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X-WR-CALNAME:Stewart Blusson Quantum Matter Institute
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X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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SUMMARY:CM Seminar: Signature of preformed pairs in angle-resolved photoemission spectroscopy\, Janez Bonca\, University of Ljubljana
DESCRIPTION:Speaker: Janez Bonca\, University of Ljubljana \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: We use density matrix renormalization group (DMRG) and variational exact diagonalization (VED) to calculate the single-electron removal spectral weight for the Hubbard-Holstein model at low electron densities. Tuning the strength of the electron-phonon coupling and of the Hubbard repulsion allows us to contrast the results for a liquid of polarons versus a liquid of bipolarons. The former shows spectral weight up to the Fermi energy\, as expected for a (uncorrelated) metal. The latter has a gap in its spectral weight\, set by the bipolaron binding energy\, although this is also a (strongly correlated) metal. This difference suggests that angle-resolved photoemission spectroscopy could be used to identify liquids of pre-formed pairs. Furthermore\, we show that the liquid of bipolarons is well approximated by an ensemble of bosons that are hard-core in momentum space\, filling the states inside the Fermi sea but otherwise non-interacting [1]. We have also generalized the calculation to allow for a finite optical phonon dispersion. The spectral function is significantly influenced by the dispersion\, particularly in systems with strong electron-phonon coupling. The sign of the curvature of the phonon band plays a crucial role in the distribution of spectral weight [2]. \nReferences \n• [1] K. Kovaˇc\, A. Nocera\, A. Damascelli\, J. Bonˇca\, and M. Berciu\, to appear in PRL\, arXiv:2409.14490 \n• [2] K. Kovaˇc and J. Bonˇca\, arXiv:2410.11537
URL:https://qmi.miffanytark.com/event/cm-seminar-signature-of-preformed-pairs-in-angle-resolved-photoemission-spectroscopy-janez-bonca-university-of-ljubljana/
CATEGORIES:CM Seminar
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DTSTART;TZID=America/Vancouver:20250313T100000
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DTSTAMP:20240903T221219Z
CREATED:20240903T221219Z
LAST-MODIFIED:20240903T221219Z
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SUMMARY:CM Seminar: Electron-hole atomic double layers: towards high-temperature exciton condensation\, Jie Shan\, Cornell University
DESCRIPTION:Speaker: Jie Shan\, Cornell University \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTopic: Electron-hole atomic double layers: towards high-temperature exciton condensation \nAbstract: Excitons\, bound electron-hole pairs\, in semiconductors are bosons that can form condensates. With a much smaller mass than atoms\, they have been predicted to condense at a much higher temperature scale. Although the concept has been understood for more than sixty years\, experimental realization of exciton condensates or superfluids has remained challenging. In this talk\, I will discuss our recent efforts in creating a high-density equilibrium exciton fluid in atomic double layers made of semiconducting transition metal dichalcogenides. I will present results from both thermodynamics and transport measurements that establish high-temperature excitonic insulators. I will also discuss the physics of doped excitonic insulators that can support a Bose-Fermi mixture and an equilibrium trion fluid. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-jie-shan-cornell-university/
CATEGORIES:CM Seminar
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DTSTART;TZID=America/Vancouver:20250327T100000
DTEND;TZID=America/Vancouver:20250327T110000
DTSTAMP:20240903T221412Z
CREATED:20240903T221412Z
LAST-MODIFIED:20240903T221412Z
UID:8091-1743069600-1743073200@qmi.miffanytark.com
SUMMARY:CM Seminar: Shedding nano-light on quantum materials\, Columbia University\, Dmitri Basov
DESCRIPTION:Speaker: Dmitri Basov \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: Optical spectroscopies have contributed immensely to the present understanding of metals\, semiconductors and superconductors. Unfortunately\, optics encounters problems when it comes to “seeing” effects at length scales below the diffraction limit of light and also with probing physics outside of the light cone. Both capabilities are highly desirable for the exploration of quantum physics of new quantum materials. Over the last decade or so\, our group has developed and deployed scanning-probe nano-optical methods for the nano-scale spectroscopy and imaging of complex materials. In this talk\, I will discuss our progress with the understanding of the electronic phenomena in atomically layered van der Waals (vdW) materials\, all empowered by deeply subdiffractional nano-light imaging. I will focus on two recent results: 1) Good plasmons in a bad metal: MoOCl2 is the latest addition to hyperbolic vdW materials with non-trivial electrodynamics spanning a broad range of frequencies from mid-IR to visible /Frank Ruta et al. Science 387\, 786 (2025)/; 2) vdW waveguide quantum electrodynamics: we observed notable Purcell enhancement of the spontaneous emission produced by MoTe2 monolayers integrated in WSe2 waveguides /Sam Moore et al. Nature Photonics (2025)/. \nDmitri N. Basov (PhD 1991) is a Higgins professor and Chair of the Department of Physics at Columbia University [http://infrared.cni.columbia.edu]\, the Director of the DOE Energy Frontiers Research Center on Programmable Quantum Materials [since 2018] and co-director of Max Planck Society – New York Center for Nonequilibrium Quantum Phenomena [2018-2030]. He has served as a professor (1997-2016) and Chair (2010-2015) of Physics\, University of California San Diego. Research interests include: physics of quantum materials\, superconductivity\, two-dimensional materials\, infrared nano-optics. Prizes and recognitions: Sloan Fellowship (1999)\, Genzel Prize (2014)\, Humboldt research award (2009)\, Frank Isakson Prize\, American Physical Society (2012)\, Moore Investigator (2014\, 2020)\, K.J. Button Prize (2019)\, Vannevar Bush Faculty Fellowship (U.S. Department of Defense\, 2019)\, National Academy of Sciences (2020). \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-columbia-university-dmitri-basov/
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