Angle resolved photoemission spectroscopy reveals spin charge separation in metallic MoSe2 grain boundary

Yujing Ma, Horacio Coy Diaz, José Avila, Chaoyu Chen, Vijaysankar Kalappattil, Raja Das, Manh-Huong Phan, Tilen Čadež, José M. P. Carmelo (), Maria C. Asensio () and Matthias Batzill ()
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Yujing Ma: University of South Florida
Horacio Coy Diaz: University of South Florida
José Avila: Synchrotron SOLEIL, L'Orme des Merisiers
Chaoyu Chen: Synchrotron SOLEIL, L'Orme des Merisiers
Vijaysankar Kalappattil: University of South Florida
Raja Das: University of South Florida
Manh-Huong Phan: University of South Florida
Tilen Čadež: Beijing Computational Science Research Center
José M. P. Carmelo: Beijing Computational Science Research Center
Maria C. Asensio: Synchrotron SOLEIL, L'Orme des Merisiers
Matthias Batzill: University of South Florida

Nature Communications, 2017, vol. 8, issue 1, 1-12

Abstract: Abstract Material line defects are one-dimensional structures but the search and proof of electron behaviour consistent with the reduced dimension of such defects has been so far unsuccessful. Here we show using angle resolved photoemission spectroscopy that twin-grain boundaries in the layered semiconductor MoSe2 exhibit parabolic metallic bands. The one-dimensional nature is evident from a charge density wave transition, whose periodicity is given by kF/π, consistent with scanning tunnelling microscopy and angle resolved photoemission measurements. Most importantly, we provide evidence for spin- and charge-separation, the hallmark of one-dimensional quantum liquids. Our studies show that the spectral line splits into distinctive spinon and holon excitations whose dispersions exactly follow the energy-momentum dependence calculated by a Hubbard model with suitable finite-range interactions. Our results also imply that quantum wires and junctions can be isolated in line defects of other transition metal dichalcogenides, which may enable quantum transport measurements and devices.

Date: 2017
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DOI: 10.1038/ncomms14231

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