Events

Long Ju, Cornell University
Monday, January 22, 2018 - 4:30pm
DH A301D​

Berr y phase played an important role in quantum mechanics and underlying the physics of a wide range of materials from topological phases of matters to various 2D materials. While the effect of Berry phase has been extensively studied and shown through quantized electron transport experiment, the geometric aspect of wavefunction— determined by Berry curvature has remained much less understood experimentally. In this talk, I will use bilayer graphene as a model system to demonstrate effects of Berry phase and Berry curvature on materials’ electronic and optical properties. I will first show our study of topological valley transport in the stacking domain walls of bilayer graphene, where near-field infrared nanoscopy is combined with low-temperature transport measurement. Then I will report our study of excitons in the tunable bandgap of bilayer graphene using advanced spectroscopy tools.These excitons obey unusual valley-dependen t optical selection rules and very large magnetic moment, both originated from the tunable pseudospin and Berry curvature effect. Finally, I will discuss our recent efforts on probing the low energy electron dynamics in Weyl semimetals, and the possibility of detecting related Berry phase effects in these 3D topological materials.

Jan25
4:00pm
Characterizing Electrocatalysts with Scanning Electrochemical Microscopy
Talk location: TBA Spring 2018 Seminar electrochemistry Electron microscopy
Kevin Leonard
University of Kansas
Jan25
4:30pm
Spin Dynamics of Topological Spin Textures in Chiral Magnets
The chiral spin textures are a consequence of the anti-symmetric exchange interaction, which presents in the material systems with broken inversion symmetry, such as B20FeGe. This interaction enables chiral magnetic order, including topologically non-trivial magnetic skyrmions, which display rich new magnetic phenomena and require low critical current densities to manipulate. This makes magnetic skyrmions a promising platform for power-efficient spintronics applications. Therefore, a deeper understanding of the static and dynamic magnetic properties of these materials ...
Talk location: DH  A200 Spring 2018 Seminar Topological phenomena Spin Chiral
Emrah Turgut
Cornell University
Jan29
3:00pm
Shuolong Yang (Cornell University)
Talk location: Allen Hall 321 Spring 2018 Seminar
Shuolong Yang
Cornell University
Jan30
12:00pm
Lunch Talk : Shuolong Yang
Talk location: Allen Hall 321 Spring 2018 Lunch Talk
Shuolong Yang
Cornell University
Feb01
4:00pm
Thomas Purdy (NIST)
Talk location: Allen Hall 321 Spring 2018 Seminar
Thomas Purdy
NIST
Feb01
4:00pm
EPR Spectroscopy with Single Spin Sensitivity Using a Nitrogen-Vacancy Center in Diamond
Talk location: Eberly 307 Spring 2018 Seminar N-V Centers Spin
Susumu Takahashi
University of South Carolina
Feb02
12:00pm
Thomas Purdy (NIST)
Talk location: Allen Hall 321 Spring 2018 Seminar
Thomas Purdy
NIST
Feb05
3:00pm
Hannes Bernien (Harvard University)
Talk location: Allen Hall 321 Spring 2018 Seminar
Hannes Bernien
Harvard University
Feb05
4:00pm
Can Evolutionary Dynamics Be Understood Quantitatively?
The basic laws of evolution have been known for more than a century and there is overwhelming evidence for the facts of evolution. Yet little is understood quantitatively about the dynamical processes that drive evolution: by physicists' standards the theory of evolution is far from fully-fledged. Huge advances in DNA sequencing technology and laboratory experiments have enabled direct observations of evolution in action and, together with theoretical developments, opened up great opportunities for dramatically advancing ...
Talk location: 102 Thaw Hall Spring 2018 Seminar
Daniel S. Fisher
Stanford University
Feb06
12:00pm
Lunch Talk: Hannes Bernien
Talk location: Allen Hall 321 Spring 2018 Seminar
Hannes Bernien
Harvard University
Feb08
4:00pm
Quantum sensing in a new single-molecule regime
Quantum optics has had a profound impact on precision measurements, and recently enabled probing various physical quantities, such as magnetic fields and temperature, with nanoscale spatial resolution. Such advancements in ‘quantum sensing’ have brought the elusive dream of performing nuclear magnetic resonance spectroscopy (NMR) on individual biomolecules closer to reality. In my talk, I will discuss the development and application of novel quantum metrological technologies to study biological systems at a single-molecule level. I will ...
Talk location: Allen Hall 321 Spring 2018 Seminar Quantum Optics
Peter Maurer
Stanford University
Feb09
12:00pm
Lunch Talk: Peter Maurer
Quantum optics has had a profound impact on precision measurements, and recently enabled probing various physical quantities, such as magnetic fields and temperature, with nanoscale spatial resolution. Such advancements in ‘quantum sensing’ have brought the elusive dream of performing nuclear magnetic resonance spectroscopy (NMR) on individual biomolecules closer to reality. In my talk, I will discuss the development and application of novel quantum metrological technologies to study biological systems at a single-molecule level. I will ...
Talk location: Allen Hall 321 Spring 2018 Seminar Quantum Optics
Peter Maurer
Stanford University
Feb09
4:30pm
Control and Local Measurement of the Spin Chemical Potential in a Magnetic Insulator
In recent decades, a large scientific effort has focused on harnessing spin transport for providing insights into novel materials and low-dissipation information processing. We introduce single spin magnetometry based on nitrogen-vacancy (NV) centers in diamond as a new and generic platform to locally probe spin chemical potentials which essentially determine the flow of spin currents. We use this platform to investigate magnons in a magnetic insulator yttrium iron garnet (YIG) on a 100 nanometer length ...
Talk location: DH A301D Spring 2018 Seminar Spin Magnetic Insulator
Chunhui Du
Harvard University
Mar08
4:00pm
Exploiting Orbital Angular Momenta and Nonlinear Frequency Conversion in Plasmonic Devices
Talk location: Allen Hall 321 Spring 2018 Seminar Plasmonics Nonlinear Frequency
Chen-Bin (Robin) Huang
Institute of Photonics Technologies, National Tsing Hua University
Mar28
4:00pm
Kenneth Burch (Boston College)
Talk location: CMU 2018 Seminar
Kenneth Burch
Boston College
Mar29
4:00pm
Manuel Houzet (CEA - Grenoble Alpes University)
Talk location: 321 Allen Hall 2018 Seminar
Manuel Houzet
CEA - Grenoble Alpes University
Apr05
2:30pm
Soft Chemistry Routes to Complex Semiconductors: Ternary Pnictide and Dichalcogenide Nanocrystals
Talk location: Chevron 150 Spring 2018 Seminar Semiconductors Dichalcogenide
Javier Vela
Iowa State University
Apr16
4:15pm
Andrew Cleland ( Institute for Molecular Engineering / University of Chicago)
Talk location: Thaw Hall 102 Spring 2018 Colloquium
Andrew Cleland
Institute for Molecular Engineering / University of Chicago
Apr18
9:00am
PQI2018
The annual PQI signature event will cover a wide range of topics in quantum science and engineering by featuring prominent invited keynote lecturers and highlighting the current research of PQI members. All talks are colloquium-style and accessible to a broad audience.
Talk location: University Club 123 University Place PQI Event
Multiple speakers
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