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TitleAngle resolved photoemission spectroscopy reveals spin charge separation in metallic MoSe2 grain boundary
Author(s)Ma, Yujing
Coy Diaz, Horacio
Avila, José
Chen, Chaoyu
Kalappattil, Vijaysankar
Das, Raja
Phan, Manh-Huong
Cadez, Tilen
Carmelo, José Manuel Pereira
Asensio, Maria C.
Batzill, Matthias
Issue date6-Feb-2017
PublisherNature Publishing Group
JournalNature Communications
CitationNature Communications 8, 14 231-14 242 (2017).
Abstract(s)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/p, 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.
Publisher versionThe original publication is available at
AccessOpen access
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)

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