Kardar-Parisi-Zhang universality in a two-component driven diffusive model Pritha Dolai International Centre for Theoretical Sciences, Shivakote, Hesaraghatta Hobli, Bengaluru 560089, India E-mail: pritha.dolai@icts.res.in Aditi Simha‡ Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India Abhik Basu Condensed Matter Physics Division, Saha Institute of Nuclear Physics, Calcutta 700064, West Bengal, India E-mail: abhik.123@gmail.com, abhik.basu@saha.ac.in Abstract. We elucidate the universal spatio-temporal scaling properties of the time- dependent correlation functions in a two-component one-dimensional (1D) driven diffusive system that consists of two coupled asymmetric exclusion process. By using a perturbative renormalization group framework, we show that the relevant scaling exponents have values same as those for the 1D Kardar-Parisi-Zhang (KPZ) equation. We thus establish that the model belongs to the 1D KPZ universality class. Keywords: Two lane model, universal spatio-temporal scaling, Kardar-Parisi-Zhang (KPZ) universality class, dynamic renormalization group method. Contents 1 Introduction 2 2 Two species model 3 3 Kardar-Parisi-Zhang equation 3 4 Continuum equations of motion for the two-species model 3 ‡ Deceased arXiv:2012.12210v1 [cond-mat.stat-mech] 22 Dec 2020