Personal tools
/ Research / Condensed Matter Physics / QMD Seminars / Inching Past the Dynamical Sign Problem: Real-Time Diagrammatic Monte Carlo for Dissipative Quantum Dynamics

Inching Past the Dynamical Sign Problem: Real-Time Diagrammatic Monte Carlo for Dissipative Quantum Dynamics

— filed under: ,
Date and time Nov 11, 2019
from 11:10 AM to 12:00 PM
Location 60 St. George Street, MP 606
Host Arun Paramekanti/Dvira Segal

Hsing-Ta Chen

University of Pennsylvania

The exact description of real-time dynamics in many-body quantum systems continues to provide major challenges, especially for strongly correlated electronic systems and dissipative condensed phase charge and energy transfer problems. While the imaginary-time diagrammatic Quantum Monte Carlo (dQMC) method has proven efficient and accurate for obtaining thermodynamic properties, the realtime version of the dQMC method has been plagued by the dynamical sign problem, causing the computational cost to scale exponentially with increasing time. Recently, to overcome this problem, the “inchworm algorithm” has been developed to optimally recycle diagrammatic information and enable exact real-time simulation of many-body quantum dynamics. In this talk, I will introduce variants of
the inchworm dQMC method for dissipative quantum dynamics and discuss the benefits and drawbacks, as compared to other numerically exact approaches. This talk will provide an overview of my past work in this area with some thoughts on future directions.

QMD-seminar-image

Contact Name
Document Actions