The Spring 2018 colloquia will be held in the lobby of the Physical Sciences Complex unless otherwise noted

Each week during the semester, the Department of Physics invites faculty, students and the local community to hear prominent scientists discuss intriguing physics research. The Spring 2018 colloquia will be held Tuesdays in the Physical Sciences Complex lobby at 4:00 p.m. (preceded by light refreshments at 3:30 p.m.)

Parking is available in the Regents Drive Parking Garage (PG2). An attendant will direct visitors within the garage. Additionally, a free ShuttleUM bus runs between the College Park Metro Station and Regents Drive at about eight-minute intervals.

For further information, please contact the Physics Department at 301-405-5946 or email This email address is being protected from spambots. You need JavaScript enabled to view it..

January 30
Seung-Hun Lee, University of Virginia
Hosted by Eun-Suk Seo

New Materials for Next Generation Printable Solar Cells

The realization of economical renewable energy technologies is critical for securing long-term prosperity of mankind and mitigating the threat of climate change. Power from the Sun is the most abundant source of renewable energy. In just one hour, more solar energy hits the Earth’s surface than humanity uses in an entire year. Therefore, development of solar cells that can produce electrical power at a cheaper rate than fossil fuel-based electricity is highly desirable.  However, only about one percent of the world’s energy production currently comes from solar cells. This is because conventional technologies, mostly based on silicon solar cells, are too expensive to be competitive with energy generated by burning fossil fuels. What is needed is research on new solar cell materials that can be fabricated into solar cells with high-efficiency and low-cost simultaneously.
 
Hybrid Organic-Inorganic perovskites (HOIPs) have recently been discovered as one of the most promising next generation solar cell materials. Solar cells based on HOIPs have achieved high efficiency that rivals that of the conventional silicon solar cells. At the same time, HOIPs can be deposited on surfaces from ink solutions which enable low-cost and high-throughput manufacturing of solar cells as if printing out newspapers. In this talk, I will present our recent research that revealed microscopic mechanism of the photovoltaic properties of HOIPs.
February 6
Rob Schoelkopf, Yale University 
CNAM Carr Lecture, hosted by Chris Lobb and Fred Wellstood

The Prospects for Scalable Quantum Computing with Superconducting Circuits

Dramatic progress has been made in the last decade and a half towards realizing solid-state systems for quantum information processing with superconducting quantum circuits. Artificial atoms (or qubits) based on Josephson junctions have improved their coherence times more than a million-fold, have been entangled, and used to perform simple quantum algorithms. The next challenge for the field is demonstrating quantum error correction that actually improves the lifetimes, a necessary step for building more complex systems. At Yale we have been pursuing a hardware-efficient approach for error correction, that relies on encoding information in a bosonic oscillator, the so-called “cat codes.” With this approach, we have applied real-time measurements and feedback to achieve the first extension of the lifetime of a quantum bit through error correction. For scaling, an attractive approach is the modular architecture, in which small quantum processors are networked together into a larger whole. I will present a realization of a gate between logical qubits. This is the first implementation of a teleported C-NOT gate, which is a key building block for the modular approach.

 

February 13
Matt Green, NC State
Hosted by Carter Hall

Coherent Neutrino Scattering at the SNS

Coherent Elastic Neutrino-Nucleus Scattering (CEvNS) is a neutral-current process in which a neutrino interacts coherently with an entire nucleus. While the coherence of the process leads to a large cross section enhancement with increasing neutron number, the low momentum transfer results in difficult-to-detect low energy nuclear recoils. The COHERENT Collaboration has combined state-of-the-art low-threshold detector technology with the intense flux of neutrinos generated at Oak Ridge National Laboratory’s Spallation Neutron Source (SNS) to detect CEvNS for the first time, and is developing it as a tool for searches for physics beyond the Standard Model, including Non-Standard Neutrino Interactions (NSIs), oscillations into sterile neutrinos, nuclear form factors, and neutrino magnetic moments. This talk will detail the first-ever observation of CEvNS, as reported in our recent publication in Science, and the COHERENT Collaboration's follow-up efforts to fully characterize the interaction with Liquid Argon, High-Purity Germanium, and Sodium-Iodide -based detectors.

 

 

 

February 20
John Paul Chou, Rutgers
Hosted by Sarah Eno

Dark Matter in Collision at the LHC

The Large Hadron Collider at CERN has ushered in a new era in fundamental physics, in which images of proton-proton collisions of unprecedented quality and quantity are recorded at the highest energies ever obtained in a lab. In 2012, the CMS and ATLAS experiments discovered the Higgs boson, completing the picture of the Standard Model of particle physics. Where else will this new era take us? Dark matter, seen astronomically through its gravitational effects, has a natural particle interpretation and should be observable at the LHC. But this simple story may have unexpected twists and turns. I will discuss the different ways that dark matter and related particles could manifest at the LHC and what unexpected secrets may lie in store for the future.

February 27

Martin Savage, UW Seattle
Hosted by Zohreh Davoudi

TBA

 
March 6

Fernando Miralles-Wilhelm, UMD Atmospheric & Oceanic Science
Hosted by Victor Yakovenko

TBA

 

 


March 13

 
Robert Boyd, Rochester/Ottawa
Hosted by Howard Milchberg

TBA


March 27
 
Liang Fu, MIT
Hosted by Brian Swingle

TBA

 

 

April 3

Chan Joshi, UCLA
Hosted by Howard Milchberg

TBA

 

 

 
April 10
David Schwartz
Hosted by Nick Hadley

TBA

 

 

April 17
Zohreh Davoudi, University of Maryland
Hosted by Brian Swingle

TBA

 

April 24
Smitha Vishveshwara, UIUC
Hosted by Jay Deep Sau

TBA

 

 

May 1
Mark Van Raamsdonk, UBC
Hosted by Brian Swingle

TBA

 

May 8
Rudolf Tromp, IBM
Hosted by Ichiro Takeuchi

TBA

 

 

Upcoming Events

Feb
19

Mon, Feb 19, 2018 4:00 pm - 5:30 pm

Feb
20

Tue, Feb 20, 2018 11:00 am - 12:00 pm

Feb
20

Tue, Feb 20, 2018 11:15 am - 12:15 pm

Feb
20

Tue, Feb 20, 2018 4:00 pm - 5:00 pm

Feb
21

Wed, Feb 21, 2018 11:00 am - 12:00 pm

Feb
21

Wed, Feb 21, 2018 1:00 pm - 2:30 pm

Feb
21

Wed, Feb 21, 2018 4:00 pm - 5:30 pm

Feb
22

Thu, Feb 22, 2018 12:30 pm - 1:30 pm

Feb
22

Thu, Feb 22, 2018 2:00 pm - 3:30 pm