Realizing and detecting the fundamental Weyl semimetal phase

There is an immense effort in search for various types of Weyl semimetals, of which the most fundamental phase consists of the minimal number of, i.e. two Weyl points. Such fundamental Weyl phase is of peculiar importance and, however, has not been observed due to the lack of reliable quantum material or feasible scheme for the realization and detection. Here we solve the existing challenges and demonstrate how the fundamental Weyl semimetal is realized with a maneuverable optical Raman lattice which is completely accessible in the experiment. Moreover, we propose the highly feasible technique to resolve the 3D band topology of the Weyl semimetal via only 2D measurements, with which the configuration of Weyl points can be precisely identified. This work is leading to the realization and detection of the most fundamental phase in Weyl semimetal family.