title: Tunneling induced absorption with competing Nonlinearities.
abstract: We investigate tunneling induced nonlinear absorption phenomena in a coupled quantum-dot system. Resonant tunneling causes constructive interference in the nonlinear absorption that leads to an increase of more than an order of magnitude over the maximum absorption in a coupled quantum dot system without tunneling. Resonant tunneling also leads to a narrowing of the linewidth of the absorption peak to a sublinewidth level. Analytical expressions show that the enhanced nonlinear absorption is largely due to the fifth-order nonlinear term. Competition between third- and fifth-order nonlinearities leads to an anomalous dispersion of the total susceptibility.
authors.affiliation: State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China.
authors.forename: Yandong
authors.initials: Y
authors.lastname: Peng
authors.affiliation: State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China.
authors.forename: Aihong
authors.initials: A
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Physics Research Laboratory, Shanghai Publishing and Printing College, University of Shanghai for Science and Technology, Shanghai, 200093, China.
authors.forename: Hongju
authors.initials: H
authors.lastname: Guo
authors.affiliation: State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China.
authors.forename: Tingqi
authors.initials: T
authors.lastname: Ren