Defects in WSe2 investigated by Quasi-Particle Interference mapping and STM/STS

Research output: Contribution to conferenceOther

Abstract

Defects in transition metal dichalcogenides (TMDs) are local atomic modifications which can affect the electronic and magnetic properties of the material. Here we focus on WSe2 which is one of the semiconducting TMDs and has great potential in both spintronics and valleytronics. We studied natural defects in WSe2 crystals and monolayers by scanning tunnelling microscopy and spectroscopy (STM/STS), coupled with quasiparticle interference (QPI) mapping, at 4K and 77K. Among a large variety of defect configurations, we identified a few that based on QPI appear to support spin-flip processes. We have also studied monolayers of WSe2 on atomically flat metallic surfaces and used QPI to characterise their interaction and defect behaviour.
Original languageEnglish
Publication statusPublished - 12 Jul 2018
EventConference on Physics of Defects in Solids: Quantum Mechanics Meets Topology - International Centre for Theoretical Physics, Trieste, Italy
Duration: 9 Jul 201813 Jul 2018
Conference number: smr 3221
http://indico.ictp.it/event/8321/overview

Conference

ConferenceConference on Physics of Defects in Solids: Quantum Mechanics Meets Topology
CountryItaly
CityTrieste
Period9/07/1813/07/18
Internet address

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elementary excitations
scanning tunneling microscopy
interference
defects
spectroscopy
transition metals
magnetic properties
configurations
electronics
crystals
interactions

Cite this

Edmonds, M., & Ilie, A. (2018). Defects in WSe2 investigated by Quasi-Particle Interference mapping and STM/STS. Conference on Physics of Defects in Solids: Quantum Mechanics Meets Topology, Trieste, Italy.

Defects in WSe2 investigated by Quasi-Particle Interference mapping and STM/STS. / Edmonds, Matthew; Ilie, Adelina.

2018. Conference on Physics of Defects in Solids: Quantum Mechanics Meets Topology, Trieste, Italy.

Research output: Contribution to conferenceOther

Edmonds, M & Ilie, A 2018, 'Defects in WSe2 investigated by Quasi-Particle Interference mapping and STM/STS' Conference on Physics of Defects in Solids: Quantum Mechanics Meets Topology, Trieste, Italy, 9/07/18 - 13/07/18, .
Edmonds M, Ilie A. Defects in WSe2 investigated by Quasi-Particle Interference mapping and STM/STS. 2018. Conference on Physics of Defects in Solids: Quantum Mechanics Meets Topology, Trieste, Italy.
Edmonds, Matthew ; Ilie, Adelina. / Defects in WSe2 investigated by Quasi-Particle Interference mapping and STM/STS. Conference on Physics of Defects in Solids: Quantum Mechanics Meets Topology, Trieste, Italy.
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AB - Defects in transition metal dichalcogenides (TMDs) are local atomic modifications which can affect the electronic and magnetic properties of the material. Here we focus on WSe2 which is one of the semiconducting TMDs and has great potential in both spintronics and valleytronics. We studied natural defects in WSe2 crystals and monolayers by scanning tunnelling microscopy and spectroscopy (STM/STS), coupled with quasiparticle interference (QPI) mapping, at 4K and 77K. Among a large variety of defect configurations, we identified a few that based on QPI appear to support spin-flip processes. We have also studied monolayers of WSe2 on atomically flat metallic surfaces and used QPI to characterise their interaction and defect behaviour.

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