Strong One-Dimensional Characteristics of Hole-Carriers in ReS2 and ReSe2

Scientific Reports
B S KimS R Park

Abstract

Each plane of layered ReS2 and ReSe2 materials has 1D chain structure, from which intriguing properties such as 1D character of the exciton states and linearly polarized photoluminescence originate. However, systematic studies on the 1D character of charge carriers have not been done yet. Here, we report on systematic and comparative studies on the energy-momentum dispersion relationships of layered transition metal dichalcogenides ReS2 and ReSe2 by angle resolved photoemission. We found that the valence band maximum or the minimum energy for holes is located at the high symmetric Z-point for both materials. However, the out-of-plane ([Formula: see text]) dispersion for ReSe2 (20 meV) is found to be much smaller than that of ReS2 (150 meV). We observe that the effective mass of the hole carriers along the direction perpendicular to the chain is about 4 times larger than that along the chain direction for both ReS2 and ReSe2. Remarkably, the experimentally measured hole effective mass is about twice heavier than that from first principles calculation for ReS2 although the in-plane anisotropy values from the experiment and calculations are comparable. These observation indicate that bulk ReS2 and ReSe2 are unique semiconducting t...Continue Reading

References

Mar 21, 2013·Nature Chemistry·Manish ChhowallaHua Zhang
Feb 7, 2014·Nature Communications·Sefaattin TongayJunqiao Wu
May 16, 2014·Chemical Society Reviews·Pere MiróThomas Heine
Nov 20, 2016·Nature Communications·Sangwan SimHyunyong Choi
Apr 18, 2017·Nano Letters·Ashish AroraRudolf Bratschitsch
Aug 2, 2017·Nano Letters·Mathias GehlmannClaus M Schneider
Jan 26, 2018·Nature Communications·Sangwan SimHyunyong Choi
Aug 15, 2018·Nature Nanotechnology·Pasqual RiveraXiaodong Xu
Nov 7, 2018·Nature Nanotechnology·Chenhao JinTony F Heinz

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Methods Mentioned

BETA
transmission
electron diffraction
X-ray

Software Mentioned

ARPES

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