News


Quantum Engineering Research Paper on “Transparent Electrodes” One of Top 20 Downloads from the Journal Nano Letters

  • By Aude Marjolin
  • 8 May 2014

A journal article by PQI researchers investigating the properties of copper nanomeshes to form transparent electrodes was one of the Top 20 articles downloaded from the journal Nano Letters web site in April 2014. 

The team is led by principle investigator and PQI faculty Paul W. Leu, PhD, and Co-PIs include PQI faculty Jung-Kun Lee, PhD, and research assistants Bo Ding, Tongchuan Gao, and Baomin Wang. The article, "Uniform and Ordered Copper Nanomeshes by Microsphere Lithography for Transparent Electrodes," was published in Nano Letters.


Sara Majetich Awarded Seed Grant from CMU's Scott Institute for Energy Innovation

  • By Aude Marjolin
  • 12 February 2014

Sara Majetich has received a seed grant from CMU's Wilton E. Scott Institute for Energy Innovation to explore ways to make small powerful permanent magnets without the use of rare earth or noble metals. This could be a breakthrough development because the rare earth elements used in the strongest of today's permanent magnets are becoming increasingly scarce and costly.  The institute, made possible by a lead gift from CMU alumni Sherman Scott (E'66), president and founder of Delmar systems, and his wife, university trustee Joyce Bowie Scott (A'65), is focused on improving energy efficiency and developing new, clean, affordable and sustainable energy sources.  A key mission of the Scott Institute, established in September 2012, is to stimulate new research initiatives and connections across the campus.


Patrick D. Gallagher Named Chancellor-Elect of Pitt

  • By Workstudy User
  • 11 February 2014

Patrick Gallagher, Acting Deputy Secretary of the US Department of Commerce and Director of the National Institute of Standards and Technology (NIST) has been named the next Chancellor of the University of Pittsburgh. Gallagher, who received his Ph.D. in Physics at the University of Pittsburgh, will succeed Mark A. Nordenberg, who served as Chancellor for the last 19 years.

For more details, read the Pitt press release, and read here about the impact Gallagher had as Director of NIST.


Jeremy Levy Co-Edits October 2013 Issue of MRS Bulletin Dedicated to Quantum Computing

  • By Workstudy User
  • 2 December 2013

Materials Issues for Quantum Computation: 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. Materials issues arise in all of these, and this issue of MRS Bulletin describes how materials challenges and opportunities arise and have been used to make qubit-based quantum circuits using very different materials systems.


Semiconductor Nanocrosses Lay Foundations for Topological Quantum Bits

  • By Workstudy User
  • 17 October 2013

PQI faculty Sergey Frolov co-authors a paper in Nature Nanotechnology on the growth and characterization of high quality semiconductor nanocross structures. These structures are the building blocks for topological quantum bits based on recently discovered Majorana fermions.

These tests should make clear whether or not Majorana’s (and the nanowires that house them) are a suitable base for the so-called topological quantum computer.


Paul Leu and Kevin Chen Awarded NSF Grant to Develop Improved Solar Cell Manufacturing

  • By Aude Marjolin
  • 14 August 2013

PQI faculty Paul W. Leu and Kevin P. Chen were awarded a $107,498 Early-concept Grants for Exploratory Research (EAGER grant) to develop a new process for the scalable laser manufacturing of more efficient solar cells. 

"We're exploring new structures, called photonic crystals, that are at the wavelength scale or smaller to better trap light within the absorbing region of the solar cell," Dr. Leu explains.


Sergey Frolov and Vincent Liu Receive Kaufman Foundation Inaugural Award

  • By Workstudy User
  • 25 July 2013

The Charles E. Kaufman Foundation, part of The Pittsburgh Foundation, today announced its first series of grants – amounting to almost $1.6 million – to support cutting-edge scientific research at institutions across the State of Pennsylvania.

A New Initiative grant was awarded to Sergey M. Frolov and W. Vincent Liu, who receive $242,310 over two years ($121,155 per year) for research on “Topological Quantum Wire Emulators.”


Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure

  • By Aude Marjolin
  • 21 June 2013

The remarkable transport properties of graphene, such as the high electron mobility, make it a promising material for electronics. However, unlike semiconductors such as silicon, graphene's electronic structure lacks a band gap, and a transistor made out of graphene would not have an “off” state. Ben Hunt and his colleagues modulated the electronic properties of graphene by building a heterostructure consisting of a graphene flake resting on hexagonal boron nitride (hBN), which has the same honeycomb structure as graphene, but consists of alternating boron and nitrogen atoms instead of carbons. The natural mismatch between the graphene and hBN lattices led to a moire pattern with a large wavelength, causing the opening of a band gap, the formation of an elusive fractional quantum Hall state, and, at high magnetic fields, a fractal phenomenon in the electronic structure called the Hofstadter butterfly.

Pages