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There has been an upsurge in the discovery of topological quantum materials,where various topological insulators and semimetals have been theoreticallypredicted and experimentally observed. However, only very few of them containssilicon, the most widely used element in electronic industry. Recently, ternarycompound CaAl2Si2 has been predicted to be a topological Dirac semimetal,hosting Lorentz-symmetry-violating quasiparticles with a strongly tiltedconical band dispersion. In this work, by using high-resolution angle-resolvedphotoemission spectroscopy (ARPES), we investigated the comprehensiveelectronic structure of CaAl2Si2. A pair of topological Dirac crossings isobserved along the kz direction, in good agreement with the ab initiocalculations, confirming the topological Dirac semimetal nature of thecompound. Our study expands the topological material family on Si-containingcompounds, which have great application potential in realizing low-cost,nontoxic electronic device with topological quantum states.

Electronic structure of a Si-containing topological Dirac semimetal CaAl2Si2