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

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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. 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. (en)
Title	Quantum degeneracy in atomic point contacts revealed by chemical force and conductance Quantum degeneracy in atomic point contacts revealed by chemical force and conductance (en)
skos:prefLabel	Quantum degeneracy in atomic point contacts revealed by chemical force and conductance Quantum degeneracy in atomic point contacts revealed by chemical force and conductance (en)
skos:notation	RIV/68378271:_____/13:00399566!RIV14-GA0-68378271
http://linked.open...avai/predkladatel	Fyzikální ústav AV ČR, v.v.i.
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GPP204/11/P578)
http://linked.open...iv/cisloPeriodika	10
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Jelínek, Pavel Ondráček, Martin
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Fyzikální ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	101224
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/13:00399566
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	scanning tunneling microscopy; atomic force microscopy; degenerate states; silicon surface; dangling bonds (en)
http://linked.open.../riv/klicoveSlovo	silicon surface dangling bonds degenerate states scanning tunneling microscopy atomic force microscopy
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[10B17C553547]
http://linked.open...i/riv/nazevZdroje	Physical Review Letters
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	8 (xsd:int)
http://linked.open...vavai/riv/projekt	Ab-initio calculations for the interpretation of scanning-probe microscopy
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	111
http://linked.open...iv/tvurceVysledku	Jelínek, Pavel Ondráček, Martin Pou, P. Flores, F. Abe, M. Morita, S. Sugimoto, Y. Perez, R.
http://linked.open...ain/vavai/riv/wos	000324232600022
issn	0031-9007
number of pages	5 (xsd:int)
http://bibframe.org/vocab/doi	10.1103/PhysRevLett.111.106803

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