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DTSTART;TZID=Europe/Berlin:20250610T160000
DTEND;TZID=Europe/Berlin:20250610T170000
DTSTAMP:20260424T205829
CREATED:20250328T140451Z
LAST-MODIFIED:20250605T154220Z
UID:5012-1749571200-1749574800@www.trr360.de
SUMMARY:TRR 360 Seminar: Randomness\, disorder and compromises in magnetic systems Ellen Fogh
DESCRIPTION:Randomness\, disorder and compromises in magnetic systems \nProf. Dr. Ellen Fogh \nTechnical University of Munich \n  \nThe interplay between randomness\, disorder and frustration in magnetic systems may bring about interesting ground states and behaviours. Many real materials display intrinsic inhomogeneity\, as a result of impurities or (counter)ion substitution\, that results in site or bond disorder. This is known as quenched randomness\, and the loss of translational symmetry it entails makes the system challenging to study theoretically. However\, quenched randomness in magnetic systems can lead to specific ground states with no long-ranged order\, including glassy states and the random-singlet state but also various long-range ordered states. Some of these phases of matter are closely related to certain types of quantum spin liquids and thus raise the question of whether randomness in a frustrated system can produce qualitatively different types of quantum coherence\, as opposed to only destroying such coherence. Here\, I discuss three specific cases of how randomness and disorder have profound consequences for physical behaviour of such magnetic systems. \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-tba-ellen-fogh/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250617T140000
DTEND;TZID=Europe/Berlin:20250617T150000
DTSTAMP:20260424T205829
CREATED:20250615T173245Z
LAST-MODIFIED:20250615T180740Z
UID:5347-1750168800-1750172400@www.trr360.de
SUMMARY:TRR 360 Seminar: Some exotic phases for spin-1/2 on the triangular lattice Sylvain Capponi
DESCRIPTION:Some exotic phases for spin-1/2 on the triangular lattice \nProf. Dr. Sylvain Capponi \nLaboratoire de Physique Théorique\, Université de Toulouse\, CNRS\, UPS\, France \n  \nThe triangular lattice is at the origin of magnetic frustration both for Ising or Heisenberg models\, as shown by Wannier and Anderson respectively. Hence it is a natural testbed to stabilize unconventional phases of matter. In this talk\, I will present two recent numerical studies discussing \n(i) the possibility of a Dirac spin liquid in the J1-J2 Heisenberg model [1](ii) the possibility of a supersolid phase in the XXZ model [2] and its relevance to recent scattering experiments on K2Co(SeO3)2 \n  \n[1] A. Wietek\, S. Capponi\, and A. Läuchli\, Phys. Rev. X 14\, 021010 (2024)[2] S. Capponi and A. Läuchli\, in preparation \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-some-exotic-phases-for-spin-1-2-on-the-triangular-lattice-sylvain-capponi/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250624T160000
DTEND;TZID=Europe/Berlin:20250624T170000
DTSTAMP:20260424T205829
CREATED:20250617T095009Z
LAST-MODIFIED:20250617T095011Z
UID:5378-1750780800-1750784400@www.trr360.de
SUMMARY:TRR 360 Seminar: Effect of disorder in a frustrated system Mayukh Majumder
DESCRIPTION:Effect of disorder in a frustrated system \nDr. Mayukh Majumder \nDepartment of Physics\, Shiv Nadar University\, India \n  \nDisorder is unavoidable in any real-life quantum many-body system. Though in several cases\, the disorder often hinders us from elucidating the actual physics of a system\, in some cases\, unusual properties can be seen\, and exotic phases can be formed due to the presence of disorder. Those interesting phases do not develop in a clean or disorder-free system. Some examples of those exotic phases include the quantum Griffiths phase near quantum criticality\, spin glass\, random spin singlet state\, etc. In the talk\, I will discuss the presence of an exotic state\, namely the random spin singlet state\, stabilized by disorder in a new Copper-based three-dimensional quantum spin liquid candidate.   \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-effect-of-disorder-in-a-frustrated-system-mayukh-majumder/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250625T140000
DTEND;TZID=Europe/Berlin:20250625T150000
DTSTAMP:20260424T205829
CREATED:20250615T175619Z
LAST-MODIFIED:20250615T180531Z
UID:5353-1750860000-1750863600@www.trr360.de
SUMMARY:TRR 360 Seminar: Signatures of fractional quantum Hall states in few-body systems Cecile Repellin
DESCRIPTION:Signatures of fractional quantum Hall states in few-body systems \nDr. Cecile Repellin \nUniversité Grenoble Alpes\, CNRS\, LPMMC\, Grenoble\, France \n  \nRealizing strongly correlated topological phases of ultracold gases is a central goal for quantum gas experiments. Due to the difficulty in preparing these phases\, ongoing experiments are focusing on ensembles of few atoms\, and the preparation of a fractional quantum Hall state of two bosonic atoms has been achieved [1]. Beyond their preparation\, the characterization of these few-body states poses a unique challenge due to their small system size. I will discuss which signatures can be used\, and show that hallmark fingerprints of fractional quantum Hall phases\, such as a quantized Hall conductivity [2]\, or chiral edge modes[3]\, can be extracted in few-particle systems through local density measurements. \n  \n[1] Léonard\, J.\, Kim\, S.\, Kwan\, J. et al.\, Realization of a fractional quantum Hall state with ultracold atoms. Nature 619\, 495–499 (2023).[2] Repellin\, C.\, Léonard\, J. and Goldman\, N.\, Chern insulators of few bosons in a box: Hall plateaus from center-of-mass drifts and density profiles. Phys. Rev. A 102\, 063316 (2020).[3] Binanti\, F.\, Goldman\, N.\, Repellin\, C\, Spectroscopy of edge and bulk collective modes in fractional Chern insulators. Phys. Rev. Research 6\, L012054 (2024). \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-signatures-of-fractional-quantum-hall-states-in-few-body-systems-cecile-repellin/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
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