Salvador Barraza-Lopez

Postdoctoral Researcher

Department of Physics, Virginia Tech

NEWS:

02/15/2008 The paper --J. Appl. Phys. 103, 07B907 (2008)-- has been selected for the February 18, 2008 issue of the Virtual Journal of Nanoscale Science and Technology.
02/12/2007 Our work has been featured this week at the Beckman Institute's research spotlights.
01/05/2007 Our paper --J. Appl. Phys. 100, 124304 (2006)-- to appear on the January 8, 2007 issue of the Virtual Journal of Nanoscale Science and Technology.
08/01/2006 Starting postdoctoral training, with Prof. Kyungwha Park at Virginia Tech.
06/01/2006 Our tool to obtain phonon bands of carbon nanotubes is available at the NANOHUB. Here is the link.

Personal Information:

Licenciado (Bachelor in Physics), Instituto Politecnico Nacional. 2001.
PhD in Physics, University of Illinois at Urbana-Champaign. 2006.
My CV can be found here (PDF format).

Scientific Interests:

Currently working on the ab initio characterization of molecular magnets.
Thesis work in electronic transport in small molecular systems (e.g. carbon nanotubes).

We addressed the interaction of semiconducting nanotubes with relevant semiconducting surfaces. Graduate research advisor: Professor Karl Hess.
Earlier experimental work on optical tests of Bell's inequalities and classical optics at LANL in Professor P. G. Kwiat's group.

We are exploring the interaction between molecular magnets and metallic substrates.

We have fully characterized the adsorption energies, electronic structure, and atomic configuration of semiconducting single-wall carbon nanotubes (SWNTs) in the technologically-relevant Si(100) surface within density functional theory. According to our calculations, the system consisting of semiconducting SWNTs in close proximity of the semiconductor surface, shows a dramatic reduction of the semiconducting gap. More recently, the engineering possibilities added by dopant atoms and hydrogen passivation have been elucidated.

Our work on non-maximal polarization entangled states was published in Nature.

Publication List:

The interaction between a monolayer of single-molecule magnets and a metal surface.
SALVADOR BARRAZA-LOPEZ, MICHAEL C. AVERY AND KYUNGWHA PARK,
J. Appl. Phys. 103, 07B907 (2008). doi:10.1063/1.2830014. Article. Local copy (PDF).

First-principles study of a single-molecule magnet Mn12 monolayer on the Au(111) surface.
SALVADOR BARRAZA-LOPEZ, MICHAEL C. AVERY AND KYUNGWHA PARK,
Phys. Rev. B 76, 224413 (2007). doi: 10.1103/PhysRevB.76.224413. Article. Local copy.

Scanning tunnelling spectroscopy and ab initio calculations of single-walled carbon nanotubes interfaced with highly doped hydrogen-passivated Si(100) substrates.
PETER M. ALBRECHT, SALVADOR BARRAZA-LOPEZ AND JOSEPH W. LYDING,
Nanotechnology 18, 095204 (2007). doi: 10.1088/0957-4484/18/9/095204. article
For a general description of this work you can go to the research spotlight note.

Preferential orientation of a chiral semiconducting carbon nanotube on the locally depassivated Si(100)-2×1:H surface identified by scanning tunneling microscopy.
PETER M. ALBRECHT, SALVADOR BARRAZA-LOPEZ AND JOSEPH W. LYDING,
Small 3, 1402 (2007). doi: 10.1002/smll.200700070. article

High-visibility interferometric measurement of the diffraction phase.
SALVADOR BARRAZA-LOPEZ, DANIEL F. V. JAMES AND PAUL G. KWIAT,
J. Opt. Soc. Am. A 24, 1148 (2007). Article . Local copy.

Ab initio study of semiconducting carbon nanotubes adsorbed on the Si(100) surface: diameter- and registration-dependent atomic configurations and electronic properties.
SALVADOR BARRAZA-LOPEZ, PETER M. ALBRECHT, NICHOLS A. ROMERO AND KARL HESS,
J. Appl. Phys. 100, 124304 (2006). doi: 10.1063/1.2400404. Article . Local copy.

Conductance modulation of metallic carbon nanotubes by remote charged rings.
SALVADOR BARRAZA-LOPEZ, SLAVA V. ROTKIN, YAN LI AND KARL HESS,
Europhys. Lett. 69, 1003 (2005). doi: 10.1209/epl/i2004-10434-8. article

Experimental entanglement distillation and 'hidden' non-locality.
PAUL G. KWIAT, SALVADOR BARRAZA-LOPEZ, ANDRE STEFANOV AND NICOLAS GISIN,
Nature 409, 1014 (2001). doi:10.1038/35059017. article.
A general description of this work can be found here.

Citation tracking at ISI Web of Knowledge

Legal notices for local PDF files. (a) JAP articles: Copyright (2006,2008) American Institute of Physics. Articles may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. (b) The article from JOSA-A is made available as an electronic reprint with the permission of OSA.

Conference Proceedings:

Local time dependent instruction-set model for the experiment of Pan et al.
MANUEL ASCHWANDEN, WALTER PHILIPP, KARL HESS, SALVADOR BARRAZA-LOPEZ AND GUILLAUME ADENIER,
AIP Conf. Proc. 810, 437-446 (2006). article

Software Tools:

CNTphonons
Co-developed with Marcelo Kuroda and Jean-Pierre Leburton, CNTphonons calculates the phonon band structure E(k) and the corresponding density of states DOS(E) for any given carbon nanotube.

Talks Given at Meetings:

Local electrostatic mechanisms for conductance modulation in metallic carbon nanotubes
APS March Meeting, March 2004. Montreal, Canada.
(Poster) NT04, June 2004. San Luis Potosi, Mexico.
Interaction of semiconducting carbon nanotubes with the Si(100) surface
HCIS-14, July 2005. Chicago, USA. Also presented at the:
GDR-E05 meeting on Science and Applications of Nanotubes, October 2005. Houffalize, Belgium.
Ab initio study of semiconducting carbon nanotubes on the Si(100) surface
APS March Meeting, March 2006. Baltimore, Maryland.
Mechanical and electronic properties at the interface between the Si(100) surface and semiconducting carbon nanotubes
APS March Meeting, March 2007. Denver, Colorado.
Density-functional study of the interaction between a molecular magnet monolayer and a metallic surface
52nd Magnetism and Magnetic Materials Conference, November, 2007. Tampa, Florida.

Invited Talks:

El teorema GHZ. Summer, 2003. Facultad de Ciencias UNAM, Mexico.
A study of the GHZ theorem, the theoretical conditions upon which it is based, and the related experiment. Fall, 2004. Vaxjo University, Sweden.
Ingenieria de la estructura electronica en nanotubos de carbono mediante herramientas de simulacion. Fall, 2005. Instituto Politecnico Nacional, Mexico.
Interaction of semiconducting carbon nanotubes with the Si(100) surface. Fall, 2005. CEA Grenoble, France.
Ab initio study of semiconducting carbon nanotubes on the Si(100) surface. Spring, 2006. Sandia National Laboratory. Also presented in the Department of Physics, Virginia Tech.
The interaction between magnetic molecules and a gold surface. November 26, 2007. Condensed Matter Seminar. Virginia Tech.

Teaching Experience:

Grader/Teaching Assistant for the following courses at UIUC:

Undergraduate-Optics. Fall 2001
Undergraduate-Classical Mechanics. Spring 2002.
Graduate-Quantum Mechanics for Nanoscience and Nanotechnology. Fall 2004.
Graduate-Theory of Semiconductors and Semiconductor Devices. Fall 2005.

Other Professional Activities:

Referee for the following journals:

Journal of Applied Physics (AIP)
Journal of Physics: Condensed Matter (IOP)
Nanotechnology (IOP)
Optics Express (OSA)

Awards:

1995. First Place. National Physics Olympiad. Mexico.
1999. First Place. Leon M. Lederman Award.
The prize consisted in a summer stay at Los Alamos National Laboratory to work with Dr. Paul Kwiat.
This stay prolonged through the fall of 1999. I was re-invited for a summer stay in 2000.
2002. Award for the Best Undergraduate Thesis in Physics and Mathematics. Insitituto Politecnico Nacional (IPN).
2001-2006. Received full tuition and stipend for graduate study (UIUC).
2001-2004. Funded in part for graduate study by the Mexican National Council for Science and Technology (CONACyT).

The interaction between a monolayer of single-molecule magnets and a metal surface. SALVADOR BARRAZA-LOPEZ, MICHAEL C. AVERY AND KYUNGWHA PARK, J. Appl. Phys. 103, 07B907 (2008). doi:10.1063/1.2830014. Article. Local copy (PDF).

First-principles study of a single-molecule magnet Mn12 monolayer on the Au(111) surface. SALVADOR BARRAZA-LOPEZ, MICHAEL C. AVERY AND KYUNGWHA PARK, Phys. Rev. B 76, 224413 (2007). doi: 10.1103/PhysRevB.76.224413. Article. Local copy.

Preferential orientation of a chiral semiconducting carbon nanotube on the locally depassivated Si(100)-2×1:H surface identified by scanning tunneling microscopy. PETER M. ALBRECHT, SALVADOR BARRAZA-LOPEZ AND JOSEPH W. LYDING, Small 3, 1402 (2007). doi: 10.1002/smll.200700070. article

High-visibility interferometric measurement of the diffraction phase. SALVADOR BARRAZA-LOPEZ, DANIEL F. V. JAMES AND PAUL G. KWIAT, J. Opt. Soc. Am. A 24, 1148 (2007). Article . Local copy.

Conductance modulation of metallic carbon nanotubes by remote charged rings. SALVADOR BARRAZA-LOPEZ, SLAVA V. ROTKIN, YAN LI AND KARL HESS, Europhys. Lett. 69, 1003 (2005). doi: 10.1209/epl/i2004-10434-8. article

Experimental entanglement distillation and 'hidden' non-locality. PAUL G. KWIAT, SALVADOR BARRAZA-LOPEZ, ANDRE STEFANOV AND NICOLAS GISIN, Nature 409, 1014 (2001). doi:10.1038/35059017. article. A general description of this work can be found here.