Latha Venkataraman

RESEARCH

We measure fundamental properties of single molecule devices, seeking to understand the interplay of physics, chemistry and engineering at the nanometer scale. The underlying focus of our research is to fabricate single molecule circuits, a molecule attached to two electrodes, with varied functionality, where the circuit structure is defined with atomic precision. We measure how electronic conduction and single bond breaking forces in these devices relate not only to the molecular structure, but also to the metal contacts and linking bonds. Our experiments provide a deeper understanding of the fundamental physics of electron transport, while laying the groundwork for technological advances at the nanometer scale.

OPENINGs

Doctoral student and post-doctoral researchers.

NEWS

May. 2014 Congratulations to Arunabh Batra on successfully defending his thesis.

May. 2014 Sriharsha Aradhya receives "Simon Prize" for the most outstanding dissertation. Congratulations!

Apr. 2014 "Breakdown of Interference Rules in Azulene, a Non-Alternant Hydrocarbon" in collaboration with Profs. Campos and Solomon is published in Nano Letters and featured in Nanotechweb.org.

Mar. 2014 "Tunable Charge Transport in Single-Molecule Junctions via Electrolytic Gating" is published in Nano Letters and featured in Nanotechweb.org.

Feb. 2014 "Evaluating Atomic Components in Molecular Circuits", in collaboration with Prof. Nuckolls is published in Chemical Science.

Jan. 2014 "Determination of Energy Level Alignment and Coupling Strength in 4,4'-Bipyridine Single-Molecule Junctions", in collaboration with Prof. Neaton is published in Nano Letters.

Jan. 2014 "Aromaticity Decreases Single-Molecule Junction Conductance", in collaboration with Prof. Breslow is published in JACS.

News from 2013

Dec. 2013 "Transport properties of individual C60-molecules", in collaboration with Prof. Evers is published in J. Chem. Phys.

Nov. 2013 "Tuning Rectification in Single-Molecular Diodes", in collaboration with Profs. Nuckolls and Neaton is published in Nano Letters and featured in Nanotechweb.org.

Nov. 2013 "Silicon Ring Strain Creates High-Conductance Pathways in Single-Molecule Circuits", in collaboration with Profs. Nuckolls, Leighton and Steigerwald is published in JACS.

Aug. 2013 "Impact of Molecular Symmetry on Single-Molecule Conductance", in collaboration with Prof. Campos is published in JACS.

July 2013 "Ultrafast Charge Transfer Through Non-Covalent Au-N Interactions in Molecular Systems", in collaboration with Prof. Morgante and Cvetko is published in J. Phys. Chem. C.

July 2013 "Conductance of Molecular Junctions Formed with Silver Electrodes", in collaboration with Dr. Hybertsen is published in Nano Letters.

Jun. 2013 Congratulations to Sriharsha Aradhya on successfully defending his thesis.

May 2013 "Length-­‐Dependent Thermopower of Highly Conducting Au-­‐C Bonded Single Molecule Junctions", in collaboration with Dr. Hybertsen is published in Nano Letters.

May 2013 Congratulations to Jon Widawsky on successfully defending his thesis.

Apr. 2013 Congratulations to Sriharsha Aradhya for winning the "MRS Graduate Student Gold Award".

Mar. 2013 "Correlating Structure, Conductance and Mechanics of Silver Atomic-Scale Contacts", in collaboration with Prof. Halbritter is published in ACS Nano.

News from 2012

Dec. 2012 "The Importance of Direct Metal-π Coupling in Electronic Transport Through Conjugated Single-molecule Junctions", in collaboration with Prof. Nuckolls is published in J. Am. Chem. Soc.

Dec. 2012 "Quantitative Current-Voltage Characteristics in Molecular Junctions from First Principles", in collaboration with Dr. Neaton's group is published in Nano Letters.

Nov. 2012 "Quantum Soldering of Individual Quantum Dots", in collaboration with Prof. Nuckolls and Dr. Michael Steigerwald is published in Angewandte Chemie.

Oct. 2012 "Probing the Conductance Superposition Law in Single-Molecule Circuits with Parallel Paths", in collaboration with Prof. Breslow and Dr. Mark Hybertsen is published in Nature Nanotechnology along with a News & Views article.

Sep. 2012 "Quantifying Through-Space Charge Transfer Dynamics in π-Coupled Molecular Systems", in collaboration with Profs. Cvetko and Morgante is published in Nature Communications.

Aug. 2012 "Van der Waals Interactions in Metal-Organic Interfaces at the Single-Molecule Level", in collaboration with Dr. Mark Hybertsen is published in Nature Materials along with a News & Views article and featured on the Columbia SEAS web page.

July. 2012 "Electronic Transport and Mechanical Stability of Carboxyl Linked Single-Molecule Junctions", in collaboration with Colin Nuckolls group is published in Phy. Chem. Chem. Phys.

Jun. 2012 Sriharsha Aradhya receives "Best Student Paper Award" at the SEM Conference in Costa Mesa, California. Congratulations!

Mar. 2012 "Correlation Analysis of Atomic and Single-Molecule Junction Conductance", in collaboration with Prof. Halbritter's group is published in ACS Nano.

Feb. 2012 "Dissecting Contact Mechanics from Quantum Interference in Single-Molecule Junctions of Stilbene Derivatives", in collaboration with Prof. Nuckoll's group is published in Nano Letters.

Feb. 2012 "Conductive Molecular Silicon" in collaboration with Prof. Nuckoll's group is published in the J. Am. Chem. Soc.

Jan. 2012 "Linker Dependent Bond Rupture Force Measurements in Single-Molecule Junctions" in collaboration with Dr. Hybertsen is published in the J. Am. Chem. Soc.

Jan. 2012 Congratulations to Masha Kamenetska on successfully defending her thesis with distinction.

News from 2011

Dec. 2011 Congratulations to Michael Frei on successfully defending his thesis.

Dec. 2011 We measure the thermopower of single molecule junctions for both HOMO and LUMO conducting molecules and compare these to DFT based calculations. This work, in collaboration with Dr. Neaton's group is published in Nano Letters.

Oct. 2011 Our work showing that we can achieve close to 1G0 in a single molecule junction in collaboration with Prof. Breslow's group and with Dr. Hybertsen is published in JACS and featured in the October 17 issue of C&EN.

Jun. 2011 Our work on probing Tetramethyl benzenediamine on an Au(111) surface was published in J. Phys. Chem. C. This was in collaboration with Prof. Morgante's group and was partly carried out at the Center for Functional Nanomaterials (BNL).

Jun. 2011 Our work demonstrating in situ formation of highly conducting covalent Au–C contacts in single molecule junctions in collaboration with Prof. Brelow's group and with Dr. Hybertsen is published in Nature Nanotechnology.

Jun. 2011. Our work demonstrating the synthesis and measurement of transport through single inorganic molecular clusters, in collaboration with Dr. Steigerwald and Prof. Nuckoll's group is published in JACS.

May. 2011 Our work demonstrating that single molecule conductance can be modulated by solvents, in collaboration with Jeff Neaton is published in Nano Letters.

Apr. 2011 Our work demonstrating a single molecule potentiometer in collaboration with Colin Nuckoll's group was published in Nano Letters and featured in the April issue of C&EN.

Mar. 2011 Our work correlating single bond rupture forces with molecular backbone chemistry, in collaboration with Mark Hybertsen, is published in Nano Letters.

Feb. 2011 Our work on the conductance of pi-stacked molecules in collaboration with Prof. Breslow's group is published the J. Am. Chem. Soc. and on the cover.

Feb. 2011 Latha receives the Alfred P. Sloan Research Fellowship

News from 2008-2010

Dec. 2010 Our lab moves to the new North-West Corner Building of Columbia University's main campus.

Aug. 2010 Our work on the conductance of biphenylenes in collaboration with Prof. Breslow's group is published the Organic Letters.

Jun. 2010 Our work probing energy level alignment of amine-linked molecules on Au substrates, in collaboration with Jeff Neaton's and Alberto Morgante's groups is published in Nano Letters.

Jun. 2010 Our work on the conductance of diphenylphosphine linked molecules in collaboration with Colin Nuckolls' and Mark Hybertsen's group is published in J. Phys. Chem. Letters.

May 2010 Our work on the conductance of pyriding terminated molecules in collaboration with Jeff Neaton's group is published in J. Am. Chem. Soc.

Apr. 2010 Congratulations to Arun on receiving an NSF Graduate Research Fellowship.

Jan. 2010 Congratulations to Eek on receiving the Rubicon Post-Doctoral Fellowship.

Oct. 2009 We present a technique to measure statistically significant I-Vs on single molecule junctions. This work will appear in special issue of Nanotechnology this fall.

Jul. 2009 Our work on the effect of molecular rotations on conductance, in collaboration with Colin Nuckolls' and Mark Hybertsen's groups is published in JACS.

Apr. 2009 Our work on single molecule switching in 4,4'bipyridine, in collaboration with Jeff Neaton's group is published in Nature Nanotechnology

Mar. 2009 Our work on single molecule junction formation and evolution, in collaboration with Mark Hybertsen's group is published in Physical Review Letters.

Oct. 2008 Latha receives Packard Fellowship

Jun. 2008 Latha receives ACS-PRF Grant

Jan. 2008 Latha receives NSF Career Award