QUANTUM WELL LUMINESCENCE FROM METALLIC MONOLAYERS

2002 ◽  
Vol 01 (01) ◽  
pp. 53-62 ◽  
Author(s):  
GERMAR HOFFMANN ◽  
RICHARD BERNDT
Keyword(s):  
Quantum Well ◽  
Light Emission ◽  
Interband Transition ◽  
Spectral Feature ◽  
The Other ◽  
Scanning Tunnelling Microscope ◽  
Unoccupied State ◽  
Scanning Tunnelling ◽  
Quantum Well States ◽  
Clean Metal

The emission of visible light is observed from the metallic quantum well system Na on Cu(111) when electrons tunnel from the tip of a scanning tunnelling microscope to an unoccupied state of the sample. Spectral analysis of the emission along with tunnelling spectroscopy is used to show that the emission is comprised of two components. A sharp spectral feature is found to be due to an interband transition between quantum well states of the Na layer. The other component is similar to plasmon-mediated emission observed previously from clean metal surfaces. The results suggest that light emission is a unique local probe of the electronic structure of quantum well systems.

The mechanism of light emission from a scanning tunnelling microscope operating in air

2016 ◽  
Vol 27 (46) ◽  
pp. 465201 ◽  
Author(s):  
B Rogez ◽  
S Cao ◽  
G Dujardin ◽  
G Comtet ◽  
E Le Moal ◽  
...  
Keyword(s):  
Light Emission ◽  
Scanning Tunnelling Microscope ◽  
Scanning Tunnelling

Influence of tip geometry in light emission from the scanning tunnelling microscope

2001 ◽  
Vol 482-485 ◽  
pp. 1159-1162 ◽  
Author(s):  
G. Hoffmann ◽  
J. Aizpurua ◽  
P. Apell ◽  
R. Berndt
Keyword(s):  
Light Emission ◽  
Scanning Tunnelling Microscope ◽  
Scanning Tunnelling

An improved design for an Scanning Tunnelling Microscope (STM) for use in a Transmission Electron Microscope (TEM)

1991 ◽  
Vol 49 ◽  
pp. 384-385
Author(s):  
W.K. Lo ◽  
J.C.H. Spence
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Mechanical Stability ◽  
Scanning Tunnelling Microscope ◽  
Reflection Mode ◽  
Specimen Holder ◽  
Transmission Electron ◽  
Scanning Tunnelling ◽  
Improved Design

An improved design for a combination Scanning Tunnelling Microscope/TEM specimen holder is presented. It is based on earlier versions which have been used to test the usefulness of such a device. As with the earlier versions, this holder is meant to replace the standard double-tilt specimen holder of an unmodified Philips 400T TEM. It allows the sample to be imaged simultaneously by both the STM and the TEM when the TEM is operated in the reflection mode (see figure 1).The resolution of a STM is determined by its tip radii as well as its stability. This places strict limitations on the mechanical stability of the tip with respect to the sample. In this STM the piezoelectric tube scanner is rigidly mounted inside the endcap of the STM holder. The tip coarse approach to the sample (z-direction) is provided by an Inchworm which is located outside the TEM vacuum.

Quantum Well States in Metallic Superlattices

1996 ◽  
Vol 6 (11) ◽  
pp. 1461-1467 ◽  
Author(s):  
C. Sommers ◽  
P. M. Levy
Keyword(s):  
Quantum Well ◽  
Quantum Well States

On-Surface Radical Oligomerisation: A New Approach to STM Tip-Induced Reactions

2018 ◽  
Author(s):  
Gaolei Zhan ◽  
Younes Makoudi ◽  
Judicael Jeannoutot ◽  
Simon Lamare ◽  
Michel Féron ◽  
...  
Keyword(s):  
Sample Surface ◽  
Scanning Tunnelling Microscope ◽  
Transfer Event ◽  
New Approach ◽  
The Past ◽  
Organic Nanostructures ◽  
Scanning Tunnelling ◽  
New Strategy ◽  
Surface Fabrication ◽  
And Control

Over the past decade, on-surface fabrication of organic nanostructures has been widely investigated for the development of molecular electronic devices, nanomachines, and new materials. Here, we introduce a new strategy to obtain alkyl oligomers in a controlled manner using on-surface radical oligomerisations that are triggered by the electrons/holes between the sample surface and the tip of a scanning tunnelling microscope. The resulting radical-mediated mechanism is substantiated by a detailed theoretical study. This electron transfer event only occurs when <i>V</i><sub>s</sub> < -3 V or <i>V</i><sub>s</sub> > + 3 V and allows access to reactive radical species under exceptionally mild conditions. This transfer can effectively ‘switch on’ a sequence leading to formation of oligomers of defined size distribution due to the on-surface confinement of reactive species. Our approach enables new ways to initiate and control radical oligomerisations with tunnelling electrons, leading to molecularly precise nanofabrication.

scholarly journals Erratum: Observation of monolayer valence band spin-orbit effect and induced quantum well states in MoX2

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Nasser Alidoust ◽  
Guang Bian ◽  
Su-Yang Xu ◽  
Raman Sankar ◽  
Madhab Neupane ◽  
...  
Keyword(s):  
Quantum Well ◽  
Valence Band ◽  
Spin Orbit ◽  
Quantum Well States

Single-charge transport through hybrid core–shell Au-ZnS quantum dots: a comprehensive analysis from a modified energy structure

Nanoscale ◽  
2021 ◽  
Author(s):  
Tuhin Shuvra Basu ◽  
Simon Diesch ◽  
Ryoma Hayakawa ◽  
Yutaka Wakayama ◽  
Elke Scheer
Keyword(s):  
Quantum Dots ◽  
Electronic Structure ◽  
Carrier Transport ◽  
Comprehensive Analysis ◽  
Energy Structure ◽  
Core Shell ◽  
Single Charge ◽  
Scanning Tunnelling Microscope ◽  
Single Carrier ◽  
Scanning Tunnelling

We examined the modified electronic structure and single-carrier transport of individual hybrid core–shell metal–semiconductor Au-ZnS quantum dots using a scanning tunnelling microscope.

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