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Topological Dirac and Weyl semimetals, which support low-energyquasiparticles in condensed matter physics, are currently attracting intenseinterest due to exotic physical properties such as large magnetoresistance andhigh carrier mobilities. Transition metal diarsenides such as MoAs2 and WAs2have been reported to harbor very high magnetoresistance suggesting thepossible existence of a topological quantum state, although this conclusionremains dubious. Here, based on systematic angle-resolved photoemissionspectroscopy (ARPES) measurements and parallel first-principles calculations,we investigate the electronic properties of TAs2 (T = Mo, W). Importantly,clear evidence for switching the single-Dirac cone surface state in MoAs2 withthe cleaving plane is observed, whereas a Dirac state is not observed in WAs2despite its high magnetoresistance. Our study thus reveals the key role of theterminated plane in a low-symmetry system, and provides a new perspective onhow termination can drive dramatic changes in electronic structures.

Dirac state switching in transition metal diarsenides