Interlayer Coupling and its Relation to Growth and Structure

1993 ◽  
pp. 87-100 ◽  
Author(s):  
P. A. Grünberg ◽  
A. Fuss ◽  
Q. Leng ◽  
R. Schreiber ◽  
J. A. Wolf
Keyword(s):  
Interlayer Coupling

scholarly journals Cobalt-based magnetic Weyl semimetals with high-thermodynamic stabilities

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Wei Luo ◽  
Yuma Nakamura ◽  
Jinseon Park ◽  
Mina Yoon
Keyword(s):  
Tight Binding ◽  
Three Dimensional ◽  
Interlayer Coupling ◽  
First Principles Calculation ◽  
Optimization Approach ◽  
Binding Model ◽  
Nodal Lines ◽  
Weyl Semimetal ◽  
Topological Quantum ◽  
First Time

AbstractRecent experiments identified Co3Sn2S2 as the first magnetic Weyl semimetal (MWSM). Using first-principles calculation with a global optimization approach, we explore the structural stabilities and topological electronic properties of cobalt (Co)-based shandite and alloys, Co3MM’X2 (M/M’ = Ge, Sn, Pb, X = S, Se, Te), and identify stable structures with different Weyl phases. Using a tight-binding model, for the first time, we reveal that the physical origin of the nodal lines of a Co-based shandite structure is the interlayer coupling between Co atoms in different Kagome layers, while the number of Weyl points and their types are mainly governed by the interaction between Co and the metal atoms, Sn, Ge, and Pb. The Co3SnPbS2 alloy exhibits two distinguished topological phases, depending on the relative positions of the Sn and Pb atoms: a three-dimensional quantum anomalous Hall metal, and a MWSM phase with anomalous Hall conductivity (~1290 Ω−1 cm−1) that is larger than that of Co2Sn2S2. Our work reveals the physical mechanism of the origination of Weyl fermions in Co-based shandite structures and proposes topological quantum states with high thermal stability.

scholarly journals Giant Photoluminescence Enhancement and Carrier Dynamics in MoS2 Bilayers with Anomalous Interlayer Coupling

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1994
Author(s):  
Han Li ◽  
Yating Ma ◽  
Zhongjie Xu ◽  
Xiang’ai Cheng ◽  
Tian Jiang
Keyword(s):  
Optical Properties ◽  
Transition Metal Dichalcogenides ◽  
Interlayer Coupling ◽  
Carrier Dynamics ◽  
Probe Signal ◽  
Exciton Resonance ◽  
Pump Probe ◽  
Metal Dichalcogenides ◽  
Photoluminescence Enhancement ◽  
Probe Measurements

Fundamental researches and explorations based on transition metal dichalcogenides (TMDCs) mainly focus on their monolayer counterparts, where optical densities are limited owing to the atomic monolayer thickness. Photoluminescence (PL) yield in bilayer TMDCs is much suppressed owing to indirect-bandgap properties. Here, optical properties are explored in artificially twisted bilayers of molybdenum disulfide (MoS2). Anomalous interlayer coupling and resultant giant PL enhancement are firstly observed in MoS2 bilayers, related to the suspension of the top layer material and independent of twisted angle. Moreover, carrier dynamics in MoS2 bilayers with anomalous interlayer coupling are revealed with pump-probe measurements, and the secondary rising behavior in pump-probe signal of B-exciton resonance, originating from valley depolarization of A-exciton, is firstly reported and discussed in this work. These results lay the groundwork for future advancement and applications beyond TMDCs monolayers.

Modification of the Interlayer Coupling and Chemical Reactivity of Multilayer Graphene through Wrinkle Engineering

2021 ◽  
Vol 33 (7) ◽  
pp. 2506-2515
Author(s):  
Xinyu Huang ◽  
Wen Zhao ◽  
Chongyang Zhu ◽  
Xianjue Chen ◽  
Xu Han ◽  
...  
Keyword(s):  
Chemical Reactivity ◽  
Interlayer Coupling ◽  
Multilayer Graphene

Stacking angle dependent multiple excitonic resonances in bilayer tungsten diselenide

Nanophotonics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 3881-3887
Author(s):  
Ankit Arora ◽  
Pramoda K. Nayak ◽  
Tejendra Dixit ◽  
Kolla Lakshmi Ganapathi ◽  
Ananth Krishnan ◽  
...  
Keyword(s):  
Chemical Vapour ◽  
Optoelectronic Devices ◽  
Interlayer Coupling ◽  
Higher Order ◽  
Doping Effect ◽  
Many Body ◽  
Si Substrate ◽  
Tungsten Diselenide ◽  
Body Dynamics ◽  
Insight Into

AbstractWe report on multiple excitonic resonances in bilayer tungsten diselenide (BL-WSe2) stacked at different angles and demonstrate the use of the stacking angle to control the occurrence of these excitations. BL-WSe2 with different stacking angles were fabricated by stacking chemical vapour deposited monolayers and analysed using photoluminescence measurements in the temperature range 300–100 K. At reduced temperatures, several excitonic features were observed and the occurrences of these exitonic resonances were found to be stacking angle dependent. Our results indicate that by controlling the stacking angle, it is possible to excite or quench higher order excitations to tune the excitonic flux in optoelectronic devices. We attribute the presence/absence of multiple higher order excitons to the strength of interlayer coupling and doping effect from SiO2/Si substrate. Understanding interlayer excitations will help in engineering excitonic devices and give an insight into the physics of many-body dynamics.

scholarly journals Imaging of Interlayer Coupling in van der Waals Heterostructures Using a Bright-Field Optical Microscope

Nano Letters ◽  
2017 ◽  
Vol 17 (9) ◽  
pp. 5342-5349 ◽  
Author(s):  
Evgeny M. Alexeev ◽  
Alessandro Catanzaro ◽  
Oleksandr V. Skrypka ◽  
Pramoda K. Nayak ◽  
Seongjoon Ahn ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Interlayer Coupling ◽  
Optical Microscope ◽  
Bright Field ◽  
Van Der Waals Heterostructures

Interlayer coupling and superconducting properties of the triple-layer compoundB0.6C0.4(Sr0.25Ba0.75)2Ca2Cu3O9

1998 ◽  
Vol 57 (14) ◽  
pp. 8667-8670 ◽  
Author(s):  
Mun-Seog Kim ◽  
Sung-Ik Lee ◽  
A. Iyo ◽  
K. Tokiwa ◽  
M. Tokumoto ◽  
...  
Keyword(s):  
Interlayer Coupling ◽  
Superconducting Properties ◽  
Triple Layer
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