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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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DTSTART;TZID=America/Vancouver:20220303T100000
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DTSTAMP:20220228T230022Z
CREATED:20220228T230022Z
LAST-MODIFIED:20220228T230022Z
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SUMMARY:Ke Zou: Recent progress on understanding the superconductivity of bulk and monolayer FeSe
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961\nPasscode: 113399 \n\nSpeaker: Ke Zou\, Stewart Blusson Quantum Matter Institute \nAbstract: \nThe physics of high-temperature superconductors is usually governed by the interplay of the spin and charge degrees of freedom. FeSe has the simplest chemical composition among Fe-based superconductors\, yet monolayer FeSe on SrTiO3 substrate reports one of the highest superconducting transition temperatures. I will summarize the progress on understanding its superconductivity from my group and other groups in the recent couple of years. We will discuss the specific roles of charge transfer\, spin magnetic moment\, and phonon coupling in this system. \n\nF. Li\, I. Elfimov\, and G.A. Sawatzky\, “Modulation doping of the FeSe monolayer on SrTiO3”\, submitted (2022).\nC. Liu\, H. Shin\, A. Doll\, H.H. Kung\, R.P. Day\, B.A. Davidson\, J. Dreser\, G. Levy\, A. Damascelli\, C. Piamonteze\, and K. Zou\, “High-temperature superconductivity and robustness against magnetic polarization in monolayer FeSe on EuTiO3”\, npj Quantum Materials 6\, 85 (2021).\nC. Liu\, R.P. Day\, F. Li\, R.L. Roemer\, S. Zhdanovich\, S. Gorovikov\, T. Pedersen\, J. Jiang\, S. Lee\, M. Schneider\, D. Wong\, P. Dosanjh\, F.J. Walker\, C.H. Ahn\, G. Levy\, A. Damascelli\, G.A. Sawatzky\, and K. Zou\, “High-order replica bands in monolayer FeSe/SrTiO3 revealed by polarization-dependent photoemission spectroscopy”\, Nature Communications 12\, 4573 (2021).\n\nBio: Assistant Professor\, Department of Physics and Astronomy – SBQMI \n\n\n\n\n\n\nResearch Focus\nOur research interests are in the growth of complex oxide and chalcogenide films by molecular beam epitaxy and the studies of their properties and functions. We aim to achieve scientific and technological breakthroughs in new materials and new functional devices. We integrate molecular beam epitaxy synthesis with nanostructure fabrication and characterization techniques for physical and electronic structures\, to explore and control the generated properties in new materials and in new forms of materials\, such as in heterostructures and gated field-effect transistors.
URL:https://qmi.miffanytark.com/event/ke-zou-recent-progress-on-understanding-the-superconductivity-of-bulk-and-monolayer-fese/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220308T140000
DTEND;TZID=America/Vancouver:20220308T150000
DTSTAMP:20211101T210215Z
CREATED:20211101T210215Z
LAST-MODIFIED:20211101T210215Z
UID:3545-1646748000-1646751600@qmi.miffanytark.com
SUMMARY:Careers in Outreach
DESCRIPTION:Speakers: \n\nTheresa Liao\, Communications Coordinator\, Storyteller\, Department of Physics and Astronomy\, UBC\nAndrew Jamison\, Senior Manager\, Geering Up and Outreach\, UBC\nElla Meyer\, Quantum Computing Outreach Coordinator\, Geering Up\, UBC
URL:https://qmi.miffanytark.com/event/careers-in-outreach/
CATEGORIES:Student event
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220310T100000
DTEND;TZID=America/Vancouver:20220310T110000
DTSTAMP:20220302T215953Z
CREATED:20220302T215953Z
LAST-MODIFIED:20220302T215953Z
UID:4155-1646906400-1646910000@qmi.miffanytark.com
SUMMARY:Inna Vishik: Electronic Correlations and Topology across Tc in a Magnetic Weyl Semimetal
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961 \nPasscode: 113399 \n\nSpeaker: Inna Vishik\, Associate Professor in Physics and Astronomy at UC Davis \nAbstract: Co3Sn2S2 is a magnetic Weyl semimetal below its Curie temperature (Tc) of 177K. I will discuss our recent spatial and temperature-dependent angle-resolved photoemission spectroscopy (ARPES) studies in this system.  Across Tc\, we observe signatures of a topological phase transition\, but also observe changes in bulk bands which are inconsistent with a simple lifting of exchange interactions\, suggesting enhanced electronic correlations in the regime without long-range magnetic order.  I will also discuss spatial-dependent microARPES data which quantify the characteristic differences between Sn- and S- terminated surfaces. \nRef: Rossi\, Ivanov\, et al\, PRB 104\, 155115 (2021) \nBio:  Inna Vishik is an Associate Professor in Physics and Astronomy at UC Davis.  Since 2016\, her lab has been performing ARPES and ultrafast optics experiments to elucidate emergent phenomena in superconducting\, correlated\, and topological quantum materials.  Prior to this\, she received her PhD at Stanford and was subsequently a Pappalardo Postdoctoral fellow at MIT.
URL:https://qmi.miffanytark.com/event/inna-vishik-electronic-correlations-and-topology-across-tc-in-a-magnetic-weyl-semimetal/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220317T100000
DTEND;TZID=America/Vancouver:20220317T110000
DTSTAMP:20220309T185436Z
CREATED:20220309T185436Z
LAST-MODIFIED:20220309T185436Z
UID:4165-1647511200-1647514800@qmi.miffanytark.com
SUMMARY:Alexandra Navrotsky: Recent Developments in High Temperature Calorimetry
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961 \nPasscode: 113399 \n\nSpeaker: Alexandra Navrotsky – Center for Materials of the Universe (MotU) \, Arizona State University \nTitle: Recent developments in high temperature calorimetry \nAbstract: A variety of high temperature calorimetric techniques have recently advanced for application to refractory oxides and related materials. These include improvements in oxide melt solution calorimetry at temperatures up to 1500 ⁰C\, differential thermal analysis to 2500 ⁰C\, and “drop-n-catch” calorimetry to 3000 ⁰C. Used together\, these methods enable one to draw a more complete picture of phase stability\, order-disorder\, melting and crystallization\, and dissolution of solids in silicate melts. These methods will be illustrated using examples from rare earth materials chemistry. New developments in the calorimetry of chalcogenides and mixed anion materials will also be presented. The synergy among calorimetry\, first principles calculations and computations of phase diagrams will be emphasized. \nBio: Alexandra Navrotsky – Professor\, School of Molecular Sciences and School for Engineering of Matter\, Transport and Energy \nAffiliated Faculty Member\, School of Earth and Space Exploration \nDirector\, Center for Materials of the Universe
URL:https://qmi.miffanytark.com/event/alexandra-navrotsky-recent-developments-in-high-temperature-calorimetry/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220324T100000
DTEND;TZID=America/Vancouver:20220324T110000
DTSTAMP:20220316T183214Z
CREATED:20220316T183214Z
LAST-MODIFIED:20220316T183214Z
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SUMMARY:Marlou Slot: Atom by Atom and Layer by Layer: Designing and Realizing Electronic Quantum Matter
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961 \nPasscode: 113399 \n\n \nSpeaker: Marlou Slot; National Institute of Standards and Technology (NIST) – Gaithersburg\, Maryland\, United States \nTitle: Atom by Atom and Layer by Layer: Designing and Realizing Electronic Quantum Matter \nAbstract: Quantum simulators are a versatile tool to study the behavior of quantum matter in a controlled way. Elusive or complex quantum systems are simulated using accessible quantum systems that can be manipulated at will. While platforms based on\, among others\, ultracold atoms and photons are well-established\, electronic platforms are currently being developed.\nThe scanning tunneling microscope (STM) is uniquely suited to create and manipulate electronic 2D potential landscapes at will in-situ. By atomic-scale patterning of the 2D electron gas at specific metal surfaces\, the electrons can be molded into electronic lattices with nearly any geometry. In this talk\, I will present CO molecules adsorbed on a Cu(111) surface as a highly-tunable electronic quantum simulator\, in which the lattice geometry\, the orbital degree of freedom\, the dimension and the topology can be tailored [1-4]. Moving beyond the in-situ approach\, ex-situ nanofabricated twisted van der Waals devices pave the way to study electron-electron interactions in tailor-made 2D potential landscapes [5]. I will demonstrate high-resolution gate-tunable Landau level spectroscopy and signatures of correlated states in twisted double bilayer graphene\, expanding the quantum simulation toolkit from atom by atom to layer by layer. \n[1] M. R. Slot et al.\, Nat. Phys. 13\, 672 (2017)\n[2] S. N. Kempkes and M. R. Slot et al.\, Design and characterization of electrons in a fractal geometry\, Nat. Phys. 15\, 127 (2019)\n[3] M. R. Slot and S. N. Kempkes et al.\, p-Band Engineering in Artificial Electronic Lattices\, PRX 9\, 011009 (2019)\n[4] S. N. Kempkes and M. R. Slot et al.\, Robust zero-energy modes in an electronic higher-order topological insulator\, Nat. Mater. 18\, 1292 (2019)\n[5] D.M. Kennes et al.\, Moiré heterostructures as a condensed-matter quantum simulator\, Nat. Phys. 17\, 155 (2021) \nBio: Marlou Slot is a Rubicon Postdoctoral Fellow and NIST-Georgetown PREP Fellow working with Dr. Joseph Stroscio at the National Institute of Standards and Technology. She obtained her PhD from Utrecht University working with Prof. Daniel Vanmaekelbergh and Prof. Ingmar Swart. Prior to that\, she obtained her undergraduate degree from RWTH Aachen University and EPFL Lausanne and she was a research assistant at Forschungszentrum Jülich. Her research interests focus on designer quantum matter realized and/or measured using scanning probe microscopy\, including van der Waals heterostructures and in-situ patterned surfaces.
URL:https://qmi.miffanytark.com/event/marlou-slot-atom-by-atom-and-layer-by-layer-designing-and-realizing-electronic-quantum-matter/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220331T100000
DTEND;TZID=America/Vancouver:20220331T110000
DTSTAMP:20220323T181708Z
CREATED:20220323T181708Z
LAST-MODIFIED:20220323T181708Z
UID:4194-1648720800-1648724400@qmi.miffanytark.com
SUMMARY:Kwabena Bediako: New Twists on Chemistry and Physics in Moiré Superlattices
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961 \nPasscode: 113399 \n\nSpeaker: Kwabena Bediako\, Assistant Professor at UC Berkeley\, Dept. of Chemistry \nTitle: New twists on chemistry and physics in moiré superlattices     \nAbstract: Atomically thin or two-dimensional (2D) materials can be assembled into bespoke heterostructures to produce some extraordinary physical phenomena. Likewise\, these highly tunable materials are useful platforms for exploring fundamental questions of interfacial chemical/electrochemical reactivity. One exciting and relatively recent example is the formation of moiré superlattices from azimuthally misoriented (twisted) layers. These moiré superlattices result in flat bands that lead to an array of correlated electronic phases. However\, in these systems\, complex strain relaxation can also strongly influence the fragile electronic states of the material. Precise characterization of these materials and their properties is therefore critical to the understanding of the behavior of these novel moiré materials (and 2D heterostructures in general). In this talk\, I will discuss how spontaneous mechanical deformations (atomic reconstruction) and resultant intralayer strain fields at moiré superlattices of twisted bilayer graphene have been quantitatively imaged using 4D-STEM Bragg interferometry. I will also discuss the impact of these mechanical deformations to the electronic band structure of these moiré superlattices and the correlated electronic phases they host. The talk will then explore how various degrees of freedom that are unique to 2D materials may be used to tailor interfacial chemistry at well-defined mesoscopic electrodes and the outlook for new paradigms of functional materials for energy conversion and low-power electronic devices. \nBio: Kwabena was born in Ghana\, West Africa. He moved to the US in 2004 for his undergraduate studies in Chemistry at Calvin College\, MI\, graduating with honors in 2008. After a year working at UOP Honeywell in IL where he researched new catalysts for the petrochemical and gas processing industries\, he traveled from the Midwest to the East Coast to begin his graduate studies in Inorganic Chemistry with Prof. Daniel Nocera at MIT (and later Harvard University). His graduate research focused on structural and mechanistic studies of water splitting electrocatalysis at cobalt and nickel compounds. After receiving his Ph.D. in 2015 from Harvard University\, Kwabena began postdoctoral work in Prof. Philip Kim’s group in the Department of Physics at Harvard\, where he studied ion intercalation and quantum transport in 2D van der Waals heterostructures. In July 2018\, Kwabena joined the faculty of the UC Berkeley Department of Chemistry. Awards received include: AFOSR Young Investigator award\, ONR Young investigator award\, DOE Early Career Award\, Gordon and Betty Moore Materials Synthesis Fellow\, and CIFAR–Azrieli Global Scholar.
URL:https://qmi.miffanytark.com/event/kwabena-bediako-new-twists-on-chemistry-and-physics-in-moire-superlattices/
CATEGORIES:CM Seminar
ORGANIZER;CN="Lada Synkova":MAILTO:lada.synkova@ubc.ca
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