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Wen-Xing Yang,1,2,* Ai-Xi Chen,3,4 Ray-Kuang Lee,2 and Ying Wu5 1Department of Physics, Southeast University, Nanjing 210096, China 2Institute of Photonics Technologies, National Tsing-Hua University, Hsinchu 300, Taiwan 3Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122, Australia 4Department of Applied(More)
We propose a graphene-based full valley- and spin-polarization device based on strained graphene with Rashba spin orbit coupling and magnetic barrier. The underlying mechanism is the coexistence of the valley and single spin band gaps in a certain Fermi energy. By aligning the Fermi energy in the valley and single spin band gaps, remarkable valley- and(More)
Wen-Xing Yang,1,2,* Ai-Xi Chen,3 Liu-Gang Si,4 Kaijun Jiang,5 Xiaoxue Yang,4 and Ray-Kuang Lee2 1Department of Physics, Southeast University, Nanjing 210096, People’s Republic of China 2Institute of Photonics Technologies, National Tsing-Hua University, Hsinchu 300, Taiwan 3Department of Applied Physics, School of Basic Science, East China Jiaotong(More)
Received June 13, 2012; revised August 17, 2012; accepted August 27, 2012; posted August 28, 2012 (Doc. ID 170277); published September 24, 2012 We analyze the hybrid absorptive-dispersive optical bistability (OB) behavior in an open Λ-type three-level atomic system by using a microwave field to drive the hyperfine transition between two lower states, along(More)
We propose and analyze an efficient way to enhance four-wave mixing (FWM) signals in a four-subband semiconductor quantum well via Fano-type interference. By using Schrödinger-Maxwell formalism, we derive explicitly analytical expressions for the input probe pulse and the generated FWM field in linear regime under the steady-state condition. With the aid of(More)
We study ultrafast excitonic population inversion resulting from the interaction of a semiconductor quantum dot (SQD) with localized surface plasmons. The plasmonic enhanced fields are generated when a metallic nanoparticle (MNP) is subject to a nonlinear chirped few-cycle pulse train. By numerically solving the time-dependent Bloch equations beyond the(More)
We conducted a theoretical investigation of the optical steady-state behavior in N four-level Y-type atoms driven coherently by a probe laser and a single elliptically polarized field (EPF) bymeans of a unidirectional ring cavity. It was found that the optical bistability can be observed for a wide regime of frequency detuning of the probe field, intensity(More)
We theoretically investigate the valley precession and valley polarization in graphene under inter-valley coupling. Our results show that the inter-valley coupling can induce valley polarization in graphene and also precess valleys in real space in a manner similar to the Rashba spin-orbit interaction rotating spins. Moreover, using strain modulation, we(More)
We show the effect of squeezed vacuum on laser-induced grating in a weak standing-wave-driving two-level atomic system. Using the optical Bloch equation and the Floquet harmonic expansion, we obtain the linear response of the medium with respect to the probe field, which determines the transmission spectrum and diffraction intensity. At the presence of the(More)