Matrix product state simulations of quantum quenches and transport in Coulomb blockaded superconducting devices

Abstract

Superconducting devices subject to strong charging energy interactions and Coulomb blockade are one of the key elements for the development of nanoelectronics and constitute common building blocks of quantum computation platforms and topological superconducting setups. The study of their transport properties is non-trivial and some of their non-perturbative aspects are hard to capture with the most ordinary techniques. Here we present a matrix product state approach to simulate the real-time dynamics of these systems. We propose a study of their transport based on the analysis of the currents after quantum quenches connecting such devices with external leads. Our method is based on the combination of a Wilson chain construction for the leads and a mean-field BCS description for the superconducting scatterers. In particular, we employ a quasiparticle energy eigenbasis which greatly reduces their entanglement growth and we introduce an auxiliary degree of freedom to encode the device total charge. This approach allows us to treat non-perturbatively both their charging energy and coupling with external electrodes. We show that our construction is able to describe the Coulomb diamond structure of a superconducting dot with subgap states, including its sequential tunneling and cotunneling features. We also study the conductance zero-bias peaks caused by Majorana modes in a blockaded Kitaev chain, and compare our results with common Breit-Wigner predictions.

Time-Dependent Density Matrix Renormalization Group Method for Quantum Transport with Phonon Coupling in Molecular Junction

“…We further presented a general picture for carrier transport in organic semiconductors combining DMRG and the Kubo formula with the Holstein–Peierls model , featuring both inter- and intramolecular vibrational couplings and applied its algorithm to calculate the thermoelectric power factor . There have been theoretical works to calculate electron transport of molecular junction using DMRG ,− without considering the electron phonon interactions. In this work, we develop an algorithm to study a general model of vibrationally coupled electron transport in molecular junctions, based on time-dependent DMRG, at both zero and finite temperature.…”