Angle resolved photoemission spectroscopy reveals spin charge separation in metallic MoSe2grain boundary.
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 MoSe2exhibit 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.
Department of Physics, University of South Florida, Tampa, Florida 33620, USA.
Yujing
Y
Ma
Department of Physics, University of South Florida, Tampa, Florida 33620, USA.
Horacio Coy
HC
Diaz
Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin-BP 48, Gif sur Yvette Cedex 91192, France.|Université Paris-Saclay, L'Orme des Merisiers, Saint Aubin-BP 48, Gif sur Yvette Cedex 91192, France.
José
J
Avila
Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin-BP 48, Gif sur Yvette Cedex 91192, France.|Université Paris-Saclay, L'Orme des Merisiers, Saint Aubin-BP 48, Gif sur Yvette Cedex 91192, France.
Chaoyu
C
Chen
Department of Physics, University of South Florida, Tampa, Florida 33620, USA.
Vijaysankar
V
Kalappattil
Department of Physics, University of South Florida, Tampa, Florida 33620, USA.
Raja
R
Das
Department of Physics, University of South Florida, Tampa, Florida 33620, USA.
Manh-Huong
MH
Phan
Beijing Computational Science Research Center, Beijing 100193, China.|Center of Physics of University of Minho and University of Porto, Oporto P-4169-007, Portugal.
Tilen
T
Čadež
Beijing Computational Science Research Center, Beijing 100193, China.|Center of Physics of University of Minho and University of Porto, Oporto P-4169-007, Portugal.|Department of Physics, University of Minho, Campus Gualtar, Braga P-4710-057, Portugal.
José M P
JM
Carmelo
Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin-BP 48, Gif sur Yvette Cedex 91192, France.|Université Paris-Saclay, L'Orme des Merisiers, Saint Aubin-BP 48, Gif sur Yvette Cedex 91192, France.
Maria C
MC
Asensio
Department of Physics, University of South Florida, Tampa, Florida 33620, USA.
Matthias
M
Batzill
D004583:Electrons; D016252:Microscopy, Scanning Tunneling; D008962:Models, Theoretical; D008982:Molybdenum / Q000737:chemistry; D056951:Photoelectron Spectroscopy; D012643:Selenium / Q000737:chemistry; D012666:Semiconductors
D008982:Molybdenum; D012643:Selenium