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ADV2-012185

Defect-induced room temperature ferromagnetism in un-doped InN film

Q. Y. Xie, M. Q. Gu, L. Huang, F. M. Zhang, and X. S. Wu

Here we show epitaxial InN film, a well-known narrow gap semiconductor can be ferromagnetic without doping. The Curie temperature acquired is as high as 297K and the magnetic moment is 1.6μB, spawning a whole new class of potential room temperature DMS (diluted magnetic semiconductors).

AIP Advances 2, 012185 (2012)

ADV2-012178

Intrinsic thermoelectric power of group VB metals

Gunadhor Singh Okram

Reinvestigations of the thermopower α of group VB metals in polycrystalline forms in the temperature range of 6-300K revealed the critical nature of the sample surface contaminations and heat treatment especially for niobium. Strikingly small magnitude, negative sign, phonon drag dip and superconductivity not reported previously were observed in surface-cleaned single crystalline Nb. However, while thermopower magnitudes are small, mixed signs were found in the polycrystalline V, Nb and Ta samples.

AIP Advances 2, 012178 (2012)

ADV_HarLavan-1

Ambient organic molecular passivation of Si yields near-ideal, Schottky-Mott limited, junctions

Rotem Har-Lavan, Omer Yaffe, Pranav Joshi, Roy Kazaz, Hagai Cohen, and David Cahen

The authors show how a simple, short chemical treatment, done in air, to adsorb a molecular monolayer onto the Si, pulls the semiconductor back into the fold of “well-behaved” semiconductors that obey the Schottky-Mott model. Nearly all of the systematic change in electrical behaviour of the Si surface, as a result of different molecular treatments, can be transferred to its interface with a metal, Hg in this case. Thus, for the first time, Si junction behavior could be predicted from the measured properties of its components according to the Schottky-Mott model.

AIP Advances 2, 012164 (2012)

ADV2-012165

Semiclassical Monte Carlo simulation studies of spin dephasing in InP and InSb nanowires

Ashish Kumar, M. W. Akram, and Bahniman Ghosh

A multisubband semiclassical Monte Carlo approach was used to investigate spin polarized transport in InP and InSb nanowires. The authors found the dephasing rate to be very strong for InSb as compared to InP which has larger spin dephasing lengths. The ensemble averaged spin components varied differently for both InP and InSb nanowires. The steady state spin distribution also showed a difference between the two III-V nanowires.

AIP Advances 2, 012165 (2012)


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Community Voices

"the authors have proposed a novel exact formalism to determine the Born exponent for ionic solids. The Born exponents they have calculated compares well with the empirical data."

Jissy AK, 2 February 2012
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"...your questions certainly hit important issues. the loss of a measured signal at low concentration could indicate a "noise floor" for the quantity of mobility...."

Alan Johnson, 25 January 2012
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"Nice article. I have just a few questions: Why does the mobility abruptly become concentration-independent below 10^5 cfu/ml ?..."

Tyler Engstrom, 24 January 2012
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"The article demonstrates the intricate physics of nanoclusters and how Au309 melts from within...."

Ayan Datta, 18 January 2012
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"A very interesting work, presenting a quite original method for obtaining magnetic nanoparticles of iron oxide and a complete characterization of the so obtained samples, with a broad range of complementary techniques."

Ricardo Lopez Anton, 21 October 2011
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"an interesting article that documents a novel approach to the generation of few-layer graphene films with varying numbers of layers on a single substrate in a controlled manner...."

Alan Johnson, 3 October 2011
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"...S. Dhar at National University of Singapore and colleagues have developed an ingenious experiment approach using laser ablation to selectively grow various graphene layers..."

Wilfrid Prellier, 20 May 2011
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Announcements

Special Topic on Physics of Cancer
AIP Advances Executive Editor Robert Austin and other respected scientists have contributed papers to this special topic section that examines the behavior of tumors from the physical, genomic and biological perspectives. The main themes for the special section came from a workshop held in June 2011 at Princeton Physical Sciences Oncology Center, one of twelve such centers funded by the US NIH's National Cancer Institute.
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