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Title: Laser Alignment as a Route to Ultrafast Control of Electron Transport through Junctions

Abstract

We consider the extension of ultrafast laser alignment schemes to surface-adsorbed molecules, where the laser field coerces the molecule to reorient itself relative to the surface. When probed by a scanning tunneling microscope tip, this reorientation modifies the tip-molecule distance, and thus the tunneling current, suggesting a route to an ultrafast, nanoscale current switch. In addition to exploring the controllability of adsorbed molecules by moderately intense laser fields and discussing the fundamental differences of alignment behavior between surface-adsorbed molecules and gas phase molecules, we computationally investigate the quality of orientation with respect to field intensity, field duration, and the location of the tip. Overall, the molecule moves directly to its oriented configuration, which is reasonably insensitive to the tip location. These results collectively suggest the efficacy of using laser alignment schemes to control electron transport through junctions.

Authors:
 [1];  [2];  [2]
  1. ORNL
  2. Northwestern University, Evanston
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Center for Nanophase Materials Sciences
Sponsoring Org.:
USDOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1047032
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 86; Journal Issue: 1; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALIGNMENT; CONFIGURATION; ELECTRONS; LASERS; MICROSCOPES; ORIENTATION; TRANSPORT; TUNNELING

Citation Formats

Reuter, Matthew G, Ratner, Mark A., and Seideman, Tamar. Laser Alignment as a Route to Ultrafast Control of Electron Transport through Junctions. United States: N. p., 2012. Web. doi:10.1103/PhysRevA.86.013426.
Reuter, Matthew G, Ratner, Mark A., & Seideman, Tamar. Laser Alignment as a Route to Ultrafast Control of Electron Transport through Junctions. United States. https://doi.org/10.1103/PhysRevA.86.013426
Reuter, Matthew G, Ratner, Mark A., and Seideman, Tamar. Sun . "Laser Alignment as a Route to Ultrafast Control of Electron Transport through Junctions". United States. https://doi.org/10.1103/PhysRevA.86.013426.
@article{osti_1047032,
title = {Laser Alignment as a Route to Ultrafast Control of Electron Transport through Junctions},
author = {Reuter, Matthew G and Ratner, Mark A. and Seideman, Tamar},
abstractNote = {We consider the extension of ultrafast laser alignment schemes to surface-adsorbed molecules, where the laser field coerces the molecule to reorient itself relative to the surface. When probed by a scanning tunneling microscope tip, this reorientation modifies the tip-molecule distance, and thus the tunneling current, suggesting a route to an ultrafast, nanoscale current switch. In addition to exploring the controllability of adsorbed molecules by moderately intense laser fields and discussing the fundamental differences of alignment behavior between surface-adsorbed molecules and gas phase molecules, we computationally investigate the quality of orientation with respect to field intensity, field duration, and the location of the tip. Overall, the molecule moves directly to its oriented configuration, which is reasonably insensitive to the tip location. These results collectively suggest the efficacy of using laser alignment schemes to control electron transport through junctions.},
doi = {10.1103/PhysRevA.86.013426},
url = {https://www.osti.gov/biblio/1047032}, journal = {Physical Review. A},
issn = {1050-2947},
number = 1,
volume = 86,
place = {United States},
year = {2012},
month = {1}
}

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