Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Correlated Electrons: 1D Theory

TT 30.5: Vortrag

Dienstag, 2. April 2019, 15:00–15:15, H4

Phase diagram of spin-1 chains with Dzyaloshinskii-Moriya interaction — •Hugo Tschirhart¹, Ernest Teng Siang Ong², Pinaki Sengupta², and Thomas L. Schmidt¹ — ¹University of Luxembourg, Luxembourg, Luxembourg — ²Nanyang Technological University, Singapore, Singapore

We investigate an antiferromagnetic spin-1 Heisenberg chain in the presence of Dyzaloshinskii-Moriya interactions (DMI) and an external magnetic field. We study the resulting spin chain using a combination of numerical and analytical techniques. Using DMRG simulations to determine the spectral gap and the entanglement spectrum, we map out the phase diagram as a function of magnetic field strength and DMI strength. We provide a qualitative interpretation for these numerical findings by mapping the spin-1 chain on a spin-1/2 ladder and using a bosonization approach.