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From Quantum Mechanics to Force Fields

  • By Burcu Ozden
  • 22 November 2017

Ken Jordan and his colleague are invited to write a special topic issue in the journal of chemical physics (JCP). This work is dedicated to the ongoing efforts of the theoretical chemistry community to develop a new generation of accurate force fields based on data from high-level electronic structure calculations and to develop faster electronic structure methods for testing and designing force fields as well as for carrying out simulations. 

What molecular properties give rise to a strong piezoelectric response?

  • By Burcu Ozden
  • 22 November 2017

In this study Geoffrey R. Hutchison and his colleagues tried to answer the question of " What molecular properties give rise to a strong piezoelectric response?"  To do so, they systematically probe the interplay among peptide chemical structure, folding propensity, and piezoelectric properties, uncovering in the process new insights into the origin of peptide electromechanical response. They have designed variety of peptides and peptoids and test the effect of molecular properties on piezoelectric response via serious measurements including ircular dichroism (CD), Polarization-modulated infrared reflection−absorption spectroscopy (PM-IRRAS), tomic force microscopy (AFM), piezo-force microscopy (PFM), and X-ray photoelectron spectroscopy (XPS) measurements. They showed backbone rigidity is an important determinant in peptide electromechanical responsiveness. 

New Era in Thermal Scanning Probe Lithography

  • By Burcu Ozden
  • 15 November 2017

Tevis Jacobs and his collaborators from IBM and SwissLitho were achieved sub-10 nanometer feature size in Silicon using thermal scanning probe lithography. In this work, they  the t-SPL parameters that influence high-resolution patterning on the transfer stack and demonstrate that sub-15 nm half-pitch resolution patterning and transfer by t-SPL are feasible. They found that the resolution in t-SPL is limited by the extent of the plastic zone in thermo-mechanical indentation on the pattern transfer stack because, at temperatures approaching the resist’s decomposition temperature, the line shape widens, reducing the achievable resolution. They achieved reliable transfer of patterned dense lines down to 14 nm half-pitch and in the best case 11 nm half-pitch. Furthermore, evidently they showed that an enhanced resolution below 10 nm half-pitch might be possible on a mechanically different transfer stack.

Watching

Carbon nanotube field-effect transistor, Quantum light in information technology, A novel conductive electron systems, Ion migration in a hybrid perovskite crystal

Storified by PQI Communication ·
Wed, Nov 22 2017 15:27:36

An unprecedented 3D view of crystal defects, An artificial spin ice ground state, A transmission electron microscopy image of the quantum dots, Conductivity mechanisms in macro-scale carbon nanotube films, Efficiency droop occurs in nanometer-deep quantum wells

Storified by PQI Communication ·
Tue, Nov 21 2017 14:44:07

Quantum mechanical tunnelling to map energy and momentum of electrons, InSb nanowire networks show the ideal conditions for the measurement of Majoranas, Spin relaxation in layered graphene/TMDC heterostructures, Captured electrons move or tunnel between the quantum dots in a controlled way

Storified by PQI Communication ·
Fri, Nov 17 2017 14:25:57

Future quantum devices, A real quantum system like atoms in an optical lattice, Tunable skyrmions in material

Storified by PQI Communication ·
Thu, Nov 16 2017 14:38:36

An entirely new form of computation, Stretching leads to a change in the electronic properties of the film and significantly improves its photoluminescence efficiency, A novel approach to develop a TiAl alloy, Quantum computers use electron spin orientation

Storified by PQI Communication ·
Wed, Nov 15 2017 16:09:36