Novel quantum Monte Carlo approach to tackle frustrated spin systems

Datum

06.06.2023

Zeit

11:00 - 12:00

Sprecher

Dr. Toshihiro Sato

Zugehörigkeit

IFW Dresden / ITF

Sprache

en

Hauptthema

Materialien

Host

Grit Rötzer

Beschreibung

Monte Carlo methods are exact: for a given lattice size and temperature, we obtain the correct result. However, many spin and fermion models suffer from the infamous negative sign problem that renders the computational cost exponential in the volume of the system and the inverse temperature. In this talk, we introduce a phase pinning approach in the realm of the auxiliary field quantum Monte Carlo algorithm to mitigate the severity of the sign problem inherent in Monte Carlo methods of frustrated spin models [1]. This allows one to cope with the sign problem down to experimental relevant energy scales for various frustrated magnets. Specifically, we present numerical results that directly compare with recent measurements of the rotational anisotropy of the free energy in an external magnetic field for the candidate Kitaev material, RuCl3 [2]. [1] T. Sato and F. F. Assaad, Phys. Rev. B. 104, L081106 (2021)|Phys. Rev. B. 106, 155110 (2022). [2] K. A. Modic, et al. Nature Physics (2020). .

Links

• Seminars at the IFW

Letztmalig verändert: 03.06.2023, 07:36:51