Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 59: Transport: Poster
TT 59.13: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster E
Zn-periodic quasiparticle pump in quantum spin helices — •Anshuman Tripathi1, Felix Gerken1,2, Peter Schmitteckert3, Mircea Trif4, Michael Thorwart1,2, and Thore Posske1,2 — 11. Institut für Theoretische Physik, Universität Hamburg, Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — 3HQS Quantum Simulations GmbH, Karlsruhe, Germany — 4International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
Various topologically degenerate spaces return to an initial state only after more than one cycle of external adiabatic manipulation, e.g., Majorana zero mode exhibits the 4π Josephson effect and more exotic anyons a higher order of cyclic periodicity. Here, we study the winding-up of easy-plane quantum spin helices in spin-1/2 chains by twisting the boundary fields. At Heisenberg anisotropy Δ = −|J|/2, the system returns to the ground state after n cycles of the adiabatic time evolution, where n increases linearly in dependence on the chain length. This unifies arbitrary periodicities in a single system and connects the winding-up to adiabatically pumped helical quantum spin quasiparticles. Extrapolation to long spin chains reveals a universal linear scaling curve. Our work also connects phantom helices to adiabatically pumped spin-current maximizing helices.
Keywords: Quantum spin dynamic; Helicoidal magnetic texture; Topological protection; Parafermion; Universality