Electron transport in T-shaped double quantum dot structure

Abbas, Mohammed A.; Al-Badry, Lafy F.; Al-Khursan, Amin H.

doi:10.1007/s11082-021-03001-y

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…Their interesting properties are mainly due to their small sizes and their associated quantum confinement effects and, thus, can be tuned by varying the size of the QDs [18], [19]. For this reason, they have found many applications in bioimaging [20], lightemitting diodes [21], [22], solar cells [23] and SEIRA [24]. The effect of quantum confinement in a material is pronounced when the size of the particle is in the order of the de Broglie wavelength of the electrons inside this material.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale modelling and experimental measurements of absorption enhancements of biological samples using HgTe colloidal QDs

Kilany,

Sabry,

Khalil

2024

Colloidal Nanoparticles for Biomedical Applications XIX

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The use of spectroscopy in the field of biomedical science has increased in recent years. Many biological samples such as viruses and bacteria could be detected using FTIR spectroscopy in the MIR range. An important challenge arises when analyzing samples with low concentrations is that they might not be detected or accurately predicted within the capabilities of the instrument's signal-to-noise ratio. To overcome such challenge, absorption signal enhancement techniques can be used to improve the detectability of the samples. One of such techniques is the use of quantum dots (QDs) that are particles of crystal structure with sizes ranging from a few to tens of nanometers, which exhibit interesting optical properties. In this work, we apply a multi-scale modeling approach to describe the enhancement of QDs starting with an atomistic simulator to extract the absorption lines by solving Schrödinger's equation. Next, the optical constants of the QDs and biological samples are extracted using Kramer-Kronig's (KK) relations and Fresnel coefficients, followed by using Maxwell Garnett model in an effective medium approximation. Then, a transfer matrix method (TMM) is used to model layered media containing biological samples mixed with QDs. Using this theoretical description, an enhancement of about 2.5x in a transmission configuration is predicted by simulations for a sample with refractive index representing a saliva sample mixed with mercury telluride (HgTe) QDs. This model can be used to predict the enhancement of different types of QDs with different types of samples, which enhances the detection of various biological samples. Then, the QDs are synthesized experimentally using a two-step injection method. Finally, a practical measurement of the attenuated total reflection (ATR) spectrum in the range of 400-4000 cm -1 of a dried saliva sample mixed with HgTe QDs is carried showing an absorption enhancement of about 1.3x.

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Section: Introductionmentioning

confidence: 99%

Multi-scale modelling and experimental measurements of absorption enhancements of biological samples using HgTe colloidal QDs

Kilany,

Sabry,

Khalil

2024

Colloidal Nanoparticles for Biomedical Applications XIX

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“…It was established that thermoelectric properties of nanoscale transport junctions were controlled by several factors including the geometry of the linker, the specifics of its coupling to the electrodes [5][6][7][8][9][10][11][12] and interactions between traveling electrons and linker vibrations and/or environmental nuclear motions [13][14][15][16][17][18][19]. Furthermore, Seebeck coefficient may be affected by quantum interference effects [11,17,[20][21][22][23][24] and by electron photon interactions [25,26]. Under certain conditions (e.g.…”

Section: Introductionmentioning

confidence: 99%

Large enhancement of thermoelectric effects in multiple quantum dots in a serial configuration due to Coulomb interactions

Zimbovskaya¹

2022

J. Phys.: Condens. Matter

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In the present work we theoretically study Seebeck eﬀect in a set of several quantum dots in a serial conﬁguration coupled to nonmagnetic conducting electrodes. We focus on the combined eﬀect of intra-dot Coulomb interactions between electrons and the number of dots on the thermopower (S) and the thermoelectric ﬁgure of merit ( ZT ) of the considered transport junction within the Coulomb blockade regime. We show that a strong enhancement of the both S and ZT may occur when the chemical potential of electrodes is situated within the Coulomb gap in the electron transmission spectrum thus indicating a possibility of signiﬁcant increase of the eﬃciency of heat-to-electric energy conversion. The enhancement becomes more pronounced when the number of dots increases.

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Theoretical insights into tunable electronic properties of graphene quantum dots through ZnO doping

Ajeel,

Mohsin,

Shakier

et al. 2023

Chemical Physics Impact

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Electron transport in T-shaped double quantum dot structure

Cited by 3 publications

References 25 publications

Multi-scale modelling and experimental measurements of absorption enhancements of biological samples using HgTe colloidal QDs

Multi-scale modelling and experimental measurements of absorption enhancements of biological samples using HgTe colloidal QDs

Large enhancement of thermoelectric effects in multiple quantum dots in a serial configuration due to Coulomb interactions

Theoretical insights into tunable electronic properties of graphene quantum dots through ZnO doping

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