Room-Temperature Electronically-Controlled Ferromagnetism at the LaAlO3/SrTiO3 Interface

  • By Workstudy
  • 18 October 2014

Reports of emergent conductivity, superconductivity and magnetism have helped to fuel intense interest in the rich physics and technological potential of complex-oxide interfaces. Here we employ magnetic force microscopy to search for room-temperature magnetism in the well-studied ​LaAlO3/​SrTiO3 system.

Writing and Low-Temperature Characterization of Oxide Nanostructures

  • By Workstudy
  • 11 July 2014

Oxide nanostructures provide new opportunities for science and technology. The interfacial conductivity between LaAlO3 and SrTiO3 can be controlled with near-atomic precision using a conductive atomic force microscopy technique. The protocol for creating and measuring conductive nanostructures at LaAlO3/SrTiO3 interfaces is demonstrated.

Epitaxial Si encapsulation of highly misfitting SiC quantum dot arrays formed on Si (001)

  • By Workstudy
  • 9 January 2014

This work examines Si overgrowth to encapsulate 3C-SiC quantum dot arrays epitaxially grownon Si substrates. Using transmission electron microscopy, we show how the crystalline quality of the Si cap depends on the growth conditions. Overgrowth at 300 °C leads to a planar,epitaxial Si cap, but with small crystallographic rotations in the cap above each quantum dot.

Direct imaging of LaAlO3/SrTiO3 nanostructures using piezoresponse force microscopy

  • By Workstudy
  • 19 November 2013

The interface between LaAlO3 and TiO2-terminated SrTiO3 can be switched between metastable conductive and insulating states using a conductive atomic force microscope probe. Determination of the nanoscale dimensions has previously required a destructive readout (e.g., local restoration of an insulating state).

Materials Issues for Quantum Computation

  • By Workstudy
  • 15 October 2013

James N. Eckstein and Jeremy Levy , Guest Editors The new field of quantum computing uses qubits (quantum bits) in place of classical bits to carry out certain types of computation. Physical systems that act as qubits encompass a wide range of technologies, from ions, to local defect states in crystals, and on to microelectronic devices addressable with wire interconnects.

Nonlocal current-voltage characteristics of gated superconducting sketched oxide nanostructures

  • By Workstudy
  • 6 September 2013

Effects from nonequilibrium superconductivity play a major role in the physics of superconducting nanoelectronics. Notably, charge imbalance arising from the point at which the superconducting device contacts normal-metal leads is prevalent, particularly in reduced dimensions.

Oxide-based platform for reconfigurable superconducting nanoelectronics

  • By Workstudy
  • 22 August 2013

We report quasi-1D superconductivity at the interface of LaAlO3 and SrTiO3. The material system and nanostructure fabrication method supply a new platform for superconducting nanoelectronics. Nanostructures having line widths w ~ 10 nm are formed from the parent two-dimensional electron liquid using conductive atomic force microscope lithography.

Yanjun Ma's PhD Thesis published

  • By Workstudy
  • 1 July 2013

Light-matter interaction is a historically ancient topic, yet it is still under intense research, owing to the invention of novel optical techniques and the growth of unprecedented materials. The first goal of the work presented in this thesis is to understand the fundamental origin of various nonlinear optical phenomena. Susceptibilities are physical quantities describing the way that a material system responds to an optical field.