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X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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DTSTART;TZID=America/Vancouver:20230302T100000
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SUMMARY:CM Seminar: John Birkbeck – Weizmann Institute of Science: The Quantum Twisting Microscope
DESCRIPTION:John Birkbeck – Department of Condensed Matter Physics\, Weizmann Institute of Science.\nTitle: The Quantum Twisting Microscope\n \nAbstract: In this talk\, I will present a new type of scanning probe microscope\, the Quantum Twisting Microscope (QTM)\, capable of performing local quantum interference measurements at a twistable interface between two quantum materials. Its working principle is based on a unique tip made of an atomically-thin two-dimensional material. This tip allows electrons to coherently tunnel into a sample at many locations at once\, with quantum interference between these tunneling events\, making it a scanning electronic interferometer. With an extra twist degree of freedom\, our microscope becomes a momentum-resolving local probe\, providing powerful new ways to study the energy dispersions of interacting electrons. I will present various experiments performed with this microscope\, demonstrating quantum interference at room temperature\, probing the conductance of in-situ twisting interfaces\, and imaging local energy dispersions of graphene and twisted bilayer graphene. \nSpeaker Bio: I am a postdoctoral researcher working at the Weizmann Institute of Science with Prof. Shahal Ilani. I completed my Ph.D. with Prof. Andre Geim and Prof. Irina Grigorieva at the University of Manchester\, UK. My research focuses on using unique scanning probe microscopes to visualize the electronic properties of 2D materials and vdW heterostructures.
URL:https://qmi.miffanytark.com/event/cm-seminar-john-birkbeck-weizmann-institute-of-science-the-quantum-twisting-microscope/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20230316T100000
DTEND;TZID=America/Vancouver:20230316T110000
DTSTAMP:20230310T231517Z
CREATED:20230310T231517Z
LAST-MODIFIED:20230310T231517Z
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SUMMARY:CM Seminar: Frédéric Grillot – Télécom Paris/ University of New-Mexico: Semiconductor Quantum Dots
DESCRIPTION:Frédéric Grillot – Télécom Paris/ University of New-Mexico\nTitle: Semiconductor Quantum Dots \nAbstract: Semiconductor nanostructures with low dimensionality like quantum dots are one the best attractive solutions for achieving high performance photonic devices. When one or more spatial dimensions of the nanocrystal approach the de Broglie wavelength\, nanoscale size effects create a spatial quantization of carriers along with various other phenomena based on quantum mechanics. Thanks to their compactness\, great thermal stability and large reflection immunity\, semiconductor quantum dot lasers are very promising candidates for low energy consumption and isolation free photonic integrated circuits. When directly grown on silicon\, they even show a four-wave mixing efficiency much superior compared to the conventional quantum well devices. This remarkable result paves the way for achieving high-efficiency frequency comb generation from a photonic chip. Quantum dot lasers also exhibit a strong potential for applications in optical routing and optical atomic clock. Last but not least\, a quantum dot single photon source is a building block in secure communications\, and therefore can be applied to quantum information processing for applications such as quantum computers. This lecture will review the recent findings and prospects on nanostructure based light emitters made with quantum-dot technology. Many applications ranging from silicon-based integrated solutions to quantum information systems will be presented. In addition\, the lecture will highlight the importance of nanotechnologies on industry and society especially for shaping the future information and communication society. \nSpeaker Bio: Frédéric Grillot is currently a Full Professor at Télécom Paris (France) and a Research Professor at the University of New-Mexico (USA). His research interests include\, but are not limited to\, advanced quantum confined devices using III-V compound semiconductors\, quantum dots quantum dashes\, light-emitters based on intersubband transitions\, non-classical light\, nonlinear dynamics and optical chaos in semiconductor lasers systems as well as microwave and silicon photonics applications. \nProfessor Grillot has made outstanding technical contributions in photonics and optical communications. He has intensively contributed to the development of quantum dot devices enabling their utilization as future active devices with superior performance. In particular\, his recent achievements on epitaxial quantum dot lasers on silicon are crucial for the development of isolation-free integrated technologies. Among his major achievements\, he also reported the first private optical communication using mid-infrared chaotic light\, giant pulses emission in quantum cascade devices as well as multigigabits operation in the thermal atmospheric window with unipolar quantum optoelectronics. Overall\, his research is a strong input to the advancement of science and to the emerging practical applications in computer and quantum technologies\, as well as in more traditional areas such as optical communications. \nProfessor Grillot strongly contributes to promote and support the development of the general optics community. He has served diligently and successfully Optica in particular as an Associate Editor of Optics Express\, now as a Deputy Editor since September 2022. As of now\, he has published more than 130 journal articles\, 3 book chapters\, and delivered many invited talks in major international conferences and workshops. Frédéric Grillot is also a Fellow Member of the SPIE as well as a Senior Member of Optica and the IEEE Photonics Society. In 2022\, he received the IEEE Photonics Society Distinguished Lecturer Award which honors excellent speakers who have made technical\, industrial or entrepreneurial contributions to the field of photonics. \n  \nJointly organized with the IEEE Vancouver Joint Communications Chapter
URL:https://qmi.miffanytark.com/event/cm-seminar-frederic-grillot-telecom-paris-university-of-new-mexico-semiconductor-quantum-dots/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20230323T100000
DTEND;TZID=America/Vancouver:20230323T110000
DTSTAMP:20230317T210430Z
CREATED:20230317T210430Z
LAST-MODIFIED:20230317T210430Z
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SUMMARY:CM Seminar: Xie Chen – California Institute of Technology:  Fracton and Chern-Simons Theory
DESCRIPTION:Xie Chen – California Institute of Technology\nTitle: Fracton and Chern-Simons Theory \nAbstract: Fracton order describes the peculiar phenomena that point excitations in certain strongly interacting systems either cannot move at all or can only move in a lower dimensional sub-manifold. It has recently been discovered in various lattice models\, tensor gauge theories\, etc. In this talk\, we discuss how another powerful field theory framework — the 2+1D Chern-Simons (CS) gauge theory — can be used to provide new insight and explore new possibilities in 3+1D fracton order. 2+1D U(1) gauge theories with a CS term provide a simple and complete characterization of 2+1D Abelian topological orders. To study 3+1D fracton order\, we extend the theory by taking the number of component gauge fields to be infinity. In the simplest case of infinite-component CS gauge theory\, different components do not couple to each other and the theory describes a decoupled stack of 2+1D fractional Quantum Hall systems with quasi-particles moving only in 2D planes — hence a fractonic system. More interestingly\, we find that when the component gauge fields do couple through the CS term\, more varieties of fractonic orders are possible. For example\, they may describe foliated fractonic systems which extends the framework found in exactly solvable models. Moreover\, we find examples which lie beyond the foliation framework\, characterized by 2D excitations of infinite order and braiding statistics that are not strictly local. \nSpeaker Bio: Xie Chen is a Professor of Theoretical Physics at the California Institute of Technology. Dr. Chen obtained her Ph.D. degree from MIT in 2012 and was a Miller research fellow at the University of California\, Berkeley before joining Caltech in 2014. Dr. Chen is a condensed matter theorist studying emergent phenomena in strongly interacting quantum many-body systems. She received the New Horizons in Physics Prize from the Breakthrough Foundation in 2020 and was named a Simons Investigator in 2021. \n  \n(This event is virtual and can be watched at the link below or in BRIM/AMPL 311)
URL:https://qmi.miffanytark.com/event/cm-seminar-xie-chen-california-institute-of-technology-fracton-and-chern-simons-theory/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20230330T100000
DTEND;TZID=America/Vancouver:20230330T110000
DTSTAMP:20230322T162246Z
CREATED:20230322T162246Z
LAST-MODIFIED:20230322T162246Z
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SUMMARY:CM Seminar: Adina Luican-Mayer – University of Ottawa: 2D Quantum materials and devices at the atomic scale
DESCRIPTION:Adina Luican-Mayer – University of Ottawa\nTitle: 2D Quantum materials and devices at the atomic scale \nAbstract:Material systems\, devices\, and circuits\, based on the manipulation of individual charges\, spins\, and photons in solid-state platforms are key for quantum technologies. The burgeoning field of quantum two-dimensional (2D) materials presents an emerging opportunity for the development of next-generation quantum technologies\, while also pushing the boundaries of fundamental understanding in condensed matter. Our laboratory aims to create quantum functionality in 2D systems by combining fabrication and assembly techniques of 2D layers with atomically precise scanning probe microscopy. \nIn this talk\, I will focus on scanning tunnelling microscopy and spectroscopy experiments aimed at creating novel moiré structures by twisting 2D layers\, including the demonstration of reversible local response of domain wall networks in ferroelectric interfaces of marginally twisted WS2 bilayers. I will also discuss our progress in realizing quantum-confined devices in 2D semiconductors. \nSpeaker Bio: Adina Luican-Mayer is an associate professor and interim Department Chair in the Physics Department at the University of Ottawa. She received her PhD in Physics from Rutgers University (2012). Prior to joining uOttawa\, she was the Alexei Abrikosov distinguished postdoctoral fellow at the Center for Nanoscale Materials at Argonne National Laboratory. She is the recipient of uOttawa Faculty of Science Early Career Researcher of the year (2020) and Ontario Early Researcher Award (2021). Her research group focuses on uncovering the novel electronic properties of low-dimensional quantum systems using scanning probe microscopy and supporting spectroscopic techniques.
URL:https://qmi.miffanytark.com/event/cm-seminar-adina-luican-mayer-university-of-ottawa-2d-quantum-materials-and-devices-at-the-atomic-scale/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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