Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Modern Physics Letters B

THE STRENGTH OF FANO INTERFERENCE EFFECTS ON THE PROBE ABSORPTION IN ASYMMETRIC SEMICONDUCTOR QUANTUM WELLS

Zhiping Wang

Published Nov 10, 2009• 1 citation
Publisher

Abstract

We investigate the strength of Fano interference effects on the probe absorption spectra in asymmetric semiconductor quantum wells driven coherently by a probe laser field. We find that the probe absorption can be dramatically reduced due to the strength of the Fano interference, and the effect of the energy splitting on the probe absorption is also discussed. Our study is much more practical than its atomic counterpart due to its flexible design and the controllable interference strength. Thus it may provide some possibilities for technological applications in optoelectronics and solid-state quantum information science.

DOI
10.1142/s0217984909021405

Related papers

Controllable Kerr Nonlinearity via Incoherent Pump Fields in Semiconductor Quantum Wells

Hamid Reza Hamedi, Mostafa Sahrai, H. Tajalli

Abstract: A theoretical investigation is carried out into the impact of incoherent pumping fields and quantum interference induced by incoherent pumping fields on the Kerr nonlinearity in a three-level asymmetric semiconductor quantum well system. It is found that Kerr nonlinearity is so sensitive to the rate of incoherent pumping fields, but insensitive to the quantum interference induced by incoherent pumping fields. In addition, it is demonstrated that an enhanced Kerr nonlinearity with reduced absorption can be achieved just via the strength of Fano- type interference and without applying any coherent laser field. The obtained results are very different from the conventional schemes which coherent coupling fields are used to control the Kerr nonlinearity. This advantages make our electronic medium much more practical than its atomic counterpart due to its flexible design and the controllable interference strength.

Quantum Physics Letters•Oct 20, 2013•1 citation

Controllable optical bistability and multistability in asymmetric quantum wells via Fano-type interference

Dong Sun, Hongjun Zhang, Hui Sun

Abstract We theoretically investigate the hybrid absorptive-dispersive optical bistability (OB) and optical multistability (OM) behaviors induced by Fano-type interference in a four-subband asymmetric semiconductor double quantum wells scheme driven by a degenerate probe field and a coherent coupling field. We show that the appearance or disappearance of OB can be controlled by modulating the strength of the Fano-type interference. We also present the threshold and hysteresis cycle of the OB can be controlled by adjusting the intensity of the coherent coupling field. Moreover, OB can be switched to OM by tuning the frequency detuning of the coherent coupling field or vice versa. This interesting scheme may provide guidance for technological applications in optoelectronics and solid-state quantum information science.

Journal of Physics B Atomic Molecular and Optical Physics•Dec 6, 2018•6 citations

Proposal of nonlinear measurement of tunneling in quantum wells with Fano interference

Chen Li, Bing Chen, Zhengmao Jia +4 more

An enhanced absorption spectrum by Fano interference is proposed to measure the tunneling between a discrete state and a continuum in asymmetric quantum wells (QWs). Interestingly, the asymmetry of the enhanced absorption spectrum is sensitive to tunneling strength, which can be used to measure the tunneling in QWs. Further study shows that the asymmetry of a nonlinear absorption spectrum is greater than that of a linear absorption spectrum, indicating better probe sensitivity. The simulation results show that the probe sensitivity based on nonlinear absorption is approximately 10 times larger than that of linear absorption. In addition, the effects of control-field intensity and detuning on probe sensitivity are evaluated.

Journal of the Optical Society of America B•Jan 24, 2020•0 citations

Transient and steady-state properties of asymmetric semiconductor quantum wells at telecom wavelength bands

Hamid Reza Hamedi

The transient and steady-state dispersion and absorption properties of a three-subband asymmetric semiconductor quantum well system are investigated. In the steady-state regime, it is shown that by increasing the strength of Fano-interference as well as enhancement of energy splitting of two excited states the slope of dispersion changes from negative to positive which is corresponding to a switch between superluminal to subluminal light propagation. At the same time, the probe absorption reduces at telecommunication wavelength λ = 1550 nm. The influence of incoherent pumping fields on time-dependent susceptibility is then discussed. It is found that due to more transfer of population to the upper levels, increasing the rate of incoherent pump field leads to the reduction of probe absorption. In addition, it is realized that incoherent pumping has a major role in converting fast to slow propagation of light at long wavelength. We also introduce an extra controllability for the light pulse to be slow downed at Telecom wavelength just through the quantum interference arising from incoherent pumping fields. The obtained results may be practical in telecommunication applications.

Journal of Experimental and Theoretical Physics Letters•Sep 1, 2014•5 citations

Switching of amplification to absorption with enhanced Kerr nonlinearity in double quantum wells via Fano interference

Rohit Mukherjee, Nitu Borgohain, Rohit Hazra

Abstract In this communication, we investigate linear and nonlinear (Kerr) responses in an asymmetric double quantum wells induced by a weak probe and controlled by a signal field under double Λ excitation via the Fano interference. By carefully tuning the control field intensities, probe detuning and relative phase of the interacting electromagnetic fields, the amplification as well as the electromagnetically induced transparency (EIT) can be achieved to an efficient level in the proposed scheme. We observe that the absorption of the probe and signal fields decrease with the decrease in the strength of the Fano interference (ξ), while the Kerr nonlinearity enhances by almost ten times, reaching a value of the order ~ 10 − 10 m 2 / V 2 under the regime of EIT. The results presented may serve as a valuable reference for designing optimized slow and fast-light, solid-based optical switching devices, offering significant advantages over those based on atomic media.

Journal of Optics•Jun 11, 2026•0 citations

Phase control of light propagation via Fano interference in asymmetric double quantum wells

Wen‐Xing Yang, Jia-Wei Lu, Zhikang Zhou +2 more

We investigate the light propagation and dynamical control of a weak pulsed probe field in asymmetric double quantum wells via Fano interference, which is caused by tunneling from the excited subbands to the same continuum. Our results show that the system can produce anomalous and normal dispersion regions with negligible absorption by choosing appropriate coupling strength of the tunneling and the Fano interference. Interesting enough, the dispersion can be switched between normal and anomalous by adjusting the relative phase between the pulsed probe and coherent control fields owing to the existence of the perfectly Fano interference. Thus, the relative phase can be regarded as a switch to manipulate light propagation with subluminal or superluminal. The temporal and spatial dynamics of the pulsed probe field with hyperbolic secant envelope are analyzed.

Journal of Applied Physics•May 27, 2014•14 citations
We investigate the strength of Fano interference effects on the probe absorption spectra in asymmetric semiconductor quantum wells driven coherently by a probe laser field. We find that the probe absorption can be dramatically reduced due to the strength of the Fano interference, and the effect of the energy splitting on the probe absorption is also discussed. Our study is much more practical than its atomic counterpart due to its flexible design and the controllable interference strength. Thus it may provide some possibilities for technological applications in optoelectronics and solid-state quantum information science.
Abstract: A theoretical investigation is carried out into the impact of incoherent pumping fields and quantum interference induced by incoherent pumping fields on the Kerr nonlinearity in a three-level asymmetric semiconductor quantum well system. It is found that Kerr nonlinearity is so sensitive to the rate of incoherent pumping fields, but insensitive to the quantum interference induced by incoherent pumping fields. In addition, it is demonstrated that an enhanced Kerr nonlinearity with reduced absorption can be achieved just via the strength of Fano- type interference and without applying any coherent laser field. The obtained results are very different from the conventional schemes which coherent coupling fields are used to control the Kerr nonlinearity. This advantages make our electronic medium much more practical than its atomic counterpart due to its flexible design and the controllable interference strength.
Abstract We theoretically investigate the hybrid absorptive-dispersive optical bistability (OB) and optical multistability (OM) behaviors induced by Fano-type interference in a four-subband asymmetric semiconductor double quantum wells scheme driven by a degenerate probe field and a coherent coupling field. We show that the appearance or disappearance of OB can be controlled by modulating the strength of the Fano-type interference. We also present the threshold and hysteresis cycle of the OB can be controlled by adjusting the intensity of the coherent coupling field. Moreover, OB can be switched to OM by tuning the frequency detuning of the coherent coupling field or vice versa. This interesting scheme may provide guidance for technological applications in optoelectronics and solid-state quantum information science.
An enhanced absorption spectrum by Fano interference is proposed to measure the tunneling between a discrete state and a continuum in asymmetric quantum wells (QWs). Interestingly, the asymmetry of the enhanced absorption spectrum is sensitive to tunneling strength, which can be used to measure the tunneling in QWs. Further study shows that the asymmetry of a nonlinear absorption spectrum is greater than that of a linear absorption spectrum, indicating better probe sensitivity. The simulation results show that the probe sensitivity based on nonlinear absorption is approximately 10 times larger than that of linear absorption. In addition, the effects of control-field intensity and detuning on probe sensitivity are evaluated.
The transient and steady-state dispersion and absorption properties of a three-subband asymmetric semiconductor quantum well system are investigated. In the steady-state regime, it is shown that by increasing the strength of Fano-interference as well as enhancement of energy splitting of two excited states the slope of dispersion changes from negative to positive which is corresponding to a switch between superluminal to subluminal light propagation. At the same time, the probe absorption reduces at telecommunication wavelength λ = 1550 nm. The influence of incoherent pumping fields on time-dependent susceptibility is then discussed. It is found that due to more transfer of population to the upper levels, increasing the rate of incoherent pump field leads to the reduction of probe absorption. In addition, it is realized that incoherent pumping has a major role in converting fast to slow propagation of light at long wavelength. We also introduce an extra controllability for the light pulse to be slow downed at Telecom wavelength just through the quantum interference arising from incoherent pumping fields. The obtained results may be practical in telecommunication applications.
Abstract In this communication, we investigate linear and nonlinear (Kerr) responses in an asymmetric double quantum wells induced by a weak probe and controlled by a signal field under double Λ excitation via the Fano interference. By carefully tuning the control field intensities, probe detuning and relative phase of the interacting electromagnetic fields, the amplification as well as the electromagnetically induced transparency (EIT) can be achieved to an efficient level in the proposed scheme. We observe that the absorption of the probe and signal fields decrease with the decrease in the strength of the Fano interference (ξ), while the Kerr nonlinearity enhances by almost ten times, reaching a value of the order ~ 10 − 10 m 2 / V 2 under the regime of EIT. The results presented may serve as a valuable reference for designing optimized slow and fast-light, solid-based optical switching devices, offering significant advantages over those based on atomic media.
We investigate the light propagation and dynamical control of a weak pulsed probe field in asymmetric double quantum wells via Fano interference, which is caused by tunneling from the excited subbands to the same continuum. Our results show that the system can produce anomalous and normal dispersion regions with negligible absorption by choosing appropriate coupling strength of the tunneling and the Fano interference. Interesting enough, the dispersion can be switched between normal and anomalous by adjusting the relative phase between the pulsed probe and coherent control fields owing to the existence of the perfectly Fano interference. Thus, the relative phase can be regarded as a switch to manipulate light propagation with subluminal or superluminal. The temporal and spatial dynamics of the pulsed probe field with hyperbolic secant envelope are analyzed.