Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/6380
Title: Quartic dispersion, strong singularity, magnetic instability, and unique thermoelectric properties in two-dimensional hexagonal lattices of group-VA elements
Authors: Sevinçli, Haldun
Sevinçli, Haldun
Izmir Institute of Technology. Materials Science and Engineering
Keywords: Magnetic instability
Quartic dispersion
Thermoelectricity
Van Hove singularity
Two-dimensional materials
Issue Date: Apr-2017
Publisher: American Chemical Society
Source: Sevinçli, H. (2017). Quartic dispersion, strong singularity, magnetic instability, and unique thermoelectric properties in two-dimensional hexagonal lattices of group-VA elements. Nano Letters, 17(4), 2589-2595. doi:10.1021/acs.nanolett.7b00366
Abstract: The critical points and the corresponding singularities in the density of states of crystals were first classified by Van Hove with respect to their dimensionality and energy-momentum dispersions. Here, different from saddle-point Van Hove singularities, the occurrence of a continuum of critical points, which give rise to strong singularities in two-dimensional elemental hexagonal lattices, is shown using a minimal tight-binding formalism. The model predicts quartic energy-momentum dispersions despite quadratic or linear ones, which is also the origin of the strong singularity. Starting with this model and using first-principles density functional theory calculations, a family of novel two-dimensional materials that actually display such singularities are identified and their extraordinary features are investigated. The strong singularity gives rise to ferromagnetic instability with an inverse-square-root temperature dependence and the quartic dispersion is responsible for a steplike transmission spectrum, which is a characteristic feature of one-dimensional systems. Because of the abrupt change in transmission at the band edge, these materials have temperature-independent thermopower and enhanced thermoelectric efficiencies. Nitrogene has exceptionally high thermoelectric efficiencies at temperatures down to 50 K, which could make low-temperature thermoelectric applications possible.
URI: http://doi.org/10.1021/acs.nanolett.7b00366
http://hdl.handle.net/11147/6380
ISSN: 1530-6984
1530-6984
1530-6992
Appears in Collections:Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Files in This Item:
File Description SizeFormat 
6380.pdfMakale2.01 MBAdobe PDFThumbnail
View/Open
Show full item record

CORE Recommender

SCOPUSTM   
Citations

18
checked on Jul 31, 2021

WEB OF SCIENCETM
Citations

21
checked on Jul 31, 2021

Page view(s)

12
checked on Aug 5, 2021

Download(s)

22
checked on Aug 5, 2021

Google ScholarTM

Check

Altmetric


Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.