Matthew Johnson, West Virginia University
Thursday, March 30, 2017 - 4:30pm
Wean Hall 7316

In this talk, I will describe my background and my approach to the fabrication of nanostructures through three different interdisciplinary projects while highlighting potential applications of the nanosystems we have developed and exciting recent developments in nano-characterization. The first project uses conventional nanoprocessing to fabricate interband cascade lasers. These efficient mid-IR lasers have potential chemical sensing applications and devices of this type have been the preferred mid-IR laser for extra-terrestrial use as methane and water sensors on Mars. The second project bypasses conventional photo- and e-beam lithographic patterning techniques using self-assembled, nanoporous, anodic aluminum oxide as templates to fabricate ordered arrays of nano-dots, holes, and rings. Using this approach we have developed nano-confined polymer electrolytes for nano-integrated batteries, fuel cells, capacitors and displays and have demonstrated a two order-of-magnitude improvement in ionic conductivity in confined structures relative to bulk films. The third project uses bead lithography as an inexpensive technique to fabricate hexagonal patterns with repeat spacing from about 0.1 to 5 µm. We use this method to pattern proteins creating biomemetic surfaces. Our goal is to better understand the role of these cells in the tissue healing process.  I will conclude the talk by discussing my planned research activities at WVU.

Apr03
4:30pm
Quantum Control of Spins in Silicon
One of the remarkable features of spins in the solid state is the enormous range of time-scales over which coherent manipulation is possible. If one considers gate-controlled manipulation of nuclear spins at one extreme, and strongly-interacting multi-electron qubits at the other extreme, coherent control of spins in semiconductors has been demonstrated with over 9 orders of magnitude variation in the manipulation time. Remarkably, confining three electrons in two neighboring quantum dots enables all electrical control..
Spring 2017 Seminar Condensed Matter
Mark Eriksson
University of Wisconsin-Madison
Apr05
11:00am
Women in Quantum Science and Engineering Lecture Series: Nicole Benedek
The PQI Women in Quantum Science and Engineering Lecture Series is held in the framework of the Year of Diversity at Pitt to celebrate women scientists. All talks are colloquium-style and open to the public.
PQI Event Year of Diversity
Nicole Benedek
Cornell University
Apr06
9:00am
PQI Quantum Day
The PQI Quantum Day will bring Taylor-Allderdice High School students to our campuses to experience a day as a physicist, a chemist, or an engineer!
PQI Event
Multiple speakers
Apr06
4:30pm
Control of Light-Matter Interaction in 2D Atomic Crystals
Two-dimensional (2D) atomic crystals have emerged as a very attractive class of optoelectronic material due to the unprecedented strength in its interaction with light. In this talk I will discuss approaches to enhance the strength of this interaction even further using microcavities, and metamaterials. Specifically I will discuss enhancement of spontaneous emission [1], formation of strongly coupled exciton-photon quasiparticles (microcavity polaritons) [2], valley polarized polaritons and enhancement of nonlinear optical response from 2D transition metal..
Spring 2017 Seminar
Vinod Menon
The City College of New York
Apr10
4:30pm
Paper and Circuits, Only Atoms Thick
2D layered materials are like paper: they can be colored, stitched, stacked, and folded to form integrated devices with atomic thickness. In this talk, I will discuss how different 2D materials can be grown with distinct electrical and optical properties (coloring), how they can be connected laterally to form pattered circuits (stitching), and how their properties can be controlled by the interlayer rotation (twisting). We will then discuss how these atomically thin papers and circuits..
Spring 2017 Seminar 2D materials
Jiwoong Park
University of Chicago
Apr11
11:00am
Women in Quantum Science and Engineering Lecture Series: Anastassia Alexandrova
The PQI Women in Quantum Science and Engineering Lecture Series is held in the framework of the Year of Diversity at Pitt to celebrate women scientists. All talks are colloquium-style and open to the public.
PQI Event Year of Diversity
Anastassia Alexandrova
University of California, Los Angeles
Apr13
4:30pm
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Reception Immediately following in Mellon Institute Lobby
Spring 2017 Buhl Lecture
William Bialek
Princeton University
Apr18
11:00am
Women in Quantum Science and Engineering Lecture Series: Jill Millstone
The PQI Women in Quantum Science and Engineering Lecture Series is held in the framework of the Year of Diversity at Pitt to celebrate women scientists. All talks are colloquium-style and open to the public.
PQI Event Year of Diversity
Jill Millstone
University of Pittsburgh
Apr20
4:00pm
Quantum Phases and Phase Transitions in Two-Dimensional Highly Correlated Metals at Oxide Interfaces
The two-dimensional diffusive metal stabilized at the interface of SrTiO3 and the Mott Insulator perovskite LaTiO3[1-2] has challenged many notions related to the formation and electronic behavior of the two-dimensional electron gas (2DEG) at the well studies LaAlO3-SrTiO3 interface. Here we discuss specifically the stability of the superconducting phase[3] at LaTiO3 – SrTiO3 interface, the nature of the superconductor – normal metal quantum phase transition (T=0 limit) driven by magnetic field, significance of the field..
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Ramesh Budhani
Air Force Research Laboratory
Apr26
9:00am
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