CMSP Seminar (Atomistic Simulation Webinar Series): Wednesday 20 May 2020 at 11am

ICTP/CM cm at
Mon May 18 09:37:59 CEST 2020

CMSP Seminar
Atomistic Simulation Webinar Series

When:**Wednesday 20 May at 11 a.m.
Where:**Join Zoom ID Meeting 755-540-399

Speaker: Roberto Flammini (ISM-CNR, Roma)

Title: A Study of the Atomic and Electronic Structure of the Anitmonene/bismuth
Selenide Interface: In Search of Proximity Effects

Full Abstract:

In this talk I will present our recent experimental results on the 
antimonene/bismuth selenide interface. We performed STM at the CNR-Tor 
Vergata in Rome and ARPES at the VUV beamline at ELETTRA. Scanning 
tunnelling microscopy measurements show the presence of moiré patterns 
attributed to differently oriented domains of antimonene, and areas of 
the surface in which antimonene is lattice-matched with the bismuth 
selenide substrate. The two kinds of domain are attributed to the alpha- 
and to beta-phase of antimonene. Moreover, we studied the conditions 
according to which the beta-phase can be favoured with respect to the 
alpha-antimonene phase. This discovery allowed us to perform ARPES 
measurements on one and two bilayers of beta-antimonene as single 
domains. The non-trivial band structure features the presence of a 
substantial hybridization between antimonene and bismuth selenide 
states. DFT calculations simulate almost perfectly the electronic band 
structures allowing us to infer the effects of the proximity between a 
conventional (antimonene) and a topological (bismuth selenide) insulator.


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