Spectral features of the tunneling-induced transparency and the Autler-Townes doublet and triplet in a triple quantum dot

Abstract

We theoretically investigate the spectral features of tunneling-induced transparency (TIT) and Autler-Townes (AT) doublet and triplet in a triple-quantum-dot system. By analyzing the eigenenergy spectrum of the system Hamiltonian, we can discriminate TIT and double TIT from AT doublet and triplet, respectively. For the resonant case, the presence of the TIT does not exhibit distinguishable anticrossing in the eigenenergy spectrum in the weak-tunneling regime, while the occurrence of double anticrossings in the strong-tunneling regime shows that the TIT evolves to the AT doublet. For the off-resonance case, the appearance of a new detuning-dependent dip in the absorption spectrum leads to double TIT behavior in the weak-tunneling regime due to no distinguished anticrossing occurring in the eigenenergy spectrum. However, in the strong-tunneling regime, a new detuning-dependent dip in the absorption spectrum results in AT triplet owing to the presence of triple anticrossings in the eigenenergy spectrum. Our results can be applied to quantum measurement and quantum-optics devices in solid systems.

Adjusting amplitude of the stored optical solitons by inter-dot tunneling coupling in triple quantum dot molecules

“…After the double quantum inter-dot tunneling couplings are considered, the nonlinear response of the system is enhanced largely. [43,44] Luo et al [45,46] also confirmed that the Kerr nonlinearity of the TQD system can dramatically be enhanced compared to that of double QD system. This means that there exhibit a series of novel nonlinear properties in TQD molecule device.…”

Near-infrared dual-wavelength plasmonic switching and digital metasurface unveiled by plasmonic Fano resonance

“…The Fano resonance (FR) is an interference phenomenon widely studied in the light-matter interaction systems, which is caused by the interference between a narrow discrete resonance and a broad spectral continuum [1][2][3]. As a universal phenomenon in optics, FR with an asymmetric profile in optical response can be observed in the plasmonic nanostructures [3,4], electromagnetic metamaterials [3,5], photonic crystals [6,7], semiconductor nanostructures [8][9][10], etc. Plasmonic FR that originates from the destructive interference between the superradiant and subradiant resonance modes with a spectrum overlapping in the metallic subwavelength nanostructures has characteristics similar to the traditional FR in the interacting quantum systems [11,12].…”

Four-Wave Mixing in Asymmetric Double Quantum Dot Molecule–Metal Nanoparticle Assemblies

“…During the last years, these interesting optical effects have attracted the scientific interest, both on an experimental, as well as on a theoretical level, in hybrid nanostructures which are composed of SQDs and MNPs [1][2][3][4][5]. The study of the Λ-type system that describes the asymmetric double-SQD system has also attracted the scientific interest of several scientists, who investigated the pump-probe response and the FWM [6,7] and as the Autler-Townes splitting and the tunneling-induced transparency [8,9]. In this work, we are interested in the study of a complex structure in which an asymmetric double-SQD molecule is coupled to an MNP.…”