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Recently, a series of two-dimensional (2D) nonmagnetic layered materialsXSi2Y4 (X=transition metals; Y=pnictogens) having similar crystal structureswith transition-metal dichalcogenides (TMDs) were proposed for their potentialapplication value. Like TMDs, we propose that chiral phonon involvedvalley-selective optical circular dichroism can be also obtained in XSi2Y4, andit can be further entangled with multiple Hall effects. However, it isdifficult to compare such effect between XSi2Y4 and TMDs due to the non-unifiedconventions for pseudo-angular momentum (PAM) in the previous studies. Here weuse MoSi2As4 and MoS2 as examples to establish unified convention for bothphonon PAM and electronic PAM, together with showing their similarities anddifferences in crystal structure, band structures and valley-selective opticalcircular dichroism. In particular, we find in MoSi2As4, the chiral phononemission/absorption, the spin, the valley and the transverse Hall current, canbe modulated by changing either the energy or the handedness of the incidentlight, which show better performance than TMDs.

Chiral phonons entangled with multiple Hall effects and unified convention for pseudoangular momentum in 2D materials