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Title: Exfoliation energy, quasiparticle band structure, and excitonic properties of selenium and tellurium atomic chains

Journal Article · · Physical Review B

Effects that are not captured by the generalized-gradient density-functional theory have a prominent effect on the structural binding and on the electronic and optical properties of reduced-dimensional and weakly bound materials. Here, we report the exfoliation energy of selenium and tellurium atomic chains with nonempirical van der Waals corrections, and their electronic and optical properties with the GW and Bethe-Salpeter formalisms. The exfoliation energy is found to be within 0.547–0.719 eV/u.c. for the selenium atomic chain, and 0.737–0.926 eV/u.c. for the tellurium atomic chain (where u.c. stands for unit cell), depending on the approximation for the van der Waals interaction and the numerical tool chosen. The GW electronic band gap turned out to be 5.22–5.47 (4.44–4.59) eV for the Se (Te) atomic chains, with the lowest bound obtained with the Godby-Needs (GN), and the upper bound to the Hybertsen-Louie (HL) plasmon-pole models (PPMs). The binding energy of the ground-state excitonic state ranges between 2.69 and 2.72 eV for selenium chains within the HL and GN PPM, respectively, and it turned out to be 2.35 eV for tellurium chains with both approximations. In conclusion, the ground-state excitonic wave function is localized within 50 Å along the axis for both types of atomic chains, and its energy lies within the visible spectrum: blue [2.50(GN)–2.78(HL) eV] for selenium and yellow-green [2.09(GN)–2.28(HL) eV] for tellurium, which could be useful for LED applications in the visible spectrum.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
DMR-1610126
OSTI ID:
1544250
Journal Information:
Physical Review B, Vol. 98, Issue 3; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (6)

Raman response and transport properties of tellurium atomic chains encapsulated in nanotubes journal February 2020
A honeycomb-like monolayer of HfO 2 and the calculation of static dielectric constant eliminating the effect of vacuum spacing journal January 2018
Even–odd oscillation of bandgaps in GeP 3 nanoribbons and a tunable 1D lateral homogenous heterojunction journal January 2019
Temperature, strain and charge mediated multiple and dynamical phase changes of selenium and tellurium journal January 2020
Stabilizing the isolated Sn 2 Bi nanosheet and tailoring its electronic structure by chemical functionalization: A computational study journal February 2019
Dependence of excited-state properties of tellurium on dimensionality: From bulk to two dimensions to one dimensions journal August 2018

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