Vertical quantum confinement in bulk MoS₂

@misc{obandoguevara2026vertical,
  title = {{Vertical quantum confinement in bulk MoS$_2$}},
  author = {Jairo Obando-Guevara and Álvaro González-García and Marcin Rosmus and Natalia Olszowska and César González and Miguel Ángel González-Barrio and Antonio Tejeda and Arantzazu Mascaraque},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.07950},
  eprint = {2609.07950},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.07950},
}

TY  - UNPB
TI  - Vertical quantum confinement in bulk MoS_2
AU  - Jairo Obando-Guevara
AU  - Álvaro González-García
AU  - Marcin Rosmus
AU  - Natalia Olszowska
AU  - César González
AU  - Miguel Ángel González-Barrio
AU  - Antonio Tejeda
AU  - Arantzazu Mascaraque
PY  - 2026
DA  - 2026/09/07
PB  - arXiv
DO  - 10.48550/arxiv.2609.07950
UR  - https://arxiv.org/abs/2609.07950
AB  - We experimentally observe quantum confinement states in bulk MoS_2 using Angle-Resolved Photoemission Spectroscopy (ARPES). The band structure at the Γ̅ 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 photon energy. Notably, the binding energy dependence of the QWSs vs n does not follow the quadratic dependence of a two-dimensional electron gas. Instead, a linear behaviour 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 MoS_2 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.
ER  -