Sag calculations for suspended wires

Suspended carbon nanotube quantum wires with two gates.

Suspended single-walled carbon nanotube devices comprised of high-quality electrical contacts and two electrostatic gates per device have been prepared. Compared to nanotubes pinned on substrates, the suspended devices exhibit little hysteresis related to environmental factors and act as cleaner Fabry-Perot interferometers or single-electron transistors. The high-field saturation currents in th...

Why Do Suspended Wires Thin down , and Why Is the Monatomic Wire Stretched

We have examined theoretically the spontaneous thinning process of tipsuspended nanowires, and subsequently studied the structure and stability of the monatomic gold wires recently observed by Transmission Electron Microscopy (TEM). The methods used include thermodynamics, classical many-body force simulations, Local Density (LDA) and Generalized Gradient (GGA) electronic structure calculations...

Negative differential conductance and hot phonons in suspended nanotube molecular wires.

Freely suspended metallic single-walled carbon nanotubes (SWNTs) exhibit reduced current carrying ability compared to those lying on substrates, and striking negative differential conductance at low electric fields. Theoretical analysis reveals significant self-heating effects including electron scattering by hot nonequilibrium optical phonons. Electron transport characteristics under strong se...

Ivan A. Sag

Ivan Sag died on September 10, 2013, after a long illness. He is survived by his wife, Stanford sociolinguistics professor Penny Eckert. In a career spanning four decades, he published over 100 articles and 10 books, centered on the theme of developing precise, implementable, testable, psychologically plausible, and scalable models of natural language, especially syntax and semantics. Sag earne...

BrainWave: Control solutions for SAG mills