Experimental study of the transition from van der Waals, over covalent to metallic bonding in mercury clusters

1990 ◽  
Vol 86 (13) ◽  
pp. 2473 ◽  
Author(s):  
Hellmut Haberland ◽  
Hans Kornmeier ◽  
Helge Langosch ◽  
Michael Oschwald ◽  
Gregor Tanner
Keyword(s):  
Experimental Study ◽  
Van Der Waals ◽  
Metallic Bonding

scholarly journals Twist-angle dependence of moiré excitons in WS2/MoSe2 heterobilayers

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Long Zhang ◽  
Zhe Zhang ◽  
Fengcheng Wu ◽  
Danqing Wang ◽  
Rahul Gogna ◽  
...  
Keyword(s):  
Experimental Study ◽  
Effective Mass ◽  
Critical Parameter ◽  
Twist Angle ◽  
Van Der Waals ◽  
Reciprocal Lattice ◽  
Lattice Period ◽  
Van Der Waals Heterostructures ◽  
Angle Dependence ◽  
The Way

AbstractMoiré lattices formed in twisted van der Waals bilayers provide a unique, tunable platform to realize coupled electron or exciton lattices unavailable before. While twist angle between the bilayer has been shown to be a critical parameter in engineering the moiré potential and enabling novel phenomena in electronic moiré systems, a systematic experimental study as a function of twist angle is still missing. Here we show that not only are moiré excitons robust in bilayers of even large twist angles, but also properties of the moiré excitons are dependant on, and controllable by, the moiré reciprocal lattice period via twist-angle tuning. From the twist-angle dependence, we furthermore obtain the effective mass of the interlayer excitons and the electron inter-layer tunneling strength, which are difficult to measure experimentally otherwise. These findings pave the way for understanding and engineering rich moiré-lattice induced phenomena in angle-twisted semiconductor van der Waals heterostructures.

From van der Waals to metallic bonding: The growth of Be clusters

1990 ◽  
Vol 65 (1) ◽  
pp. 80-83 ◽  
Author(s):  
R. Kawai ◽  
J. H. Weare
Keyword(s):  
Van Der Waals ◽  
Metallic Bonding

The measurement of van der Waals dispersion forces in the range 1.5 to 130 nm

1972 ◽  
Vol 331 (1584) ◽  
pp. 19-38 ◽  
Keyword(s):  
Experimental Study ◽  
Fatty Acid ◽  
Dynamic Method ◽  
Van Der Waals ◽  
The Other ◽  
Gradual Transition ◽  
Dispersion Forces ◽  
Spring Stiffness ◽  
20 Nm ◽  
Stiff Spring

.This paper describes an experimental study of the van der Waals dispersion forces between curved mica surfaces. For separations in the range 1.4 to 20 nm the forces were determined by the jump method described in earlier work by Tabor & Winterton (1969). For larger separations the forces were determined by a new dynamic method. One surface was supported on a rigid piezo-electric crystal and could be set vibrating at very small amplitudes over a convenient range of frequencies. The other was supported, facing it, on a stiff spring: its natural frequency depended both on the spring stiffness and on the van der Waals force exerted upon its by the first surface. By determining the resonant frequency as a function of separation the law of force was deduced in the range 10 to 130 nm. Both methods thus covered the range from 1.4 to 130 nm. In this way it is shown that there is a gradual transition between non-retarded and retarded forces as the separation is increased from 12 to 50nm. Experiments have also been carried out on the influence of adsorbed fatty acid monolayers on the van der Waals interaction between mica surfaces. The results show that for separations greater than about 5 nm the forces are as for bulk mica: for separations less than 3 nm the forces are slightly less and appear to be dominated by the van der Waals properties of the monolayers themselves.

Theory for the transition from van der waals to metallic bonding in small (Mercury) clusters

1990 ◽  
Vol 24-26 (1) ◽  
pp. 371-373 ◽  
Author(s):  
G. M. Pastor ◽  
P. Stampfli ◽  
K. H. Bennemann
Keyword(s):  
Van Der Waals ◽  
Metallic Bonding

On the transition from Van der Waals- to metallic bonding in Hg-clusters as a function of cluster size

1988 ◽  
Vol 38 (4) ◽  
pp. 623-626 ◽  
Author(s):  
G M Pastor ◽  
P Stampfli ◽  
K H Bennemann
Keyword(s):  
Cluster Size ◽  
Van Der Waals ◽  
Metallic Bonding

An Experimental Study on Mixed-Dimensional 1D-2D van der Waals Single-Walled Carbon Nanotube-WSe2 Hetero-Junction

2020 ◽  
Vol 41 (4) ◽  
pp. 645-648 ◽  
Author(s):  
Sadegh Kamaei ◽  
Ali Saeidi ◽  
Farzan Jazaeri ◽  
Amin Rassekh ◽  
Nicolo Oliva ◽  
...  
Keyword(s):  
Experimental Study ◽  
Carbon Nanotube ◽  
Van Der Waals ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon

scholarly journals Experimental study of the fragmentation of van der Waals gas clusters by electron ionization

2018 ◽  
Vol 387 ◽  
pp. 012012
Author(s):  
S T Chinenov ◽  
A E Zarvin ◽  
V E Khudozhitkov ◽  
V V Kalyada ◽  
A S Yaskin
Keyword(s):  
Experimental Study ◽  
Van Der Waals ◽  
Electron Ionization ◽  
Van Der Waals Gas ◽  
Gas Clusters
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