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Extremely High Excitonic $g$ Factors in 2D Crystals by Alloy-Induced Admixing of Band States

Katarzyna Olkowska-Pucko ^1,*, Tomasz Woźniak ^1,2,†, Elena Blundo ^3,‡, Natalia Zawadzka ¹, Łucja Kipczak ¹, Paulo E. Faria Junior ^4,5, Jan Szpakowski¹, Grzegorz Krasucki ¹, Salvatore Cianci ³ et al.

Diana Vaclavkova ⁶, Dipankar Jana ^6,7, Piotr Kapuściński ⁶, Amit Pawbake⁶, Shalini Badola ⁶, Magdalena Grzeszczyk ^1,7, Daniele Cecchetti ⁸, Giorgio Pettinari ⁸, Igor Antoniazzi ¹, Zdeněk Sofer ⁹, Iva Plutnarová ⁹, Kenji Watanabe ¹⁰, Takashi Taniguchi ¹¹, Clement Faugeras ⁶, Marek Potemski ^1,6,12, Adam Babiński ¹, Antonio Polimeni ³, and Maciej R. Molas ^1,§

¹Faculty of Physics, University of Warsaw, 02-093 Warsaw, Poland
²Institute of Theoretical Physics, Wroclaw University of Science and Technology, 50-730 Wroclaw, Poland
³Physics Department, Sapienza University of Rome, 00185 Rome, Italy
⁴Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
⁵Department of Electrical and Computer Engineering, University of Central Florida, Orlando, Florida 32816, USA
⁶Laboratoire National des Champs Magnétiques Intenses, CNRS-UGA-UPS-INSA-EMFL, 38042 Grenoble, France
⁷Institute for Functional Intelligent Materials, National University of Singapore, Singapore 117544, Singapore
⁸Institute for Photonics and Nanotechnologies, National Research Council (CNR-IFN), 00133 Rome, Italy
⁹Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic
¹⁰Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
¹¹Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
¹²CENTERA, CEZAMAT, Warsaw University of Technology, Warsaw, Poland

^*Contact author: katarzyna.olkowska-pucko@fuw.edu.pl
^†Contact author: tomasz.wozniak@pwr.edu.pl
^‡Contact author: elena.blundo@uniroma1.it
^§Contact author: maciej.molas@fuw.edu.pl

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Phys. Rev. Lett. 136, 076901 – Published 17 February, 2026

DOI: https://doi.org/10.1103/lx4n-7bb7

Abstract

Monolayers (MLs) of semiconducting transition metal dichalcogenides 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 metal 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 quantitatively identify the alloy-induced mixing between different conduction band valleys as the underlying mechanism originating the anomalous composition dependence of the neutral exciton $g$ factor. The theoretical framework also suggests a high strain sensitivity of the alloys, making them promising candidates for tailor-made optoelectronic devices.

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Phys. Rev. Lett. 136, 076901– Published 17 February, 2026

Vol. 136, Iss. 7 — 20 February 2026

Received 3 March 2025
Revised 1 October 2025
Accepted 22 December 2025

DOI: https://doi.org/10.1103/lx4n-7bb7

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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Extremely High Excitonic $g$ Factors in 2D Crystals by Alloy-Induced Admixing of Band States

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Extremely High Excitonic g Factors in 2D Crystals by Alloy-Induced Admixing of Band States

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Extremely High Excitonic $g$ Factors in 2D Crystals by Alloy-Induced Admixing of Band States