20.500.12556/RUL-113037 Diffusive transport in a quasiperiodic Fibonacci chain: absence of many-body localization at weak interactions We study high-temperature magnetization transport in a many-body spin-1/2 chain with on-site quasiperiodic potential governed by the Fibonacci rule. In the absence of interactions it is known that the system is critical with the transport described by a continuously varying dynamical exponent (from ballistic to localized) as a function of the on-site potential strength. Upon introducing weak interactions, we find that an anomalous noninteracting dynamical exponent becomes diffusive for any potential strength. This is borne out by a boundary-driven Lindblad dynamics as well as unitary dynamics, with agreeing diffusion constants. This must be contrasted to a random potential where transport is subdiffusive at such small interactions. Mean-field treatment of the dynamics for small U always slows down the noninteracting dynamics to subdiffusion, and is therefore unable to describe diffusion in an interacting quasiperiodic system. Finally, briefly exploring larger interactions we find a regime of interaction-induced subdiffusive dynamics, despite the on-site potential itself having no “rare regions.” condensed matter physics fizika kondenzirane snovi true false false Angleški jezik Slovenski jezik Neznano 2019-11-29 14:22:33 2019-11-29 14:22:33 2022-08-25 03:52:23 0000-00-00 00:00:00 2019 0 0 Str. 085105-1-085105-14 iss. 8 Vol. 100 2019 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 538.9 2469-9950 10.1103/PhysRevB.100.085105 3389284 2997348 RAZ_Varma_Vipin_Kerala_2019.pdf RAZ_Varma_Vipin_Kerala_2019.pdf 1 0CD2C2DFD30A89D87CBF2BBD9CCC13BB 0ed4eea45521d38bc3dc7173c9960a682927b596beb0b5a94796dd8155fafe20 02be0de7-a1b8-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=124997 https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.085105 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=140302 Fakulteta za matematiko in fiziko 0 0 0