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X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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DTSTART;TZID=America/Vancouver:20220113T100000
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SUMMARY:Claire Donnelly: Three-dimensional nanomagnetism: from textures in the bulk to 3D magnetic nanostructures
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961\nPasscode: 113399 \n  \n\nSpeaker: \nClaire Donnelly\, Max Planck Institute for Chemical Physics of Solids \n  \nAbstract: \nThree dimensional magnetic systems promise significant opportunities for applications\, for example providing higher density devices [1] and new functionalities associated with complex topology and greater degrees of freedom [2\,3]. \n  \nWith the recent development of three-dimensional imaging techniques\, it is now possible to map internal three-dimensional magnetic structures\, and their response to external excitations. In this way we have observed three-dimensional vortex structures\, as well as Bloch point singularities [4\,5] and\, more recently\, nanoscale magnetic vortex rings [6\,7]. \n  \nIn addition to the static magnetic structure\, the dynamic response of the 3D magnetic configuration to excitations is key to our understanding of both fundamental physics\, and applications. With our recent development of X-ray magnetic laminography [5]\, it is now possible to determine the magnetisation dynamics of a three-dimensional magnetic system [5]. \n  \nAs well as observing magnetic textures within the “bulk”\, recent advances in nanofabrication make possible the fabrication of complex 3D magnetic nanostructures [8]. In this way we have realised magnetic double helices [9]\, which host highly coupled domain wall pairs that in turn lead to textures in the magnetic induction [9]. These offer not only a potential route to domain wall processing\, but also for the patterning of nanotextures in the magnetic field. \n  \nThese new experimental capabilities for 3D magnetic systems open the door to complex three-dimensional magnetic structures\, and their dynamic behaviour. \n  \nReferences: \n[1] Parkin et al.\, Science 320\, 190 (2008) \n[2] Fernández-Pacheco et al.\, Nat. Comm. 8\, 15756 (2017) \n[3] Donnelly and Scagnoli\, J. Phys. D: Cond. Matt. 32\, 213001 (2020). \n[4] Donnelly et al.\, Nature 547\, 328 (2017). \n[5] Donnelly et al.\, Nature Nanotechnology 15\, 356 (2020). \n[6] Cooper\, PRL. 82\, 1554 (1999). \n[7] Donnelly et al.\, Nat. Phys. 17\, 316 (2020) \n[8] Skoric et al.\, Nano Lett. 20\, 184 (2020). \n[9] Donnelly et al.\, Nature Nanotechnology (2021) https://doi.org/10.1038/s41565-021-01027-7 . \n  \nBiography: \nFollowing her MPhys at the University of Oxford\, Claire went to Switzerland to carry out her PhD studies at the Paul Scherrer Institute and ETH Zurich. She was awarded her PhD in 2017 for her work on 3D systems\, which was recognised by a number of prizes including the APS Richard Greene Dissertation Award\, the Werner Meyer-Ilse Memorial Award\, the ETH Medal\, and the SPS Award for Computational Physics. After a postdoc at the ETH Zurich\, she moved to the University of Cambridge and the Cavendish Laboratory as a Leverhulme Early Career Research Fellow\, where she was awarded the L’Oreal For Women In Science Fellowship\, and the European Magnetism Association Young Scientist Award. Since September 2021 she is a Lise Meitner Group Leader of Spin3D at the Max Planck Institute for Chemical Physics of Solids in Dresden\, Germany.
URL:https://qmi.miffanytark.com/event/claire-donnelly/
CATEGORIES:CM Seminar
ORGANIZER;CN="Kaho Saito":MAILTO:kaho.saito@ubc.ca
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DTSTART;TZID=America/Vancouver:20220120T100000
DTEND;TZID=America/Vancouver:20220120T110000
DTSTAMP:20220106T005046Z
CREATED:20220106T005046Z
LAST-MODIFIED:20220106T005046Z
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SUMMARY:Christoph Renner: Electronic Vortex Core Structure of a d-Wave High Temperature Superconductor
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961\nPasscode: 113399 \n  \n\nSpeaker \nChristoph Renner\, Vice-Dean\, Faculty of Science at University of Geneva \n  \nAbstract:\nHigh temperature superconductivity (HTS) in copper oxides keeps challenging our understanding. Among the outstanding puzzles is the electronic structure of the Abrikosov vortex cores. The fundamental excitations bound to magnetic vortices in type-II superconductors carry information about essential properties of the superconducting state. Their proper identification is therefore of prime interest to elucidate the mechanism driving HTS. We will review recent vortex core studies and present new scanning tunneling microscopy data [1] at low magnetic field\, which unveil the d wave electronic structure of the vortex core predicted by Wang and MacDonald in 1995 [2]. We show that previously reported unconventional electronic structures\, including the checkerboard charge order in the vortex halo and the absence of a zero-bias conductance peak at the vortex center\, are direct consequences of short inter-vortex distance and consequent vortex-vortex interactions prevailing in earlier experiments done at significantly higher field. The remarkable change of the spectroscopic footprint of the vortex cores we find between 0.16 Tesla and 3 Tesla is surprising for such a low energy scale and calls for further investigations. \n  \n[1] Gazdic\, T.\, et al.\, arXiv:2103.05994\, 2021. \n[2] Y. Wang and A. H. MacDonald\, Physical Review B 52\, R3876 (1995). \n  \nBiography: \nChristoph Renner is professor of physics at the department of quantum matter physics at the University of Geneva\, Switzerland. He is leading a research group investigating electronic ground states and their interplay in low dimensional correlated electron systems using scanning probe microscopy and spectroscopy. Prior to joining Geneva in 2006\, he was appointed senior and then principal research fellow at University College London (UCL)\, with affiliations in the London Centre for Nanotechnology (LCN)\, the Department of Physics & Astronomy\, and the Department of Medicine. During his time in London\, he was also a business fellow of the London Technology Network. Before moving to UCL\, he held a visiting scientist position at the NEC Research Institute in Princeton. \n  \nWith over 30 years of experience\, Prof. Renner is an expert in developing and applying variable temperature scanning tunnelling microscopy to study correlated electron materials\, in particular superconducting\, charge ordered and low dimensional systems. His research is published in leading academic journals and has been selected as a physics highlight of 2017 by the editors of Physics. Currently\, his team is focusing on high temperature superconductors and spectroscopy of tuneable electronic properties in transition metal dichalcogenides and devices by means of strain\, space charge doping and thickness. Among recent scientific successes are the observation of the intrinsic vortex core signature expected for a superconductor whose gap has d-wave symmetry\, the link between CDW contrast inversion in STM images and the CDW gap well below the Fermi level\, and the exposure of a multiband CDW in a transition metal dichalcogenide. \n  \nInterested in public outreach\, Prof. Renner was founding director of the Physiscope of the University of Geneva between 2007 and 2017. Since 2014\, he is a founding member and president of the Scienscope\, an initiative introducing junior and high school children as well as the public to science in a hands-on and entertaining manner. Prof. Renner is also actively promoting collaborations with industry\, founding member and president of the Laboratory for Advanced Technology\, a gateway supporting innovation by facilitating industry access to the competences and equipment at the University of Geneva. He was vice president of the physics section (2011-2014) and\, since 2014\, he is vice dean for innovation and infrastructures of the Faculty of Science of the University of Geneva. \n  \nProf. Renner holds a PhD degree from the University of Geneva. He received the Jean Würth award for best PhD Thesis and the IBM award of the Swiss Physical Society. As hobbies\, he enjoys piloting\, travelling and cooking.
URL:https://qmi.miffanytark.com/event/christoph-renner/
CATEGORIES:CM Seminar
ORGANIZER;CN="Kaho Saito":MAILTO:kaho.saito@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20220127T100000
DTEND;TZID=America/Vancouver:20220127T110000
DTSTAMP:20220120T194754Z
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SUMMARY:Jennifer Cano: Higher magic angles in twisted bilayer graphene and topological twistronics 
DESCRIPTION:https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09\nMeeting ID: 684 7017 3961\nPasscode: 113399 \n  \n\nSpeaker: Jennifer Cano\, Assistant Professor at Stony Brook University \nTitle: Higher magic angles in twisted bilayer graphene and topological twistronics \n  \nBio: Jennifer Cano is an Assistant Professor at Stony Brook University and an Affiliate Associate Research Scientist at the Flatiron Institute. She earned a PhD in physics from the University of California\, Santa Barbara\, in 2015\, and was subsequently a postdoctoral fellow at the Princeton Center for Theoretical Science. Her research is focused on the classification and realization of topological phases of matter\, ranging from strongly correlated phases with fractionalized excitations to non-interacting topological band structures. \n  \nAbstract: We present recent analytical and numerical results on the chiral model of twisted bilayer graphene and introduce a new platform for twistronic devices on the surface of a topological insulator. In the first part of the talk\, we study the flat band wavefunctions of chiral twisted bilayer graphene at higher magic angles. We show that at higher magic angles\, the wavefunctions exhibit an increasing number of zeros\, resembling quantum Hall wavefunctions at higher Landau levels. Zeros of the same chirality cluster near the center of the moire unit cell\, causing an enhanced phase winding and circulating current. The wavefunctions at higher magic angles have signatures in scanning tunneling microscopy and orbital magnetization experiments. In the second half of the talk\, we investigate the fate of the surface Dirac cone of a three-dimensional topological insulator subject to a superlattice potential. Using a combination of diagrammatic perturbation theory\, lattice model simulations\, and ab initio calculations\, we report a dramatic renormalization of the surface Dirac cone velocity and the formation of gapless satellite Dirac cones. The latter can produce very flat bands that may be a fruitful place to searching for interaction-driven physics.
URL:https://qmi.miffanytark.com/event/jennifer-cano/
CATEGORIES:CM Seminar
ORGANIZER;CN="Kaho Saito":MAILTO:kaho.saito@ubc.ca
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