报告题目：Gravitational and relativistic deflection of X-ray superradiance
报 告 人：廖文德 教授（台湾国立中央大学）
Einstein predicted that clocks at different altitudes tick at various rates under the influence of gravity. This effect has been observed using 57Fe M?ssbauer spectroscopy over an elevation of 22.5?m or by comparing accurate optical clocks at different heights on a submetre scale. However, challenges remain in finding novel methods for the detection of gravitational and relativistic effects on more compact scales. Here, we investigate a scheme that potentially allows for millimetre- to submillimetre-scale studies of the gravitational redshift by probing a nuclear crystal with X-rays. Also, a rotating crystal can force interacting X-rays to experience inhomogeneous clock tick rates within it. We find that an association of gravitational redshift and special-relativistic time dilation with quantum interference is manifested by a time-dependent deflection of X-rays. The scheme suggests a table-top solution for probing gravitational and special-relativistic effects, which should be within the reach of current experimental technology.
W.-T. Liao and S. Ahrens, Nat. Photon. 9, 169 (2015).
Prof. Wen-Te Liao received his PhD in Heidelberg University and Max Planck institute for nuclear physics in 2013. He worked in Center for Free Electron Laser Science at DESY during 2014-2015 as a postdoc. Since August 2015 he became an assistant professor in National Central university in Taiwan. His research focuses on x-ray and optical quantum optics. Till now he has contributed 16 peer-reviewed papers (Nature photonics, PRL et al.) and 36 invited talks. His PhD dissertation had been selected and published as Springer Theses.