Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Quantum Dots, Quantum Wires, Point Contacts

TT 46.13: Vortrag

Mittwoch, 3. April 2019, 18:15–18:30, H22

Improved quantum transport calculations using the Numerical Renormalization Group — •Emma L. Minarelli and Andrew K. Mitchell — School of Physics, University College Dublin, Belfield, Dublin 4, Dublin, Ireland

Generalized quantum transport calculations, involving a mesoscopic interacting region coupled two or more leads, are essential to understand the properties and potential applications of the new generation of complex nanoelectronic devices, including semiconductor quantum dot systems and single-molecule transistors. Within linear response, the Numerical Renormalization Group (NRG) is arguably the numerical method of choice, when combined with standard techniques for quantum transport such as Kubo and Meir-Wingreen. However, these methods have practical limitations, as discussed in this talk. We describe some alternative formulations for charge and heat transport calculations within NRG, and demonstrate dramatically improved numerical accuracy over standard methods.