A derivation of the conditions under which bosonic operators exactly capture fermionic structure and dynamics

Abstract

The dynamics of many-body fermionic systems are important in problems ranging from catalytic reactions at electrochemical surfaces, to transport through nanojunctions, and offer a prime target for quantum computing applications. Here we derive the set of conditions under which fermionic operators can be exactly replaced by bosonic operators that render the problem amenable to a large toolbox of dynamical methods while still capturing the correct dynamics of the $n$-body operators. Importantly, our analysis offers a simple guide on how one can exploit these simple maps to calculate nonequilibrium and equilibrium single- and multi-time correlation functions essential in describing transport and spectroscopy. We use this to rigorously analyze and delineate the applicability of simple yet effective Cartesian maps that have been shown to correctly capture the correct fermionic dynamics in select models of nanoscopic transport. We illustrate our analytical results with exact simulations of the resonant level model. Our work provides new insights as to when one can leverage the simplicity of bosonic maps to simulate the dynamics of many-electron systems, especially those where an atomistic representation of nuclear interactions becomes essential.

arXiv comment9 pages, 2 figures main text + 7 pages appendices and references

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Cited by in corpus (4)

• A Linearized Semiclassical dynamics study of the multi-quantum vibrational relaxation of NO scattering from a Au(111) Surface
• Path Integral Monte Carlo in the Angular Momentum Basis for a Chain of Planar Rotors
• Electron transfer at electrode interfaces via a straightforward quasiclassical fermionic mapping approach
• Dynamics with Simultaneous Dissipations to Fermionic and Bosonic Reservoirs