Tunneling induced transparency and controllable group velocity in triple and multiple quantum-dot molecules

Abstract

We analyze the interaction of a triple quantum dot molecules controlled by the tunneling coupling instead of coupling laser. A general analytic expression for the steady-state linear susceptibility for a probe-laser field is obtained and we show that the system can exhibit two transparency windows. The group velocity of the probe-laser pulse is also analyzed. By changing the tunneling couplings, two laser pulses with different central frequency can propagate with the same group velocity. And the group velocity can be as low as 300 m/s in our system. We extend our analysis to the case of multiple quantum dot molecules (the number of the quantum dots is N) and show that the system can exhibit at most N-1 transparency windows. And at most N-1 laser pulses with different central frequencies can be slowed down.

References in corpus (10)

• An electrostatically defined serial triple quantum dot charged with few electrons
• All-electronic coherent population trapping in quantum dots
• Two path transport measurements on a triple quantum dot
• All-Optical Delay of Images using Slow Light
• The 3D transport diagram of a triple quantum dot
• Two-Particle Dark State in the Transport through a Triple Quantum Dot
• Robust states in semiconductor quantum dot molecules
• Tunneling through triple quantum dots with mirror symmetry
• Suppression of Kondo screening by the Dicke effect in multiple quantum dots
• Spin-polarized currents in double and triple quantum dots driven by ac magnetic fields