In this work, the temperature effects due to Joule heating obtained by application of a direct current electric potential were investigated for a microchannel with cylindrical insulating posts employed for insulator-based dielectrophoresis. The conductivity of the suspending medium, the local electric field, and the gradient of the squared electric field, which directly affect the magnitude of ...

We calculate the electrical conductivity in the early universe at temperatures below as well as above the electroweak vacuum scale, Tc ' 100GeV. Debye and dynamical screening of electric and magnetic interactions leads to a finite conductivity, σel ∼ T/α ln(1/α), at temperatures well below Tc. At temperatures above, W ± charge-exchange processes – analogous to color exchange through gluons in Q...

We propose an objective and robust method to extract the electrical conductance of single molecules connected to metal electrodes from a set of measured conductance data. Our method roots in the physics of tunneling and is tested on octanedithiol using mechanically controllable break junctions. The single molecule conductance values can be deduced without the need for data selection.

We theoretically explored the combined role of conformational fluctuations and quantum interference in determining the electrical conductance of single-molecule break junctions. In particular we computed the conductance of a family of methylsulfide-functionalized trans-α,ω-diphenyloligoene molecules, with terminal phenyl rings containing meta or para linkages, for which (at least in the absence...

2 Titania Thin Films from 30 to 320 K 3 Jin Fang, Christian Reitz, Torsten Brezesinski, E. Joseph Nemanick, Chris B. Kang, 4 Sarah H. Tolbert, and Laurent Pilon* 5 Henry Samueli School of Engineering and Applied Science Mechanical and Aerospace Engineering Department, 6 University of California, Los Angeles, California 90095-1597, United States 7 Giessen Institute of Physical Chemistry, Justus-...

This paper reports on the influence of laser irradiation onto the electrical conductance of gold nanocontacts established with the mechanically controllable breakjunction technique. We concentrate here on the study of reversible conductance changes which can be as high as 200%. We investigate the dependence on the initial conductance of the contacts, the wavelength, the intensity and position o...

We analyze theoretically the formation of stretched Pd-nanowires and their interaction with hydrogen. In our approach, we simulate the nanowire stretching process using a first-principles molecular-dynamics method to obtain realistic atomic geometries of the contact in its final stages before the nanowire breaks. The electrical conductance of the nanowire is also calculated at each point of the...

A large number of half-Heusler compounds have been recently proposed as three-dimensional (3D) topological insulators (TIs) with tunable physical properties. However, no transport measurements associated with the topological surface states have been observed in these half-Heusler candidates due to the dominating contribution from bulk electrical conductance. Here we show that, by reducing the m...

Citation Garg, Jivtesh, and Gang Chen. "Minimum thermal conductivity in superlattices: A first-principles formalism. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters.

Provided the electrical properties of electroburnt graphene junctions can be understood and controlled, they have the potential to underpin the development of a wide range of future sub-10-nm electrical devices. We examine both theoretically and experimentally the electrical conductance of electroburnt graphene junctions at the last stages of nanogap formation. We account for the appearance of ...