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Vertical Quantum Confinement in Bulk MoS2 Obando Guevara, Jairo González García, Álvaro Rosmus, Marcin Olszowska, Natalia González Barrio, Miguel Ángel González Pascual, César Tejeda, Antonio Mascaraque Susunaga, Arantzazu CT82/20-CT83/20 NT-09-618999 We experimentally observe quantum confinement states in bulk MoS2 by using angle-resolved photoemission spectroscopy (ARPES). The band structure at the Gamma point reveals quantum well states (QWSs) linked to vertical quantum confinement of the electrons, confirmed by the absence of dispersion in k z and a strong intensity modulation with the photon energy. Notably, the binding energy dependence of the QWSs versus n does not follow the quadratic dependence of a two-dimensional electron gas. Instead, a linear behavior is observed that is consistent with a parabolic-like quantum well. This confinement arises from the mechanical exfoliation preparation method, which leads to the detachment of a multilayer stack from the underlying bulk. This is confirmed by density functional theory (DFT) calculations. The quantum confinement in bulk-like MoS2 not only offers the opportunity to explore intersubband transitions to exploit optical properties but also provides a means to study fundamental quantum phenomena in multilayer stacks of different thicknesses. 2025-02-18T17:56:24Z 2025-02-18T17:56:24Z 2025-01 journal article Obando-Guevara, Jairo, et al. «Vertical Quantum Confinement in Bulk MoS2». ACS Nano, vol. 19, n.o 2, enero de 2025, pp. 2540-48. DOI.org (Crossref), https://doi.org/10.1021/acsnano.4c13992 1936-0851 10.1021/acsnano.4c13992 https://hdl.handle.net/20.500.14352/118180 1936-086X https://dx.doi.org/10.1021/acsnano.4c13992 https://pubs.acs.org/doi/full/10.1021/acsnano.4c13992 eng info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-117024GB-C43/ES/NUEVOS MATERIALES PARA UNA CONMUTACION MAGNETICA EFICIENTE EN LA NANOESCALA / info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-123112OB-C21/ES/ S2108-NMT4321/MatMagSwitch embargoed access ACS Publications