Fall 2017

Strong THz fields and nonlinear THz interactions with charges, dipoles, and spins

Speaker(s): 
Keith Nelson
Dates: 
Monday, November 6, 2017 - 1:00pm

Dramatic advances in tabletop generation of THz pulses with high field levels have enabled nonlinear THz spectroscopy and THz control over molecules and materials. The most widely used approach for generation of strong fields in the 0.2-2 THz range involves excitation of phonon-polaritons in ferroelectric host crystals, and a THz polaritonics platform has been developed that includes capabilities for THz field control and visualization as well as direct and strong coupling to collective spin waves (magnons). Recent developments in THz generation, nonlinear spectroscopy, and control over...

Quantum dynamics of thermalizing systems

Christopher White, Caltech IQIM

I will describe a method "DMT" for approximating density operators of 1D systems as low bond dimension matrix product operators that, when combined with a standard framework for time evolution (TEBD), makes possible simulation of the dynamics of strongly thermalizing systems to arbitrary times. The method performs well for both near-equilibrium initial states (Gibbs states with spatially varying temperatures) and far-from-equilibrium initial states, including quenches across phase transitions and pure states. I will also discuss ongoing work applying the method to the diffusive-subdiffusive transition in the ergodic phase of the random-field Heisenberg model.

Quantum dynamics of thermalizing systems

Speaker(s): 
Christopher White
Dates: 
Thursday, September 28, 2017 - 11:00am

I will describe a method "DMT" for approximating density operators of 1D systems as low bond dimension matrix product operators that, when combined with a standard framework for time evolution (TEBD), makes possible simulation of the dynamics of strongly thermalizing systems to arbitrary times. The method performs well for both near-equilibrium initial states (Gibbs states with spatially varying temperatures) and far-from-equilibrium initial states, including quenches across phase transitions and pure states. I will also discuss ongoing work applying the method to the diffusive-...

Plasma Processing; Reactive Sputter Etching and Deposition

Speaker(s): 
JR Gaines, Kurt J. Lesker Co. Ron Hawranko, Leybold USA, and Chris Horwitz
Dates: 
Thursday, October 19, 2017 - 9:00am to Friday, October 20, 2017 - 5:00pm

Pennsylvania Chapter of American Vacuum Society will be hosting two days-long “Plasma Processing; Reactive Sputter Etching and Deposition" workshop at the University Club of the University of Pittsburgh Pittsburgh, PA on October 19-20, 2017.

Vacuum Fundamentals, Techniques, and Deposition Technology

Speaker(s): 
JR Gaines, Kurt J. Lesker Co. Ron Hawranko, Leybold USA, and Chris Horwitz
Dates: 
Monday, October 16, 2017 - 9:00am to Tuesday, October 17, 2017 - 5:00pm

Pennsylvania Chapter of American Vacuum Society will be hosting two days-long “Vacuum Fundamentals, Techniques, and Deposition Technology” workshop at the University Club of the University of Pittsburgh Pittsburgh, PA on October 16-17, 2017.

Venkat Viswanathan Remains Skeptical of Tesla's Self-Driving Trucks

  • By Burcu Ozden
  • 30 August 2017

When will we see electric trucks appear on major roadways? Potentially in September. Tesla is currently developing driverless, long-haul electric semi-trucks that can move in “platoons,” or closely knit packs. But some scientists, like Venkat Viswanathan, doubt that Tesla can fulfill its promises. According to Viswanathan, electric trucks are not economically feasible yet because they would require massive batteries to power their long distance road-trips across the country. “Your cargo [would] essentially become the battery,” he says in an article for the New York Times. And because of that, there would be little room to carry goods.

 

DARPA : Young Faculty Award (YFA) Proposers Day Web Event

Speaker(s): 
DARPA
Dates: 
Tuesday, August 29, 2017 - 2:00pm to 5:00pm

DARPA will present its Young Faculty Award webinar tomorrow afternoon (2PM-5PM- Tuesday August 29); the Office of Research will host a viewing of the event. Interested early career faculty may contact Ryan Champagne or register online- there is space available. DARPA’s webinars provide an introduction to the agency, describe program requirements, and provide an opportunity to ask questions to the program manager. 

For more information check the following websites;

The Many Phases of Two-Dimensional WTe2

Speaker(s): 
Valla Fatemi
Dates: 
Thursday, October 26, 2017 - 3:00pm to 4:30pm

Quantum materials research aims to uncover exotic physics and identify avenues towards next generation technologies. In particular, van der Waals materials and topological systems present a rich landscape for engineering novel electronic properties. In this talk, I will present our experiments investigating the physics of ultra-thin WTe2, in which we find three phases to add to the 2D materials library. (1) Trilayer WTe2 exhibits a finite-density semimetallic phase with strongly gate-tunable magnetoresistance. (2) Un-doped monolayer WTe2 exhibits behaviors...

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