Finite-length charge-density waves on terminated atomic wires

Finite-size effects in charge-density waves (CDWs) were unveiled using scanning tunneling microscopy for metallic atomic wires on the Au/Si(553) surface, as terminated by adsorbate impurities. We found that CDW formed at low temperature adopts the finite-length boundary condition in two distinct way...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-02, Vol.85 (7), Article 073401
Main Authors: Shin, Jin Sung, Ryang, Kyung-Deuk, Yeom, Han Woong
Format: Article
Language:English
Subjects:
Antiphase boundaries
Boundary conditions
Condensed matter
Decay
Fluctuation
Stopping
Wavelengths
Wire
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Summary:Finite-size effects in charge-density waves (CDWs) were unveiled using scanning tunneling microscopy for metallic atomic wires on the Au/Si(553) surface, as terminated by adsorbate impurities. We found that CDW formed at low temperature adopts the finite-length boundary condition in two distinct ways, depending on the length scale. For longer wires than ~10 nm, the CDW correlation length, the decay length of the CDW amplitude from the terminating ends, scales continuously with the wire length as predicted in a recent hyperscaling theory [Phys. Rev. B 75, 205428 (2007) (http://dx.doi.org/10.1103/PhysRevB.75.205428)]. For shorter wires, the boundary condition becomes discrete with respect to the CDW wavelength of 3a sub(0). For incommensurate wire lengths with 3a sub(0), fluctuating CDW states were observed, which are due to the motion of solitonlike antiphase boundaries.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.85.073401