Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states
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2025
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| author | Olkowska-Pucko, Katarzyna Woźniak, Tomasz Blundo, Elena Zawadzka, Natalia Kipczak, Łucja Junior, Paulo E. Faria Szpakowski, Jan Krasucki, Grzegorz Cianci, Salvatore Vaclavkova, Diana Jana, Dipankar Kapuściński, Piotr Pawbake, Amit Badola, Shalini Grzeszczyk, Magdalena Cecchetti, Daniele Pettinari, Giorgio Antoniazzi, Igor Sofer, Zdeněk Plutnarová, Iva Watanabe, Kenji Taniguchi, Takashi Faugeras, Clement Potemski, Marek Babiński, Adam Polimeni, Antonio Molas, Maciej R. |
| author_facet | Olkowska-Pucko, Katarzyna Woźniak, Tomasz Blundo, Elena Zawadzka, Natalia Kipczak, Łucja Junior, Paulo E. Faria Szpakowski, Jan Krasucki, Grzegorz Cianci, Salvatore Vaclavkova, Diana Jana, Dipankar Kapuściński, Piotr Pawbake, Amit Badola, Shalini Grzeszczyk, Magdalena Cecchetti, Daniele Pettinari, Giorgio Antoniazzi, Igor Sofer, Zdeněk Plutnarová, Iva Watanabe, Kenji Taniguchi, Takashi Faugeras, Clement Potemski, Marek Babiński, Adam Polimeni, Antonio Molas, Maciej R. |
| contents | Monolayers (MLs) of semiconducting transition metal dichalcogenides (\mbox{S-TMDs}) emit light very efficiently and display rich spin-valley physics, with gyromagnetic ($g$-) factors of about -4. Here, we investigate how these properties can be tailored by alloying. Magneto-optical spectroscopy is used to reveal the peculiar properties of excitonic complexes in Mo$_{x}$W$_{1-x}$Se$_2$ MLs with different Mo and W concentrations. We show that the alloys feature extremely high $g$-factors for neutral excitons, that change gradually with the composition up to reaching values of the order of -10 for $x \approx 0.2$. First-principles calculations corroborate the experimental findings and provide evidence that alloying in S-TMDs results in a non-trivial band structure engineering, being at the origin of the high $g$-factors. The theoretical framework also suggests a higher strain sensitivity of the alloys, making them promising candidates for tailor-made optoelectronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_23071 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states Olkowska-Pucko, Katarzyna Woźniak, Tomasz Blundo, Elena Zawadzka, Natalia Kipczak, Łucja Junior, Paulo E. Faria Szpakowski, Jan Krasucki, Grzegorz Cianci, Salvatore Vaclavkova, Diana Jana, Dipankar Kapuściński, Piotr Pawbake, Amit Badola, Shalini Grzeszczyk, Magdalena Cecchetti, Daniele Pettinari, Giorgio Antoniazzi, Igor Sofer, Zdeněk Plutnarová, Iva Watanabe, Kenji Taniguchi, Takashi Faugeras, Clement Potemski, Marek Babiński, Adam Polimeni, Antonio Molas, Maciej R. Materials Science Mesoscale and Nanoscale Physics Monolayers (MLs) of semiconducting transition metal dichalcogenides (\mbox{S-TMDs}) emit light very efficiently and display rich spin-valley physics, with gyromagnetic ($g$-) factors of about -4. Here, we investigate how these properties can be tailored by alloying. Magneto-optical spectroscopy is used to reveal the peculiar properties of excitonic complexes in Mo$_{x}$W$_{1-x}$Se$_2$ MLs with different Mo and W concentrations. We show that the alloys feature extremely high $g$-factors for neutral excitons, that change gradually with the composition up to reaching values of the order of -10 for $x \approx 0.2$. First-principles calculations corroborate the experimental findings and provide evidence that alloying in S-TMDs results in a non-trivial band structure engineering, being at the origin of the high $g$-factors. The theoretical framework also suggests a higher strain sensitivity of the alloys, making them promising candidates for tailor-made optoelectronic devices. |
| title | Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2503.23071 |