Speaker
Dr
Zurab Guguchia
(Department of Physics, Columbia University, New York, NY 10027, USA and Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.)
Description
We report the discovery of magnetic order in bulk semiconducting transition metal dichalcogenides (TMDs) 2H-MoTe2 and 2H-MoSe2 [1]. The muon spin rotation (muSR) measurements show the presence of long-range magnetic order in both compounds. DFT calculations show that this magnetism is promoted by the presence of defects in the crystal. The STM measurements show that the vast majority of defects in these materials are metal vacancies and chalcogen-metal antisites. DFT indicates that the antisite defects are magnetic with a magnetic moment in the range of 0.9 to 2.8 muB. These observations establish 2H-MoTe2 and 2H-MoSe2 as a new class of magnetic semiconductors.
[1] Z. Guguchia et. al., Science Advances 4, eaat3672 (2018).
Authors
Dr
Zurab Guguchia
(Department of Physics, Columbia University, New York, NY 10027, USA and Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.)
Mr
Alex Kerelsky
(Department of Physics, Columbia University, New York, NY 10027, USA)
Mr
Drew Edelberg
(Department of Physics, Columbia University, New York, NY 10027, USA)
Mr
Soham Banerjee
(Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA)
Dr
Fabian Von Rohr
(Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland)
Mr
Declan Scullion
(School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK)
Mr
Mathias Augustin
(School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK)
Mr
M Scully
(School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK)
Dr
Daniel A Rhodes
(Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA)
Dr
Zurab Shermadini
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland)
Dr
Hubertus Luetkens
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland)
Prof.
Alexander Shengelaya
(Department of Physics, Tbilisi State University, Chavchavadze 3, GE-0128 Tbilisi, Georgia)
Dr
Chris Baines
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland)
Prof.
Elvezio Morenzoni
(2 Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland)
Dr
Alex Amato
(2 Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland)
Prof.
James C Hone
(6 Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA)
Dr
Rustem Khasanov
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland)
Prof.
Simon JL Billinge
(Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA)
Dr
Elton Santos
(School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK)
Prof.
Abhay N Pasupathy
(Department of Physics, Columbia University, New York, NY 10027, USA)
Prof.
Yasutomo Uemura
(Department of Physics, Columbia University, New York, NY 10027, USA)
