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Oct4
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"Manipulating superconductivity in cuprates by selective ultrafast light excitation"
Presented by: Cassandra Hunt
ABSTRACT: Ultrafast light excitation is proving to be a powerful tool to manipulate electronic, spin, and structural behavior in solids. The key is tailoring light pulses to selectively pump a specific excitation channel without introducing quasiparticle heating. I will discuss two different methods to support superconductivity in cuprate superconductors using mid-infrared light that targets lattice phonon excitations. In the lanthanide cuprate La1.8-xEu0.2SrxCuO4, superconductivity is suppressed around x = 1/8 doping by charge and spin stripe order that is stabilized in the CuO2 planes by underlying lattice distortions. By targeting an in-plane Cu-O stretching mode, charge order can be suppressed and superconductivity reintroduced throughout the charge ordered regime. The relaxation dynamics of the light-induced phase reveals information about how superconductivity competes with the ground state. In YBa2Cu3O6+x, a different phonon excitation, this time of the apical oxygen atoms that sit above and below pairs of CuO2 planes, appears to support superconductivity. This is measured as enhanced Josephson coupling between pairs of CuO2 planes and a corresponding blue shift in the Josephson plasma mode. Surprisingly, this same excitation generates a plasma mode very similar to the Josephson mode even far above the superconducting transition temperature, throughout the pseudogap phase. I will discuss how the relaxation pathway of this mode points to a Josephson tunneling origin and explore possible mechanisms driving the formation of this state.
BIO: Cassandra Hunt is a Miller Research Fellow at the University of California, Berkeley. She joined as a fellow in October 2015 after completing her Ph.D. in condensed matter physics at the University of Illinois at Urbana-Champaign, in the group of Laura Greene. From fall 2010 through 2014, she worked primarily in collaboration with the lab of Andrea Cavalleri at the Max Planck Institute for Structure and Dynamics of Matter in Hamburg, Germany. Her research focuses on using selective, ultrafast light excitation to manipulate material properties in correlated systems. Cassandra is interested both in using light to control material behavior and also as a tool to understand phase competition in the ground state of complex materials. As a part of her postdoc, she is working with Alessandra Lanzara to construct a new system to combine high-intensity, tailored light excitation with time-resolved, angle-resolved photoemission spectroscopy (ARPES).
TIME Tuesday, October 4, 2016 at 4:00 PM - 5:00 PM
LOCATION Tech L361 Technological Institute map it
CONTACT Department Office matsci@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering
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Apr25
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Brought to you by the MSE Resource Center & MSE Finance Team
Every Mondays & Thursdays 10-11am
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-Policy & ProceduresTIME Thursday, April 25, 2024 at 10:00 AM - 11:00 AM
LOCATION 2036, Cook Hall map it
CONTACT Wade Tischhauser wade@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering (MatSci)
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Apr29
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-Policy & ProceduresTIME Monday, April 29, 2024 at 10:00 AM - 11:00 AM
LOCATION 2036, Cook Hall map it
CONTACT Wade Tischhauser wade@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering (MatSci)
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May2
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-Policy & ProceduresTIME Thursday, May 2, 2024 at 10:00 AM - 11:00 AM
LOCATION 2036, Cook Hall map it
CONTACT Wade Tischhauser wade@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering (MatSci)
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May6
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-Policy & ProceduresTIME Monday, May 6, 2024 at 10:00 AM - 11:00 AM
LOCATION 2036, Cook Hall map it
CONTACT Wade Tischhauser wade@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering (MatSci)
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May8
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lessThe Center for Scientific Studies in the Arts is a collaboration between the Art Institute of Chicago and materials science-related departments at Northwestern University to pursue objects-based and objects-inspired scientific research. Materials research benefits ongoing work in conservation, archaeology, art history, and curatorial scholarship.
Learn how the Center uses materials research to care for art objects in sustainable, innovative ways with Maria Kokkori, Senior Scientist in the Center for Scientific Studies in the Arts. She will be in conversation with Corey Byrnes, Northwestern Associate Professor of Chinese Culture and co-founder/co-director of the Environmental Humanities Workshop in Kaplan Humanities Center.
This event is presented by the McCormick School of Engineering and Applied Science in conjunction with exhibition Actions for the Earth: Art, Care & Ecology.
TIME Wednesday, May 8, 2024 at 6:00 PM - 7:30 PM
LOCATION Block Museum of Art, Mary and Leigh map it
CONTACT Block Museum of Art block-museum@northwestern.edu EMAIL
CALENDAR Block Museum of Art
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May9
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-Policy & ProceduresTIME Thursday, May 9, 2024 at 10:00 AM - 11:00 AM
LOCATION 2036, Cook Hall map it
CONTACT Wade Tischhauser wade@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering (MatSci)
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May13
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-Policy & ProceduresTIME Monday, May 13, 2024 at 10:00 AM - 11:00 AM
LOCATION 2036, Cook Hall map it
CONTACT Wade Tischhauser wade@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering (MatSci)
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May16
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-Policy & ProceduresTIME Thursday, May 16, 2024 at 10:00 AM - 11:00 AM
LOCATION 2036, Cook Hall map it
CONTACT Wade Tischhauser wade@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering (MatSci)
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May20
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-Policy & ProceduresTIME Monday, May 20, 2024 at 10:00 AM - 11:00 AM
LOCATION 2036, Cook Hall map it
CONTACT Wade Tischhauser wade@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering (MatSci)
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May23
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-Policy & ProceduresTIME Thursday, May 23, 2024 at 10:00 AM - 11:00 AM
LOCATION 2036, Cook Hall map it
CONTACT Wade Tischhauser wade@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering (MatSci)
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May27
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-Policy & ProceduresTIME Monday, May 27, 2024 at 10:00 AM - 11:00 AM
LOCATION 2036, Cook Hall map it
CONTACT Wade Tischhauser wade@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering (MatSci)
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May30
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-Policy & ProceduresTIME Thursday, May 30, 2024 at 10:00 AM - 11:00 AM
LOCATION 2036, Cook Hall map it
CONTACT Wade Tischhauser wade@northwestern.edu EMAIL
CALENDAR Department of Materials Science and Engineering (MatSci)
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Jun10
EVENT DETAILSmore info
lessMcCormick School of Engineering PhD Hooding and Master’s Degree Recognition Ceremony
TIME Monday, June 10, 2024 at 9:00 AM - 11:00 AM
LOCATION Welsh-Ryan Arena
CONTACT Amy Pokrass amy.pokrass@northwestern.edu EMAIL
CALENDAR McCormick School of Engineering and Applied Science
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Jun10
TIME Monday, June 10, 2024 at 2:00 PM - 4:00 PM
LOCATION Welsh-Ryan Arena
CONTACT Amy Pokrass amy.pokrass@northwestern.edu EMAIL
CALENDAR McCormick School of Engineering and Applied Science