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August 20, 2020

Fall 2020 Physics Colloquium Series

Date: Thursday, October 1, 2020

Time: 4:00pm – 5:00pm

Speaker: Richard Taylor, Department Head, UO Physics

Title: State of the Department

Location: Zoom On-Line/Remote
Join Zoom Meeting
https://uoregon.zoom.us/j/7249079639
Meeting ID: 724 907 9639

 

 

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June 22, 2020

COVID 19: Links to helpful resources

UO Campus and Physics Office space remains closed during COVID phase restrictions

In order to reduce the risk of exposure to students, staff, and faculty, and in response to the emergent COVID-19 situation, the Physics Department administrative office will be closed beginning March 17, 2020 for the coming weeks. Updates about university closures can be found here www.uoregon.edu/coronavirus

During this period, the office will provide service remotely. Email and phone messages will be checked regularly.

Refer to your March 20th ‘Package Deliveries’ e-mail for more information on FedEx, UPS, USPS delivery process.

Please use the following contact information for specific questions.

  • For University mental health support resources, please visit the Counseling Center website (https://counseling.uoregon.edu/crisis-support) or call the health center crisis hot line 541-346-3227
  • For undergraduate advising inquiries, please email Scott Fisher at rsf@uoregon.edu or call 541-346-4799
  • For graduate student-related inquiries, please email Dean Livelybrooks at dlivelyb@uoregon.edu or call 541-346-5855
  • For personnel-related inquiries, please email Anthony Fichera at afichera@uoregon.edu or call 541-346-4768
  • For accounting-related inquiries, please email physicsacctg@uoregon.edu
  • For payroll-related inquiries, please email physicspayroll@uoregon.edu
  • For Physics operations-related inquiries, please email Anthony Fichera at afichera@uoregon.edu or call 541-346-4768
  • For grant-related inquiries, please email physicsacctg@uoregon.edu
  • For budget-related inquiries, please email Anthony Fichera at afichera@uoregon.edu or call 541-346-4768
  • For purchasing and travel-related inquiries, please email Jani Scallion at scallion@uoregon.edu or call 541-346-5208

Thank you for your flexibility and understanding. Stay vigilant.

Richard Taylor                         Anthony Fichera
Department Head                    Business Manager

As a critical student service, the University Counseling Center will remain open during spring term for in-person appointments and drop-in therapy, while adhering to CDC health guidelines. Additional information is available on the counseling center webpage or by calling the support/crisis line 541-346-3227.

Academic modifications and support during COVID-19

Building Access: Request permission to enter UO campus:DOCUMENTING ACCESS TO BUILDINGS
Before coming to campus, including to retrieve materials from an office or work space, employees are expected to submit their plans into the appropriate smartsheet, accessible via the links below, to request and/or document their access.

COVID Updates

FAQs

Forms, Physics specific

Library Services for Remote Learning, For students

Phased Approach for Restarting Research Activity On Campus 

Physics Drop in Help Center support

Physics Undergraduate Student Resources

Physics Undergraduate Advising

Recent Faculty Research Publications

Remote Support

Student Advising

ZOOM Training resources

March 31, 2020

COVID 19: Links to helpful resources

  • Instructors continue to prepare for remote teaching for spring term, which begins on March 30. The Office of the Provost sent faculty and graduate employees information and guidance about connecting with students, livestreaming courses, accessibility, and other academic matters for the coming term. An academic continuity page continues to be updated with information for instructors.
  • As a critical student service, the University Counseling Center will remain open during spring term for in-person appointments and drop-in therapy, while adhering to CDC health guidelines. Additional information is available on the counseling center webpage or by calling the support/crisis line 541-346-3227.

Academic modifications and support during COVID-19

Building Access Request form

Building Access: Request permission to enter UO campus:DOCUMENTING ACCESS TO BUILDINGS
Before coming to campus, including to retrieve materials from an office or work space, employees are expected to submit their plans into the appropriate smartsheet, accessible via the links below, to request and/or document their access.

Commencement

COVID Updates

Faculty Services for Remote Teaching

FAQs

Forms, Physics specific

Library Services for Remote Learning, For students

On Campus Research Request Form

Phased Approach for Restarting Research Activity On Campus 

Physics Drop in Help Center support

Physics Undergraduate Student Resources

Physics Undergraduate Advising

Recent Faculty Research Publications

Remote Support

Student Advising

Quick Chat:  Quick reference page for COVID support updates

ZOOM Training resources

March 26, 2020

The university will hold a virtual town hall for students and their families

  • The university will hold a virtual town hall for students and their families to answer questions about remote education, student support, and how the UO is protecting campus and the community during the COVID-19 outbreak. The event will be livestreamed from 2:30 – 4:00 p.m. on Monday, March 30 and can be viewed on this webpage. You may submit a question ahead of time anonymously using this web form.
March 13, 2020

Physics Colloquium

The Physics Colloquium series will resume in Spring term.

March 6, 2020

Physics Colloquium

Today’s Physics Colloquium will continue as scheduled.  (Updated 3/12/20 8:45am)

Date: Thursday, March 12, 2020

Speaker: Ben Farr, UO Physics

Title: The Latest Results from the LIGO-Virgo O3 Observing Run

Abstract: Having recently celebrated the fourth anniversary of the first detection of gravitational waves from a binary black hole merger, the LIGO and Virgo detectors have collected an impressive census of compact binary mergers in the local universe. By the end of the second observing run in August 2017 the LIGO Scientific Collaboration and Virgo Collaboration claimed a total of 10 binary black hole mergers and one binary neutron star merger. The third observing run began in April 2019, and during the first six months the collaborations alerted the astronomical community of 33 merger candidates. The preliminary classifications of these events include 21 binary black hole merger candidates, 4 neutron star black hole merger candidates, and 4 binary neutron star candidates. I will present some of what ground-based gravitational wave astronomy has taught us about compact binaries over the last four years, and what may lie ahead.

Host: Ray Frey

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February 28, 2020

Physics Colloquium

Date: Thursday, March 5, 2020

Speaker: Markus Luty, UC Davis

Title: Classical Radiation Reaction

Abstract: Every physics undergraduate knows that when electrically charged particles accelerate, they radiate away energy and momentum. This means that they must experience a “radiation reaction” force in addition to the Lorentz force. Over 100 years ago, Lorentz and Abraham showed that this force is proportional to the derivative of the acceleration. However, this makes a number of paradoxical predictions, such as runaway solutions and the absence of radiation from charges undergoing constant acceleration. This has led to over a century of conflicting claims in the literature and in textbooks. This talk will give an account of radiation reaction at the advanced undergraduate level that aims to be both understandable and correct. I will give an elementary derivation of the Abraham-Lorentz force using energy and momentum conservation. I then show that in a theory of classical electrons with radius smaller than the classical electron radius, the total energy is unbounded from below, and the theory is catastrophically unstable. If instead the classical approximation breaks down at a radius larger than the classical radius, the structure of the electron cuts off the instability. Although the electron is an elementary particle with no structure, quantum effects cause the classical theory to break down, saving us from this instability. I will close with some comments on radiation reaction for constant acceleration

Host: Spencer Chang

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February 21, 2020

Physics Colloquium

Date: Thursday, February 27, 2020

Speaker: Ben McMorran, UO Physics

Title: Seeing the invisible using electrons

Abstract: New developments in electron optics enable quantum-inspired measurements with electrons. For example, nanoscale diffraction holograms can produce free electron wavefunctions with non-trivial phase profiles that provide a new way to probe the chirality and spatial coherence of nanoscale plasmonics. We report results demonstrating symmetry-breaking inelastic interactions between electron vortex beams and chiral nanoparticle clusters. Nanoscale material phase gratings can also serve as optimized beamsplitters for electrons. We used this in an electron Mach-Zehnder interferometer with large path separation – up to 200 microns – and have demonstrated its use to measure and image electric and magnetic fields at the nanoscale. Recent results on using electron interferometry to probe 3d structure of magnetic skyrmions will be discussed. More recently, we demonstrated interaction-free measurements with this matter wave interferometer. These early demonstrations may also serve as key steps towards novel forms of electron microscopy and spectroscopy that could potentially be used to coherently probe quantum systems – perhaps even manipulate them – as well as image sensitive phase objects like biological molecules with atomic resolution.

Host: Brian Smith

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February 14, 2020

Physics Colloquium

Date: Thursday, February 20, 2020

Speaker:  Ethan Minot, Oregon State University

Title: Electrons Dancing on a String

Abstract: Electrons confined to one-dimensional (1d) materials offer fascinating opportunities for applications and fundamental studies. Our group uses individually-contacted carbon nanotubes (CNTs) as a model experimental system to investigate these electrons dancing on strings. I will discuss application areas including sensors, quantum light sources, transistors, and photovoltaics. The unique features of CNTs enable sensors that detect single electrons, light-emitting diodes that emit single photons on demand, band gaps that are driven by tunable Coulomb interactions, and photovoltaic devices with extraordinary quantum efficiency. Beyond our application-driven research, we also explore the fundamental realm. I will discuss measurements of quantum interference effects, and the compressibility of “electron crystals” (Wigner crystals) that form at low temperature and low electron density.

Host: Benjamín J. Alemán

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February 10, 2020

Physics Colloquium

Date: Thursday, February 13, 2020

Speaker: Jason Hogan, Stanford University

Title: Atom interferometry for fundamental physics and gravitational wave detection

Abstract: In recent years, atom interferometry and atomic clocks have made impressive gains in sensitivity and time precision.  The best atomic clocks have stability corresponding to a loss of less than one second in the lifetime of the universe.  Matter wave interferometers have achieved record-breaking coherence times (seconds) and atomic wavepacket separations (over half a meter), resulting in a significant enhancement in accelerometer and gravity gradiometer sensitivity.  Leveraging these advances, atomic sensors are now poised to become a powerful tool for discovery in fundamental physics.  I will describe a new type of atom interferometry based on narrow-line optical transitions that combines inertial sensitivity with features from the best atomic clocks, allowing for increased immunity to technical noise and systematic errors.  This technique is central to the Mid-band Atomic Gravitational wave Interferometric Sensor (MAGIS) proposal, which is targeted to detect gravitational waves in a frequency band complementary to existing detectors (0.03 Hz – 10 Hz), the optimal frequency range to support multi-messenger astronomy.  I will also discuss MAGIS-100, a 100-meter tall atomic sensor now being constructed at Fermilab that will serve as a prototype of such a gravitational wave detector, and that will be sensitive to proposed ultra-light dark matter (scalar and vector couplings) at unprecedented levels.

Host: David Wineland

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