiation) are obtained by thermal motion of particles in matter Static coherent electromagnetic polarization and static coherent electromagnetic field appear spontaneously in thermal equilibrium At high temperature At low temperature Magnonic Superradiant Phase Transition Bamba et al. (2022) | Communications Physics | DOI: 10.1038/s42005-021-00785-z Motoaki Bamba bamba.motoaki.y13@kyoto-u.jp