Superradiant Phase Transition in a Superconducting Circuit in Thermal Equilibrium
Motoaki Bamba, Kunihiro Inomata, Yasunobu Nakamura
DOI 10.1103/PhysRevLett.117.173601 · Physical Review Letters
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Abstract
We propose a superconducting circuit that shows a superradiant phase transition (SRPT) in thermal equilibrium. The existence of the SRPT is confirmed analytically in the limit of an infinite number of artificial atoms. We also perform a numerical diagonalization of the Hamiltonian with a finite number of atoms and observe an asymptotic behavior approaching the infinite limit as the number of atoms increases. The SRPT can also be interpreted intuitively in a classical analysis.
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