title: Counterintuitive dispersion violating Kramers-Kronig relations in gain slabs.
abstract: We demonstrate the counterintuitive dispersion effect that the peaks (dips) in the gain spectrum correspond to abnormal (normal) dispersion, contrary to the usual Kramers-Kronig point of view. This effect may also lead to two unique features: a broadband abnormal dispersion region and an observable Hartman effect. These results are explained in terms of interference and boundary effects. Finally, two experiments are proposed for the potential experimental verification.
authors: Department of Physics, Zhejiang University, Hangzhou 310027, China and Institute for Quantum Science and Engineering (IQSE) and Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA and The National Center for Applied Physics, KACST, P. O. Box 6086, Riyadh 11442, Saudi Arabia.
authors: Li-Gang
authors: LG
authors: Wang
authors: Department of Physics, Zhejiang University, Hangzhou 310027, China and Beijing Computational Science Research Center, Beijing 100084, China.
authors: Lin
authors: L
authors: Wang
authors: Institute for Quantum Science and Engineering (IQSE) and Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA and The National Center for Applied Physics, KACST, P. O. Box 6086, Riyadh 11442, Saudi Arabia and Beijing Computational Science Research Center, Beijing 100084, China.
authors: M
authors: M
authors: Al-Amri
authors: Beijing Computational Science Research Center, Beijing 100084, China and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors: Shi-Yao
authors: SY
authors: Zhu
authors: Institute for Quantum Science and Engineering (IQSE) and Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA and The National Center for Applied Physics, KACST, P. O. Box 6086, Riyadh 11442, Saudi Arabia and Beijing Computational Science Research Center, Beijing 100084, China.
authors: M Suhail
authors: MS
authors: Zubairy