Intersubband optical properties of three electrons confined in multishell quantum dots: comparison of two semiconducting compounds

Int J of Quantum Chemistry

Dong

2019

Self Cite

In this work, we study the position and momentum information entropies of multiple quantum well systems in fractional Schrödinger equations, which, to the best of our knowledge, have not so far been studied. Through a confining potential, their shape and number of wells (NOW) can be controlled by using a few tuning parameters; we present some interesting quantum effects that only appear in the fractional Schrödinger equation systems. One of the parameters denoted by the Ld can affect the position and momentum probability densities if the system is fractional (1 < α < 2). We find that the position (momentum) probability density tends to be more severely localized (delocalized) in more fractional systems (ie, in smaller values of α). Affecting the Ld on the position and momentum probability densities is a quantum effect that only appears in the fractional Schrödinger equations. Finally, we show that the Beckner Bialynicki‐Birula‐Mycieslki (BBM) inequality in the fractional Schrödinger equation is still satisfied by changing the confining potential amplitude Vconf, the NOW, the fractional parameter α, and the confining potential parameter Ld.

“…In Figure , we have compared three different systems with GaAs ( m * = 0.067 m 0 ), GaN ( m * = 0.067 m 0 ), and free electron masses. Here, we followed the ref.…”

Section: Resultsmentioning

confidence: 99%

“…However, the probability density is localized with the quantum well regions. In Figure 5, we have compared three different systems with GaAs (m* = 0.067 m 0 [53] ), GaN (m* = 0.067 m 0 [54] ), and free electron masses.…”

Section: Resultsmentioning

confidence: 99%

Quantum information entropies of multiple quantum well systems in fractional Schrödinger equations

Int J of Quantum Chemistry

Dong

2019

Self Cite

“…Among them transport properties in quantum ring under effect of spin orbit interaction [28][29], Fano effect, Aharonov-Bohm effects and persistent currents [30][31][32] are some of interesting studies. In our earlier works, we have studied the optical properties of clean [33] , two-electron [34], three electrons [35] and impurity included [36] quantum rings and dots through compact density matrix formalism in the effective mass envelop function approach. Then, by using a onedimensional tight-binding (1D-TB) model we studied the optical properties quantum rings, as a proposal, to be used in THz detection quantum devices [37].…”

Section: Introductionmentioning

confidence: 99%

Spectral tuning in quantum rings by magnetic field: detection from NIR to FIR regime

Mobini

2022

Opt Quant Electron

Self Cite

In this work, we present a quantum ring structure based on semiconducting QWs for spectral tuning in a wide IR range (1.24-103 µm) using an external magnetic field. We have used a tight binding method to investigate the optical properties of the structure. Using this method the effect of the external magnetic field on the absorption spectrum has been investigated as the post-processing method. Also, the effect of different geometrical parameters like the number of QWs, QR radius, and constructed material considered as processing methods for tuning absorption. The results show for GaAs based QR with the radius of 100/π consist of 4 QWs, absorption peak linearly increase from 100 meV (12.4 um) in LWIR regime and shift to 200 meV (6.2 um) in MIR regime with increasing external magnetic field. Also for a QR with a radius of 200/π, by changing the magnetic field different absorption peaks appear and disappear in an absorption spectrum and a multi-color detector converts to single-detector in the NIR regime. This results help experimentalist to select proper materials with optimized geometrical parameters to achieve desired wavelength for various detection applications.

Section: Introductionmentioning

confidence: 99%

Spectral Tuning In Quantum Rings By Magnetic Field: Detection From NIR To FIR Regime

Mobini

2021

Preprint

In this work, we present a quantum ring structure based on semiconducting QWs for spectral tuning in a wide IR range (1.24- 103 µm) using an external magnetic field. We have used a tight binding method to investigate the optical properties of the structure. Using this method the effect of the external magnetic field on the absorption spectrum has been investigated as the post-processing method. Also, the effect of different geometrical parameters like the number of QWs, QR radius, and constructed material considered as processing methods for tuning absorption. The results show for GaAs based QR with the radius of 100/π consist of 4 QWs, absorption peak linearly increase from 100 meV (12.4 um) in LWIR regime and shift to 200 meV (6.2 um) in MIR regime with increasing external magnetic field. Also for a QR with a radius of 200/π, by changing the magnetic field different absorption peaks appear and disappear in an absorption spectrum and a multi-color detector converts to single-detector in the NIR regime. This results help experimentalist to select proper materials with optimized geometrical parameters to achieve desired wavelength for various detection applications.