Novel quantum Monte Carlo approach to tackle frustrated spin systems

Date

Jun 6, 2023

Time

11:00 AM - 12:00 PM

Speaker

Dr. Toshihiro Sato

Affiliation

IFW Dresden / ITF

Language

en

Main Topic

Materialien

Host

Grit Rötzer

Description

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

Last modified: Jun 6, 2023, 7:35:51 AM