Role of Chalcogen-p States in the Optical Response of Bulk PtSe2 and PtTe2
Abstract
The type-II Dirac semimetals PtSe2 and PtTe2 are isostructural and isovalent layered compounds but exhibit distinct electronic properties. We measure the in-plane infrared reflectivity of bulk crystals between 10 and 300 K and compare the interband contribution to the optical conductivity with band-resolved density-functional calculations. At low temperature, the Drude spectral weight of PtTe2 is an order of magnitude larger than that of PtSe2. PtTe2 also shows a broad mid-infrared absorption continuum, whereas the absorption of PtSe2 remains weak. The calculations attribute this continuum to transitions from a predominantly chalcogen-p band into a Pt-d band. In PtTe2, the chalcogen-p band lies higher in energy, which lowers the onset of these transitions and increases the semimetallic band overlap, in line with the larger Drude spectral weight. The type-II Dirac points lie far below the Fermi level, so that transitions between the bands forming the Dirac cones do not contribute appreciably to the interband conductivity.
Related
- Drift Reduction in 2D PtSe2 Piezoresistive Pressure Sensors Through an On‐Chip Wheatstone Bridge
- Triple-band nonreciprocal optical Tamm states in a Weyl-semimetal/Fibonacci-type photonic heterostructure
- Geometry-Controlled Polarization Photocurrents in Scalable PtSe2 Infrared Pixels
- Graphene-Confined Growth of Few-Layer PtSe2 via One-Step Selenization
- Subdimensional linear-optical quantum computation: from qudit resource states to qubit quantum computation
BibTeX
@misc{lee2026role,
title = {{Role of Chalcogen-p States in the Optical Response of Bulk PtSe2 and PtTe2}},
author = {Ji Eun Lee and R. Mathew Roy and Premakumar Yanda and Chandra Shekhar and Claudia Felser and Martin Dressel},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.30978},
eprint = {2610.30978},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.30978},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Role of Chalcogen-p States in the Optical Response of Bulk PtSe2 and PtTe2
AU - Ji Eun Lee
AU - R. Mathew Roy
AU - Premakumar Yanda
AU - Chandra Shekhar
AU - Claudia Felser
AU - Martin Dressel
PY - 2026
DA - 2026/10/22
PB - arXiv
DO - 10.48550/arxiv.2610.30978
UR - https://arxiv.org/abs/2610.30978
AB - The type-II Dirac semimetals PtSe_2 and PtTe_2 are isostructural and isovalent layered compounds but exhibit distinct electronic properties. We measure the in-plane infrared reflectivity of bulk crystals between 10 and 300 K and compare the interband contribution to the optical conductivity with band-resolved density-functional calculations. At low temperature, the Drude spectral weight of PtTe_2 is an order of magnitude larger than that of PtSe_2. PtTe_2 also shows a broad mid-infrared absorption continuum, whereas the absorption of PtSe_2 remains weak. The calculations attribute this continuum to transitions from a predominantly chalcogen-p band into a Pt-d band. In PtTe_2, the chalcogen-p band lies higher in energy, which lowers the onset of these transitions and increases the semimetallic band overlap, in line with the larger Drude spectral weight. The type-II Dirac points lie far below the Fermi level, so that transitions between the bands forming the Dirac cones do not contribute appreciably to the interband conductivity.
ER -