Time and space are two very important basic concepts in philosophy and nature.In special relativity we proved that there are necessarily two symmetrical topological structures separated by the light-cone,which include...
This work is supported by the National Natural Science Foundation of China(11774228,12074250,11991073,11721091,and 12135009);Science_and_Technology Commission of Shanghai Municipality(16DZ2260200).
Terahertz radiation with a Bessel beam profile is demonstrated experimentally from a two-color laser filament in air,which is induced by tailored femtosecond laser pulses with an axicon.The temporal and spatial distri...
Entanglement and the tunnel effect phenomena have been repeatedly observed and are generically accepted under orthodox quantum mechanics formalism. However, they remain rather inexplicable in the context of spacetime ...
supported by the European Research Council POLAFLOW Grant 308136 and the Italian MIUR project Beyond Nano;supported by the NCN Grant no.2012/04/M/ST2/00789;MNiSW Iuventus Plus project no.IP 2014044873;support from the FNP project FIRST TEAM/2016-2/17;support from NCN Grant 2015/17/B/ST3/02273.
In this work,we experimentally demonstrate for the first time the spontaneous generation of two-dimensional exciton-polariton X-waves.X-waves belong to the family of localized packets that can sustain their shape with...
The propagation of narrow packets of electromagnetic waves(EMWs) in frequency dispersive medium with the consideration of the complex refractive index is studied. It is shown that counting in the dispersion of the c...
the support of the UK Engineering and Physical Sciences Research Council.
This paper reports the observation of ultra-superluminal pulse propagation in multiple-contact semiconductor heterostructures in a superradiant emission regime,and shows definitively that it is a different class of em...
This work was partly supported by the National Natural Science Foundation of China (Nos. 61275075 and 11274037), the Natural Science Foundation of Beijing (Nos. 4112042 and 4132035), the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20120009110032), and the Beijing Jiaotong University (No. 2012JBM103).
Based on the general mechanism of the coherent population oscillations, we propose the fundamental harmonic fractional delay (FHFD) to evaluate the superluminal and slow light propagation in semiconductor optical am...
In this article, a novel speculative method is used to derive the relativistic mechanic that governs the motion of the vibrating string within the compactified-dimensions spacetime. This mechanic claims that the relat...
Richard Feynman once said, “I think it is safe to say that no one understands Quantum Mechanics”. The well-known article on the Einstein-Podolsky-Rosen (EPR) paradox brought forth further doubts on the interpretatio...
We study the absorption-dispersion process and group index of weak probe field in a four-level Er^3+:YAG crystal.We find that the Er^3+ion concentration and incoherent pumping field can influence the absorption-dis...