179 citations · 1.5k across the 33 of their papers we have counts for
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Quantum dynamics of single-photon detection using functionalized quantum transport electronic channels
Catalin D. Spataru, François Léonard
Single photon detectors have historically consisted of macroscopic-sized materials but recent experimental and theoretical progress suggests new approaches based on nanoscale and m…
Bulk-Free Topological Insulator Bi2Se3 nanoribbons with Magnetotransport Signatures of Dirac Surface States
Gunta Kunakova, Luca Galletti, Sophie Charpentier +6
Many applications for topological insulators (TIs) as well as new phenomena require devices with reduced dimensions. While much progress has been made to realize thin films of TIs…
Strong Photothermoelectric Response and Contact Reactivity of the Dirac Semimetal ZrTe5
François Léonard, Wenlong Yu, Kimberlee C. Collins +4
The family of three-dimensional topological insulators opens new avenues to discover novel photophysics and to develop novel types of photodetectors. ZrTe5 has been shown to be a D…
Dynamic Wavelength-Tunable Photodetector Using Subwavelength Graphene Field-Effect Transistors
François Léonard, Catalin D. Spataru, Michael Goldflam +2
Dynamic wavelength tunability has long been the holy grail of photodetector technology. Because of its atomic thickness and unique properties, graphene opens up new paradigms to re…
Electrical Contacts to Three-Dimensional Arrays of Carbon Nanotubes
Aron W. Cummings, Julien Varennes, François Léonard
We use numerical simulations to investigate the properties of metal contacts to three-dimensional arrays of carbon nanotubes (CNTs). For undoped arrays top-contacted with high or l…
Spectroscopic Properties of Nanotube-Chromophore Hybrids
Changshui Huang, Randy K. Wang, Bryan M. Wong +7
Recently, individual single-walled carbon nanotubes (SWNTs) functionalized with azo-benzene chromophores were shown to form a new class of hybrid nanomaterials for optoelectronics…
Functionalization of Single-Wall Carbon Nanotubes with Chromophores of Opposite Internal Dipole Orientation
Yuanchun Zhao, Changshui Huang, Myungwoong Kim +4
We report the functionalization of carbon nanotubes with two azobenzene-based chromophores with large internal dipole moments and opposite dipole orientations. The molecules are at…
Enhanced Performance of Short-Channel Carbon Nanotube Field-Effect Transistors Due to Gate-Modulated Electrical Contacts
Aron W. Cummings, François Léonard
We use numerical simulations to analyze recent experimental measurements of short-channel carbon nanotube field-effect transistors with palladium contacts. We show that the gate st…
Electrostatic effects on contacts to carbon nanotube transistors
Aron W. Cummings, François Léonard
We use numerical simulations to investigate the effect of electrostatics on the source and drain contacts of carbon nanotube field-effect transistors. We find that unscreened charg…
Reduced Joule heating in nanowires
François Léonard
The temperature distribution in nanowires due to Joule heating is studied analytically using a continuum model and a Green's function approach. We show that the temperatures reache…
Poole-Frenkel Effect and Phonon-Assisted Tunneling in GaAs Nanowires
Aaron M. Katzenmeyer, François Léonard, A. Alec Talin +2
We present electronic transport measurements of GaAs nanowires grown by catalyst-free metal-organic chemical vapor deposition. Despite the nanowires being doped with a relatively h…
Observation of Space-Charge-Limited Transport in InAs Nanowires
Aaron M. Katzenmeyer, François Léonard, A. Alec Talin +4
Recent theory and experiment have suggested that space-charge-limited transport should be prevalent in high aspect-ratio semiconducting nanowires. We report on InAs nanowires exhib…
Self-consistent ac quantum transport using nonequilibrium Green functions
Diego Kienle, Mani Vaidyanathan, François Léonard
We develop an approach for self-consistent ac quantum transport in the presence of time-dependent potentials at non-transport terminals. We apply the approach to calculate the high…
Terahertz response of carbon nanotube transistors
Diego Kienle, François Léonard
We present an approach for time-dependent quantum transport based on a self-consistent non-equilibrium Green function formalism. The technique is applied to a ballistic carbon nano…
Crosstalk between nanotube devices: contact and channel effects
Francois Leonard
At reduced dimensionality, Coulomb interactions play a crucial role in determining device properties. While such interactions within the same carbon nanotube have been shown to hav…
Photocurrents in nanotube junctions
D. A. Stewart, Francois Leonard
Photocurrents in nanotube p-n junctions are calculated using a non-equilibrium Green function quantum transport formalism. The short-circuit photocurrent displays band-to-band tran…