克尔非线性黑体中光超流态的研究

Investigation of photonic superfluidity in a Kerr nonlinear blackbody

研究了克尔非线性黑体中一种新的光超流态.研究表明:非线性黑体中具有相反波矢和旋量的裸光子结合成对,未成对的裸光子则转换成一种新的准粒子——非极化激元;光子对系统是一个超流态,而非极化激元系统是一个正常流态.正常流态的光谱能量密度和辐射压强都比普通黑体大并且随温度单调增加.在理论上证明了克尔非线性黑体中光超流态的存在并给出了测量这种光超流态的方法.

A new kind of photonic superfluid state in a Kerr nonlinear blackbody was investigated, in which bare photons with opposite wave vectors and helicities were bound into pairs and unpaired bare photons were transformed into a new kind of quasi-particle, the nonpolariton. It is explored that the photon-pair system is a superfluid and the nonpolariton system is a normal fluid. Both spectral energy density and radiation pressure of the normal fluid are larger than those of the normal blackbody, furthermore, they are monotonically increasing functions of temperature. We theoretically verify the existence of the photonic superfluid state in a Kerr nonlinear blackbody and present a feasible way of measuring the radiation properties of such photonic superfluid state.