Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 61: Ultra-cold Plasmas and Rydberg Systems II (joint session A/Q)

Q 61.4: Talk

Thursday, March 13, 2025, 15:15–15:30, HS PC

Nonlinear effects on the transport of fractional charges in quantum wires — •Flavia Braga Ramos¹, Rodrigo Gonçalves Pereira², Sebastian Eggert¹, and Imke Schneider¹ — ¹Physics Department and Research Center OPTIMAS, University of Kaiserslautern-Landau, Kaiserslautern, Germany — ²International Institute of Physics and Departamento de Física Teórica e Experimental, Universidade Federal do Rio Grande do Norte, Natal, Brazil

We investigate the transport properties of one-dimensional systems beyond linear response, focusing on the fractionalization of propagating charges. Starting from a right-moving unit charge, we predict its evolution into at least three distinct stable parts: a fractionally charged particle with freeparticle dynamics, a left-moving signal, and a right-moving low-energy excitation, which can carry positive or negative charge depending on the interaction strength and energy regime. Our findings provide deep insights into the universal correlated nature of these emergent particles and pave the way for out-of-equilibrium transport measurements, offering a direct method to extract the interaction parameters governing correlations in the system.

Keywords: Transport in Luttinger liquids; Fractional charges; Quantum chains and wires; Nonlinear effects