David Broido
Boston College
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Featured researches published by David Broido.
Science | 2010
Jae Hun Seol; Insun Jo; Arden L. Moore; Lucas Lindsay; Zachary H. Aitken; Michael T. Pettes; Xuesong Li; Zhen Yao; Rui Huang; David Broido; Natalio Mingo; Rodney S. Ruoff; Li Shi
Heat Flow in Graphene Unsupported graphene sheets show exceptional thermal transport properties, but are these properties maintained when a graphene sheet is in contact with a substrate? Seol et al. (p. 213; see the Perspective by Prasher) measured the thermal conductivity of graphene supported on silicon dioxide and found that, while the conductivity was considerably lower than that of free-standing graphene, it was still greater than that of metals such as copper. A theoretical model suggested that the out-of-plane flexing vibrations of the graphene play a key role in thermal transport. Thus, graphene may help in applications such as conducting heat away from electronic circuits. The thermal conductivity of graphene supported on silicon dioxide remains high, despite phonon scattering by the substrate. The reported thermal conductivity (κ) of suspended graphene, 3000 to 5000 watts per meter per kelvin, exceeds that of diamond and graphite. Thus, graphene can be useful in solving heat dissipation problems such as those in nanoelectronics. However, contact with a substrate could affect the thermal transport properties of graphene. Here, we show experimentally that κ of monolayer graphene exfoliated on a silicon dioxide support is still as high as about 600 watts per meter per kelvin near room temperature, exceeding those of metals such as copper. It is lower than that of suspended graphene because of phonons leaking across the graphene-support interface and strong interface-scattering of flexural modes, which make a large contribution to κ in suspended graphene according to a theoretical calculation.
Physical Review B | 2010
Lucas Lindsay; David Broido
We have examined the commonly used Tersoff and Brenner empirical interatomic potentials in the context of the phonon dispersions in graphene. We have found a parameter set for each empirical potential that provides improved fits to some structural data and to the in-plane phonon dispersion data for graphite. These optimized parameter sets yield values of the acoustic phonon velocities that are in better agreement with measured data. They also provide lattice thermal conductivity values in single-walled carbon nanotubes that are considerably improved compared to those obtained from the original parameter sets.
Applied Physics Letters | 2007
David Broido; Michael Malorny; Gerd Birner; Natalio Mingo; Derek A. Stewart
The original version of this article may be found at the Applied Physics Letters website: http://dx.doi.org/10.1063/1.2822891 Copyright (2007) American Institute of Physics
Proceedings of the National Academy of Sciences of the United States of America | 2013
Qian Zhang; Bolin Liao; Yucheng Lan; Kevin Lukas; Weishu Liu; Keivan Esfarjani; Cyril Opeil; David Broido; Gang Chen; Zhifeng Ren
From an environmental perspective, lead-free SnTe would be preferable for solid-state waste heat recovery if its thermoelectric figure-of-merit could be brought close to that of the lead-containing chalcogenides. In this work, we studied the thermoelectric properties of nanostructured SnTe with different dopants, and found indium-doped SnTe showed extraordinarily large Seebeck coefficients that cannot be explained properly by the conventional two-valence band model. We attributed this enhancement of Seebeck coefficients to resonant levels created by the indium impurities inside the valence band, supported by the first-principles simulations. This, together with the lower thermal conductivity resulting from the decreased grain size by ball milling and hot pressing, improved both the peak and average nondimensional figure-of-merit (ZT) significantly. A peak ZT of ∼1.1 was obtained in 0.25 atom % In-doped SnTe at about 873 K.
Journal of the American Chemical Society | 2012
Qian Zhang; Feng Cao; Weishu Liu; Kevin Lukas; Bo Yu; Shuo Chen; Cyril Opeil; David Broido; Gang Chen; Zhifeng Ren
We present detailed studies of potassium doping in PbTe(1-y)Se(y) (y = 0, 0.15, 0.25, 0.75, 0.85, 0.95, and 1). It was found that Se increases the doping concentration of K in PbTe as a result of the balance of electronegativity and also lowers the lattice thermal conductivity because of the increased number of point defects. Tuning the composition and carrier concentration to increase the density of states around the Fermi level results in higher Seebeck coefficients for the two valence bands of PbTe(1-y)Se(y). Peak thermoelectric figure of merit (ZT) values of ~1.6 and ~1.7 were obtained for Te-rich K(0.02)Pb(0.98)Te(0.75)Se(0.25) at 773 K and Se-rich K(0.02)Pb(0.98)Te(0.15)Se(0.85) at 873 K, respectively. However, the average ZT was higher in Te-rich compositions than in Se-rich compositions, with the best found in K(0.02)Pb(0.98)Te(0.75)Se(0.25). Such a result is due to the improved electron transport afforded by heavy K doping with the assistance of Se.
Physical Review Letters | 1996
E. H. Aifer; Bennett B. Goldberg; David Broido
A dramatic reduction in the spin polarization of a two-dimensional electron gas in a magnetic field is observed when the Fermi energy moves off the midpoint of the spin gap of the lowest Landau level,
Journal of Applied Physics | 1999
S. G. Walkauskas; David Broido; K. Kempa; T. L. Reinecke
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Applied Physics Letters | 1995
David Broido; T. L. Reinecke
. The spin polarization is measured by magnetoabsorption spectroscopy which distinguishes the occupancy of the two electron spin states. The rapid decay of spin alignment over small changes to both higher and lower magnetic field provides experimental evidence for the presence of Skyrmion excitations where exchange energy dominates Zeeman energy in the quantum Hall regime at
Applied Physics Letters | 1997
David Broido; T. L. Reinecke
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Journal of the American Chemical Society | 2012
Qian Zhang; Feng Cao; Kevin Lukas; Weishu Liu; Keivan Esfarjani; Cyril Opeil; David Broido; David Parker; David J. Singh; Gang Chen; Zhifeng Ren
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