Extremely high excitonic g-factors in 2D crystals by alloy-induced admixing of band states
Abstract
Monolayers (MLs) of semiconducting transition metal dichalcogenides (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 MoxW1-xSe₂ 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 ≈ 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.
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BibTeX
@article{olkowskapucko2026extremely,
title = {{Extremely high excitonic g-factors in 2D crystals by alloy-induced admixing of band states}},
author = {Katarzyna Olkowska-Pucko and Tomasz Woźniak and Elena Blundo and Natalia Zawadzka and Łucja Kipczak and Paulo Faria Junior and Jan Szpakowski and Grzegorz Krasucki and Salvatore Cianci and Diana Vaclavkova and Dipankar Jana and Piotr Kapuściński and Amit Pawbake and Shalini Badola and Magdalena Grzeszczyk and Daniele Cecchetti and Giorgio Pettinari and Igor Antoniazzi and Zdeněk Sofer and Iva Plutnarová and Kenji Watanabe and Takashi Taniguchi and Clément Faugeras and Marek Potemski and Adam Babiński and Antonio Polimeni and Maciej Molas},
journal = {Physical Review Letters},
year = {2026},
month = sep,
doi = {10.1103/lx4n-7bb7},
eprint = {2503.23071},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05767105v1},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - JOUR
TI - Extremely high excitonic g-factors in 2D crystals by alloy-induced admixing of band states
AU - Katarzyna Olkowska-Pucko
AU - Tomasz Woźniak
AU - Elena Blundo
AU - Natalia Zawadzka
AU - Łucja Kipczak
AU - Paulo Faria Junior
AU - Jan Szpakowski
AU - Grzegorz Krasucki
AU - Salvatore Cianci
AU - Diana Vaclavkova
AU - Dipankar Jana
AU - Piotr Kapuściński
AU - Amit Pawbake
AU - Shalini Badola
AU - Magdalena Grzeszczyk
AU - Daniele Cecchetti
AU - Giorgio Pettinari
AU - Igor Antoniazzi
AU - Zdeněk Sofer
AU - Iva Plutnarová
AU - Kenji Watanabe
AU - Takashi Taniguchi
AU - Clément Faugeras
AU - Marek Potemski
AU - Adam Babiński
AU - Antonio Polimeni
AU - Maciej Molas
PY - 2026
DA - 2026/09/28
JO - Physical Review Letters
DO - 10.1103/lx4n-7bb7
UR - https://hal.science/hal-05767105v1
AB - Monolayers (MLs) of semiconducting transition metal dichalcogenides (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 MoxW1-xSe₂ 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 ≈ 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.
SN - 0031-9007
SN - 1079-7114
ER -