Transition from tunneling to direct contact in tungsten nanojunctions

A. Halbritter, S. Csonka, G. Mihály, E. Jurdik, Y. Kolesnychenko, I. Shklyarevskii, S. Speller, H. Van Kempen

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We apply the mechanically controllable break junctions technique to investigate the transition from tunneling to direct contact in tungsten. This transition is quite different from that of other metals and is determined by the local electronic properties of the tungsten surface and the relief of the electrodes at the point of their closest proximity. When flat surfaces approach each other, an avalanchelike jump to direct contact occurs at anomalously large distances z≈3–5 Å. In contrast, ballistic contact between irregularly shaped electrodes is established without discontinuity in conductance curves, indicating the absence of spontaneous formation of an adhesive neck. Conductance histograms of tungsten are either featureless or show two distinct peaks related to the sequential opening of spatially separated groups of conductance channels. The role of surface states of tungsten and their contribution to the junction conductance at sub-Å electrode separations are discussed.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number12
DOIs
Publication statusPublished - Jul 15 2003

Fingerprint

Tungsten
tungsten
Electrodes
electrodes
Surface states
Ballistics
histograms
Electronic properties
adhesives
ballistics
proximity
flat surfaces
Adhesives
discontinuity
Metals
curves
electronics
metals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Transition from tunneling to direct contact in tungsten nanojunctions. / Halbritter, A.; Csonka, S.; Mihály, G.; Jurdik, E.; Kolesnychenko, Y.; Shklyarevskii, I.; Speller, S.; Van Kempen, H.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 68, No. 12, 15.07.2003.

Research output: Contribution to journalArticle

Halbritter, A. ; Csonka, S. ; Mihály, G. ; Jurdik, E. ; Kolesnychenko, Y. ; Shklyarevskii, I. ; Speller, S. ; Van Kempen, H. / Transition from tunneling to direct contact in tungsten nanojunctions. In: Physical Review B - Condensed Matter and Materials Physics. 2003 ; Vol. 68, No. 12.
@article{179cb5eb271d4bd2a8606731e8d836dd,
title = "Transition from tunneling to direct contact in tungsten nanojunctions",
abstract = "We apply the mechanically controllable break junctions technique to investigate the transition from tunneling to direct contact in tungsten. This transition is quite different from that of other metals and is determined by the local electronic properties of the tungsten surface and the relief of the electrodes at the point of their closest proximity. When flat surfaces approach each other, an avalanchelike jump to direct contact occurs at anomalously large distances z≈3–5 {\AA}. In contrast, ballistic contact between irregularly shaped electrodes is established without discontinuity in conductance curves, indicating the absence of spontaneous formation of an adhesive neck. Conductance histograms of tungsten are either featureless or show two distinct peaks related to the sequential opening of spatially separated groups of conductance channels. The role of surface states of tungsten and their contribution to the junction conductance at sub-{\AA} electrode separations are discussed.",
author = "A. Halbritter and S. Csonka and G. Mih{\'a}ly and E. Jurdik and Y. Kolesnychenko and I. Shklyarevskii and S. Speller and {Van Kempen}, H.",
year = "2003",
month = "7",
day = "15",
doi = "10.1103/PhysRevB.68.035417",
language = "English",
volume = "68",
journal = "Physical Review B-Condensed Matter",
issn = "0163-1829",
publisher = "American Physical Society",
number = "12",

}

TY - JOUR

T1 - Transition from tunneling to direct contact in tungsten nanojunctions

AU - Halbritter, A.

AU - Csonka, S.

AU - Mihály, G.

AU - Jurdik, E.

AU - Kolesnychenko, Y.

AU - Shklyarevskii, I.

AU - Speller, S.

AU - Van Kempen, H.

PY - 2003/7/15

Y1 - 2003/7/15

N2 - We apply the mechanically controllable break junctions technique to investigate the transition from tunneling to direct contact in tungsten. This transition is quite different from that of other metals and is determined by the local electronic properties of the tungsten surface and the relief of the electrodes at the point of their closest proximity. When flat surfaces approach each other, an avalanchelike jump to direct contact occurs at anomalously large distances z≈3–5 Å. In contrast, ballistic contact between irregularly shaped electrodes is established without discontinuity in conductance curves, indicating the absence of spontaneous formation of an adhesive neck. Conductance histograms of tungsten are either featureless or show two distinct peaks related to the sequential opening of spatially separated groups of conductance channels. The role of surface states of tungsten and their contribution to the junction conductance at sub-Å electrode separations are discussed.

AB - We apply the mechanically controllable break junctions technique to investigate the transition from tunneling to direct contact in tungsten. This transition is quite different from that of other metals and is determined by the local electronic properties of the tungsten surface and the relief of the electrodes at the point of their closest proximity. When flat surfaces approach each other, an avalanchelike jump to direct contact occurs at anomalously large distances z≈3–5 Å. In contrast, ballistic contact between irregularly shaped electrodes is established without discontinuity in conductance curves, indicating the absence of spontaneous formation of an adhesive neck. Conductance histograms of tungsten are either featureless or show two distinct peaks related to the sequential opening of spatially separated groups of conductance channels. The role of surface states of tungsten and their contribution to the junction conductance at sub-Å electrode separations are discussed.

UR - http://www.scopus.com/inward/record.url?scp=85038983698&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85038983698&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.68.035417

DO - 10.1103/PhysRevB.68.035417

M3 - Article

VL - 68

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 0163-1829

IS - 12

ER -