Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session W17: Topological Materials and Platforms
3:00 PM–5:48 PM,
Thursday, March 7, 2024
Room: M100H
Sponsoring
Unit:
DCMP
Chair: Qunfei Zhou, University of Kansas
Abstract: W17.00005 : Connecting Higher-Order Topology with the Orbital Hall Effect in Monolayers of Transition Metal Dichalcogenides*
3:48 PM–4:00 PM
Presenter:
Marcio Costa
(Universidade Federal Fluminense)
Authors:
Marcio Costa
(Universidade Federal Fluminense)
Bruno Focassio
(Univ Federal do ABC)
Tarik P Cysne
(Universidade Federal Fluminense)
Luis M Canonico
(ICN2)
Gabriel R Schleder
(Harvard University)
Roberto B B Muniz
(Universidade Federal Fluminense)
Adalberto Fazzio
(Ilum/CNPEM)
Tatiana G Rappoport
(Minho University)
Using density functional theory, we confirm the characteristics of 2H-TMDs and reveal that 1T-TMDs are identified by a $mathbb{Z}_4$ topological invariant.
As a result, when cut along appropriate directions, they host conducting edge-states, which cross their bulk energy-band gaps and can transport orbital angular momentum.
Our linear response calculations thus indicate that the HOTI phase is accompanied by an orbital Hall effect. Using general symmetry arguments, we establish a connection between the two phenomena with potential implications for orbitronics and spin-orbitronics.
*We acknowledge CNPq/Brazil, CAPES/Brazil, FAPERJ/Brazil and INCT Nanocarbono for financial support. TGR acknowledges funding from Fundação para a Ciência e a Tecnologia and Instituto de Telecomunicações - grant number UID/50008/2020 in the framework of the project Sym-Break. MC acknowledge the National Laboratory for Scientific Computing (LNCC/MCTI, Brazil) for providing HPC resources of the SDumont supercomputer. B.F. acknowledges funding from FAPESP/Brazil under grant no. 2019/04527-0 and the Brazilian Nanotechnology National Laboratory (LNNano/CNPEM, Brazil) for computational resources. A.F. acknowledges funding from FAPESP/Brazil under grant no. 2017/02317-2. L.M.C. acknowledges funding from Ministerio de Ciencia e Innovación de Espa~na under grant No. PID2019-106684GB-I00 / AEI / 10.13039/501100011033. ICN2 is funded by the CERCA Programme/Generalitat de Catalunya and supported by the Severo Ochoa Centres of Excellence program, funded by the Spanish Research Agency (Grant No. SEV-2017-0706)
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