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While only two compounds (MoSi<jats:sub>2<\/jats:sub>N<jats:sub>4<\/jats:sub> and WSi<jats:sub>2<\/jats:sub>N<jats:sub>4<\/jats:sub>) are recently synthesized, theory predicts interesting (opto)electronic properties of a whole new family of such two\u2010dimensional\u00a0(2D) materials. Here, the chemical trends of band gaps and spin\u2010orbit splittings of bands in selected MSi<jats:sub>2<\/jats:sub>Z<jats:sub>4<\/jats:sub> (M = Mo, W; Z = N, P, As, Sb) compounds are studied from first\u2010principles. Effective Bethe\u2013Salpeter\u2010equation\u2010based calculations reveal high exciton binding energies. Evolution of excitonic energies under external magnetic field is predicted by providing their effective <jats:italic>g<\/jats:italic>\u2010factors and diamagnetic coefficients, which can be directly compared to experimental values. In particular, large positive <jats:italic>g<\/jats:italic>\u2010factors are predicted for excitons involving higher conduction bands. In view of these predictions, MSi<jats:sub>2<\/jats:sub>Z<jats:sub>4<\/jats:sub> monolayers yield a new platform to study excitons and are attractive for optoelectronic devices, also in the form of heterostructures. In addition, a spin\u2010orbit induced bands inversion is observed in the heaviest studied compound, WSi<jats:sub>2<\/jats:sub>Sb<jats:sub>4<\/jats:sub>, a hallmark of its topological\u00a0nature.<\/jats:p>","DOI":"10.1002\/smll.202206444","type":"journal-article","created":{"date-parts":[[2023,2,11]],"date-time":"2023-02-11T09:58:53Z","timestamp":1676109533000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Electronic and Excitonic Properties of MSi<sub>2<\/sub>Z<sub>4<\/sub> Monolayers"],"prefix":"10.1002","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2290-5738","authenticated-orcid":false,"given":"Tomasz","family":"Wo\u017aniak","sequence":"first","affiliation":[{"name":"Department of Semiconductor Materials Engineering Wroc\u0142aw University of Science and Technology  Wroc\u0142aw 50\u2010370 Poland"},{"name":"Department of Physics and Earth Sciences Jacobs University Bremen  Campus Ring 1 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