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DTSTART;TZID=Europe/Berlin:20240717T140000
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DTSTAMP:20260504T120121
CREATED:20240426T093629Z
LAST-MODIFIED:20240716T141411Z
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SUMMARY:TRR 360 Seminar: Discerning and mitigating complex quantum correlations in many-body dynamics Jan Budich
DESCRIPTION:Discerning and mitigating complex quantum correlations in many-body dynamics \nJan BudichTU Dresden \nThe proliferation of complex quantum correlations in many-body dynamics poses a formidable challenge both to quantum information science at a fundamental level and to classical variational approaches such as tensor network methods at a practical computational level. In this talk\, after a brief introduction to the broader field\, we discuss two of our recent contributions towards discerning various sources of quantum correlations and mitigating dynamical growth of entanglement. First\, noting that entanglement depends on how a system is partitioned into subsystems (entanglement cut)\, we explore the potential of dynamically adjusting the entanglement cut as a strategy for reducing entanglement growth. Second\, regarding the dynamics of mixed states such as locally perturbed thermal states\, we demonstrate how tools from differential geometry such as parallel transport can be harnessed to tame the temporal growth of quantum correlations in a purified state corresponding to the physical mixed state. \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-jan-budich/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
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DTSTART;TZID=Europe/Berlin:20240723T160000
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DTSTAMP:20260504T120121
CREATED:20241014T102634Z
LAST-MODIFIED:20241014T102933Z
UID:2399-1721750400-1721754000@www.trr360.de
SUMMARY:TRR 360 Seminar: Strain Tuning of Frustrated Magnets and Mott Insulators: Stress Reduces Frustration Andrej Pustogov
DESCRIPTION:Strain Tuning of Frustrated Magnets and Mott Insulators: Stress Reduces Frustration \nAndrej Pustogov TU Wien \nTuning materials properties on demand is at the heart of condensed matter science. Charge transport and magnetism are strongly linked to the overlap of electronic wave functions and can be\, thus\, manipulated by varying the electronic bandwidth through chemical substitution or physical pressure. Yet\, a controlled variation of the symmetry\, anisotropy and frustration of transfer integrals and exchange interactions remained inaccessible so far. \nHere\, we explore Mott insulators subject to strong antiferromagnetic interactions\, where geometrical frustration suppresses magnetic order entirely [1\,2] or down to very low temperatures TN << J [4\,7]. Utilizing the recent advancements in strain tuning of unconventional superconductors [8\,9]\, we apply uniaxial stress to fine-tune the Mott transition with unprecedented precision in a triangular-lattice compound [2]. Through the slope of the metal-insulator boundary in the temperature-pressure phase diagram we pinpoint the nonmagnetic ground state of the most intensely studied quantum-spin-liquid candidate [1-3]. By applying in situ uniaxial pressure to a clean\, well-studied kagome-lattice compound without disorder [4-6]\, we obtain direct control of antiferromagnetic order within one single crystal [7]. As the applied stress reduces the frustration strength\, TN is enhanced by 10% [7]. Our pioneering endeavors [2\,7] demonstrate uniaxial strain as a powerful tool to tune interacting spins on frustrated lattices – towards stabilizing novel\, exotic\, possibly even quantum entangled spin states. \n[1] B. Miksch\, A. Pustogow\, M. Javaheri Rahim\, A. A. Bardin\, K. Kanoda\, J. A. Schlueter\, R. Hübner\, M. Scheffler\, M. Dressel\, Science 372\, 276-279 (2021)[2] A. Pustogow\, Y. Kawasugi\, H. Sakurakoji\, N. Tajima\, Nat. Commun. 14\, 1960 (2023)[3] Y. Kawasugi\, S. Yamazaki\, A. Pustogow\, N. Tajima\, J. Phys. Soc. Jpn. 92\, 065001 (2023)[4] P. Puphal\, M. Bolte\, D. Sheptyakov\, A. Pustogow\, K. Kliemt\, M. Dressel\, M. Baenitz\, C. Krellner\, J.\, Mater. Chem. C 5\, 2629 (2017)[5] T. Biesner et al.\, Adv. Quantum Technol. 2022\, 2200023 (2022)[6] D. Chatterjee et al.\, Phys. Rev. B 107\, 125156 (2023)[7] Jierong Wang\, Y.-S. Su\, M. Spitaler\, K.M. Zoch\, C. Krellner\, P. Puphal\, S.E. Brown\, and A. Pustogow\, Phys. Rev. Lett. 131\, 256501 (2023)[8] C.W. Hicks et al.\, Science 344\, 283 LP (2014)[9] A. Chronister et al.\, npj Quantum Mater. 7\, 113 (2022) \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-andrej-pustogov/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
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