Quantum degeneracy in atomic point contacts revealed by chemical force and conductance

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F13%3A00399566" target="_blank" >RIV/68378271:_____/13:00399566 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevLett.111.106803" target="_blank" >http://dx.doi.org/10.1103/PhysRevLett.111.106803</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevLett.111.106803" target="_blank" >10.1103/PhysRevLett.111.106803</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Quantum degeneracy in atomic point contacts revealed by chemical force and conductance

Popis výsledku v původním jazyce

Quantum degeneracy is an important concept in quantum mechanics with large implications to many processes in condensed matter. We show the consequences of electron energy level degeneracy on the conductance and the chemical force between two bodies at the atomic scale. We propose a novel way in which a scanning probe microscope can detect the presence of degenerate states in atomic-sized contacts even at room temperature. The tunneling conductance G and chemical binding force F between two bodies both tend to decay exponentially with distance in a certain distance range, usually maintaining direct proportionality to each other. However, we show that a square relation, G proportional to F squared, arises as a consequence of quantum degeneracy between the interacting frontier states of the scanning tip and a surface atom. We demonstrate this phenomenon on the Si(111)-(77) surface reconstruction.

Název v anglickém jazyce

Quantum degeneracy in atomic point contacts revealed by chemical force and conductance

Popis výsledku anglicky

Quantum degeneracy is an important concept in quantum mechanics with large implications to many processes in condensed matter. We show the consequences of electron energy level degeneracy on the conductance and the chemical force between two bodies at the atomic scale. We propose a novel way in which a scanning probe microscope can detect the presence of degenerate states in atomic-sized contacts even at room temperature. The tunneling conductance G and chemical binding force F between two bodies both tend to decay exponentially with distance in a certain distance range, usually maintaining direct proportionality to each other. However, we show that a square relation, G proportional to F squared, arises as a consequence of quantum degeneracy between the interacting frontier states of the scanning tip and a surface atom. We demonstrate this phenomenon on the Si(111)-(77) surface reconstruction.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/GPP204%2F11%2FP578" target="_blank" >GPP204/11/P578: Ab-initio výpočty pro interpretaci mikroskopie s rastrující sondou</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review Letters

ISSN

0031-9007

e-ISSN

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Svazek periodika

111

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

"106803-1"-"106803-5"

Kód UT WoS článku

000324232600022

EID výsledku v databázi Scopus

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