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Functional Magnetic, Optical and Electronic Materials

Brongersma's research focuses on the fabrication and characterization of nanometer-size electronic and optical devices. The ability to engineer materials at the atomic level has opened myriad possibilities for the advancement of technologies that impact the areas of semiconductors, telecommunications, chemistry, and pharmaceuticals. His current research is aimed at the development of Si-based microphotonic functionality and plasmonic devices that can manipulate the flow of light at the nanoscale.

Clemens studies the growth, structure, magnetic properties, and mechanical properties of thin films and nanostructured materials. By controlling growth and atomic scale structure, he is able to tune and optimize properties. He is currently investigating materials for metallization, magnetic recording, electronic device, and hydrogen storage applications.

Cui studies nanoscale phenomena and their applications broadly defined. Research Interests include nanocrystal and nanowire synthesis and self-assembly, electron transfer and transport in nanomaterials and at the nanointerface, nanoscale electronic and photonic devices, batteries, solar cells, microbial fuel cells, water filters and chemical and biological sensors.

The key areas of investigation in our group are:
(1) light yield nonproportionality behavior in single crystal scintillators,
(2) control of grain boundaries and defects in transparent scintillator ceramics, and
(3) high speed, shape-controlled growth of single crystal scintillators.
We believe that these goals can be best achieved thorough the combination of basic and applied research, and the immediate application of results for engineering improved materials.

Materials physics: Probing correlated electrons at artificial interfaces and in confined systems; Atomic scale synthesis and control of complex oxide heterostructures; Oxide heterostructures for energy applications; Low-dimensional superconductivity; Novel devices based on interface states in oxides.

As our experimental understanding of nature has matured, we have come to realize just how artificial the distinction is between fundamental physical law—something that “just is”—and other kinds of physical law that “emerge” through self-organization. Everyday examples of the latter include material rigidity, magnetism, and super-fluidity, but there are countless others. Things become more troubling, however, when we realize that the vacuum of space-time also has symptoms of being emergent. “Fundamental” quantities such as the electron charge defocus and change value as you examine the vacuum at smaller and smaller length scales. Unification of forces becomes mathematically indistinguishable from “quantum phase transitions” of the vacuum. Heats of formation and other collective effects in the vacuum become implicated in inflationary theories of the universe. We are increasingly realizing that finding law – a quantitative relationship among measured quantities that is always true – is not eh same thing as finding fundamental truth. Indeed, when you measure only at “low” energies you simply cannot tell the difference between a law that emerges and a law that “just is”.

My academic career at Stanford has been focused on research efforts to understand the electronic properties of semiconductor surfaces and interfaces on an atomic scale using synchrotron radiation of importance for the development of modern electronic devices. I have taken a great interest in the development of synchrotron radiation and free electron laser facilities and instrumentation, and research policies for large scale facilities. I have been (and still am) a member/chairperson of a large number of review and advisory committees.

We seek to systematically elucidate the fundamental structure-property relationships underpinning the growth of 2D materials and their inclusion into van der Waals heterostructures. Greater understanding will enable a platform for engineering the properties of matter at the atomic scale and offer guidance for emerging applications in computing, energy, health, and quantum information science.

McIntyre’s group performs research on nanostructured inorganic materials for applications in electronics, energy technologies and sensors.  He is best known for his work on metal oxide/semiconductor interfaces, ultrathin dielectrics, defects in complex metal oxide thin films, and nanostructured Si-Ge single crystals.  His research team synthesizes materials, characterizes their structures and compositions with a variety of advanced microscopies and spectroscopies, studies the passivation of their interfaces, and measures functional properties of devices.

The Mukherjee group specializes in semiconductors that emit and detect light in the infrared. Our research enables better materials for data transmission, sensing, manufacturing, and environmental monitoring. We make high-quality thin films with IV-VI (PbSnSe) and III-V (GaAs-InAs/GaSb) material systems and spend much of our time understanding how imperfections in the crystalline structure such as dislocations and point defects impact their electronic and optical properties. This holds the key to directly integrating these semiconductors with silicon and germanium substrates for new hybrid circuits that combine infrared photonics and conventional electronics.

Pianetta's research is directed towards understanding how the atomic and electronic structure of semiconductor interfaces impacts device technology. His research includes the development of new analytical tools for these studies based on the use of synchrotron radiation. Recent projects include the development of ultrasensitive methods to analyze trace impurities on the surface of silicon wafers at levels as low as 1e-6 monolayer (~1e8 atoms/cm2) and the use of various photoelectron spectroscopies (X-ray photoemission, NEXAFS, X-ray standing waves and photoelectron diffraction) to determine the bonding and atomic structure at the interface between silicon and different passivating layers.

The Salleo Research Group is interested in novel materials and processing techniques for large-area and flexible electronic/photonic devices as well as ultra-fast laser processing for electronics, photonics and biotechnology. We also study defects and structure/property relations of polymeric semiconductors, nano-structured and amorphous materials in thin films.

My group studies novel ground states and functionality in thin films and heterostructures. We exploit recent advances in atomically precise heteroepitaxy of complex oxides to develop new materials and to probe novel interface phenomena. Many of these phenomena are then incorporated into prototypical device structures. Our recent focus is on strongly correlated materials, especially new spintronic materials, as well as magnetic junction devices and magnetic logic circuits.

Wang is engaged in the research of magnetic nanotechnology, biosensors, spintronics, integrated inductors and information storage. He uses modern thin-film growth techniques and lithography to engineer new electromagnetic materials and devices and to study their behavior at nanoscale and at very high frequencies. His group is investigating magnetic nanoparticles, high saturation soft magnetic materials, giant magnetoresistance spin valves, magnetic tunnel junctions, and spin electronic materials, with applications in cancer nanotechnology, in vitro diagnostics, rapid radiation triage, spin-based information processing, efficient energy conversion and storage, and extremely high-density magnetic recording.

White's research interests include magnetic phenomena related to data storage and spintronics.  He works on spin-current-induced switching of magnetic materials. The 3rd edition of his book, "Quantum Theory of Magnetism" was chosen to be reprinted in China as Vol. 10 in the series "Overseas Distinguished Books in Physics." He served on the Science Advisory Board of the Data Storage Institute in Singapore and on the boards of Silicon Graphics, Zilog, STMicroelectronics, Read-Rite and Ontrack Data.

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