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DTSTART;TZID=Europe/Paris:20240910T110000
DTEND;TZID=Europe/Paris:20240910T123000
DTSTAMP:20260419T033957
CREATED:20240825T133906Z
LAST-MODIFIED:20240829T082324Z
UID:10941-1725966000-1725971400@fermi.univ-tlse3.fr
SUMMARY:Reviving Old Theories with 2D Materials. - (Ji Ung Lee/  Seminar / CEMES). - 10/09/2024\, 11H
DESCRIPTION:Séminaire invité FERMI\n \nséminaire organisé par W Bacsa \nJi Ung Lee\,  College of Nanotechnology\, Science\, and Engineering\, SUNY-Albany\, Albany\, NY. \nSummary:\nI will describe our efforts to revisit three theoretical concepts that are best demonstrated in 2D van der Waals (vdW) materials. Specifically\, I will describe experimental realizations of\, or our attempt to verify\, these theories that were predicted decades ago using novel devices. \nIn the first part of my talk\, I will describe the counterintuitive transmission of relativistic particles through a potential barrier\, known as the Klein paradox. Here\, the particles or quasiparticles are electrons that exhibit light‐like (photon‐like) characteristics in graphene. When these carriers impinge on a barrier\, they transmit as if the barrier is not present. Nonrelativistic particles\, such as electrons in a normal semiconductor\, do not behave this way. Klein predicted these properties in the early days of quantum mechanics using the Dirac equation. The discovery of graphene has allowed us to demonstrate the Klein paradox in a condensed matter system. \nIn the second part of my talk\, I will discuss Schottky barriers. A Schottky barrier forms at a metal‐semiconductor interface and is one of the fundamental devices in semiconductor technology. Ideally\, the metal work function determines the barrier height\, known as the Schottky‐Mott limit. This ideal description has been taught for decades\, even though it had not been realized experimentally ‐ until recently. Typically\, defect states form at the interface\, which pin the metal Femi level. I will describe a Schottky junction formed at a vdW interface that obeys the Schottky‐Mott rule. \nFinally\, I will describe our efforts to find Majorana zero modes (Majorana fermions). A Majorana particle is its own antiparticle. I will discuss our use of EUV patterning techniques to accomplish this. \n\n \n \n 
URL:https://fermi.univ-tlse3.fr/event/reviving-old-theories-with-2d-materials-ji-ung-lee-seminar-cemes-10-09-2024-11h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:CEMES,Events,Seminars
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DTSTART;TZID=Europe/Paris:20240910T140000
DTEND;TZID=Europe/Paris:20240910T153000
DTSTAMP:20260419T033957
CREATED:20240824T082047Z
LAST-MODIFIED:20240829T082333Z
UID:10944-1725976800-1725982200@fermi.univ-tlse3.fr
SUMMARY:Information theory bounds on randomness-based phase transitions. - (Noa Feldman / LPT / Seminar). - 10/09/2024\, 14H
DESCRIPTION:Noa Feldman(Université de Tel Aviv) \nSeminar LPT\, 10/09/2024\, 14H\, 3R1\, seminar room\, 3rd floor \nAbstract : \nWe introduce a new perspective on the connection between many-body physics and information theory. We study phase transitions in models with randomness\, such as localization in disordered systems\, or random quantum circuits with measurements. \nUtilizing information-based arguments regarding probability distribution differentiation\, rigorous results for bounds on critical exponents in such phase transitions are obtained with a minimal amount of work.\nWe first demonstrate our method by rederiving the well known Harris criterion\, bounding \noareal-space and dynamical critical exponents in the Anderson localization transition. \nWe then move to obtain new bounds on critical exponents in many-body Fock space localization transition and localization in Coulomb-interactive models. Somewhat surprisingly\, our bounds are not obeyed by previous studies of these systems\, indicating possible inadequacies in their results\, which we discuss. Finally\, we apply our method to measurement-induced phase transition in random quantum circuits\, obtaining bounds transcending recent mapping to percolation problems. \n&nbsp; \n<hr />
URL:https://fermi.univ-tlse3.fr/event/information-theory-bounds-on-randomness-based-phase-transitions-noa-feldman-lpt-seminar-10-09-2024-14h/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Seminars
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