Controlled manipulation of oxygen vacancies using nanoscale flexoelectricity

Precisely controlled smart polymer scaffold for nanoscale manipulation of biomolecules.

We demonstrate the application of a novel smart surface to modulate the orientation of immobilized double stranded DNA (dsDNA) and the conformation of a polymer scaffold through variation in buffer pH and ionic strength. An amphoteric poly(dimethylacrylamide) based coating containing weak acrylamido acids and bases, which are copolymerized together with the neutral monomer, is covalently bound ...

Nanoscale mechanical switching of ferroelectric polarization via flexoelectricity

Trapping and manipulation of isolated atoms using nanoscale plasmonic structures.

We propose and analyze a scheme to interface individual neutral atoms with nanoscale solid-state systems. The interface is enabled by optically trapping the atom via the strong near-field generated by a sharp metallic nanotip. We show that under realistic conditions, a neutral atom can be trapped with position uncertainties of just a few nanometers, and within tens of nanometers of other surfac...

LAO/STO and oxygen vacancies: dielectric modeling

Let’s model the LAO/STO system as two dielectrics films of infinite extent in the xy plane and finite slabs in the z direction. The dielectric constant of LAO will be 1 and that of STO will be 2. The thicknesses will be d1 and d2. The z axis runs orthogonal to these films: z = 0 will be the LAO surface, z > 0 will be the vacuum above the LAO film, z = −d1 will be the LAO/STO interface, and z = ...

STM Manipulation of Nanoscale Biological Molecules

Scanning-tunneling-microscope (STM) is an instrument not only used to see individual atoms by imaging, but also used to touch and pick-up the atoms or to hear their vibrations by means of manipulation and spectroscopy [1]. In this perspective, the STM can be considered as the eyes, hands and ears of the scientists connecting our macroscopic world to the exciting atomic and nanoscopic world. Her...