Many-body effects in the population dynamics of terahertz quantum cascade lasers

Wang, F; Guo, Xiaolu; Cao, Jiafeng

doi:10.1103/physrevb.81.045308

Cited by 7 publications

(9 citation statements)

References 19 publications

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“…In the investigation of the many-body effects, we found the induced oscillations after the 2p pulse pumping were more apparent than that after the p pulse pumping. 8 So, compared to the p pulse, we consider the 2p pulse as the more stronger disturbance that can induce a greater impact on the electron distribution. With the results shown in Figs.…”

Section: Results Of the Optical Pump-probe Processmentioning

confidence: 99%

“…3 The electron transport simulation of the active region plays an important role in the device development. [4][5][6][7][8][9] However, due to the complexity of the cascade structure, the electron transport simulation in the terahertz QCL is challenging. Currently, most simulations adopt the cyclic boundary approximation and the electron system is closed.…”

Section: Introductionmentioning

confidence: 99%

“…8,9 The optical pump-probe process was an important tool of investigating the coherent electron transport through the cascade structures. And the investigations focused on the recovery process.…”

Section: Introductionmentioning

confidence: 99%

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Multi-metastable states induced by the optical pump-probe process in terahertz quantum cascade lasers

Wang

Guo

Wang

et al. 2014

Journal of Applied Physics

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The optical pump-probe process in terahertz quantum cascade lasers is studied theoretically by using the open system simulation method. The emitter injection is considered and the charge neutrality in the active region is broken. We find that nonequilibrium oscillations may appear in the recovery processes. In particular, the formation of different equilibrium values of the population change after the periodic pulse pumping is observed clearly. Here, the phenomenon of multi-metastable states stems from the electron regulation by the emitter injection. Finally, we discuss the important impacts of the equilibrium stabilization time and obtain an in-depth understanding of the emitter injection.

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Section: Results Of the Optical Pump-probe Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multi-metastable states induced by the optical pump-probe process in terahertz quantum cascade lasers

Wang

Guo

Wang

et al. 2014

Journal of Applied Physics

Self Cite

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show abstract

“…E t is the optical pulse with a widely used hyperbolic secant functional form. 9 We suppose the frequency of the pump laser field coupled into the QCL waveguide along the growth direction is 3.75 THz. In our calculation, we ignore the parasitic coupling and collection coupling because the energy detuning is far from the anticrossing gap at the design bias 14.4 kV/cm in these two cases.…”

Section: A Terahertz Qclmentioning

confidence: 99%

“…We have reported the importance of many-body effects on the gain recovery of terahertz QCL pumped by an intense laser field. 9 However, so far the many-body interaction in resonant tunneling of terahertz QCLs that would affect the population dynamics has received little attention. 10 It is well known that the time-resolved study is a useful approach to investigate the ultrafast population dynamics in semiconductor optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%