Electro-optical properties of phosphorene quantum dots

Saroka, V. A.; Luk’yanchuk, I.; Portnoi, M. E.; Abdelsalam, Hazem

doi:10.1103/physrevb.96.085436

Cited by 54 publications

(39 citation statements)

References 89 publications

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“…Recall that the distances between two P atoms within the sublayer and in different sublayers are 2.164 Å and 2.207 Å, respectively (see Fig.3 in ref. [12]). In order to verify the stability of the selected PQDs, we calculated their binding energies by using the following equation: E B = (N H E H +N S E S +N P E P -E C )/N.…”

Section: Resultsmentioning

confidence: 99%

Phosphorene quantum dot electronic properties and gas sensing

Abdelsalam

Saroka

Younis

2019

Physica E: Low-dimensional Systems and Nanostructures

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Density functional theory calculations are performed on phosphorene quantum dots having different shapes and edge terminations to investigate their structure stability, electronic properties, and gas sensing ability. All the selected phosphorene dots, namely hexagonal and triangular flakes with armchair and zigzag terminations, have positive binding energies which insure their stability even though the bond lengths are much longer than those in the infinite phosphorene layer. It is found that all the selected hydrogen passivated quantum dots have a wide energy gap. In contrast, the partial passivation with sulfur decreases the gap. Moreover, it transforms the system from antiferromagnetic to ferromagnetic state. The energy gap of hexagonal zigzag cluster can be additionally tuned by electric field: narrowed by about 1.7 eV for hydrogenated or broadened by 0.25 eV for partially sulfurated edges. It is shown that phosphorene quantum dots successfully adsorb H 2 S, CH 4 , CO, NH 3 gas molecules either on their edge or surface. The highest adsorption energy is obtained for NH 3 molecule, when it is placed over the surface. This adsorption is alleviated by in-plane electric field and hindered by perpendicular field.

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Section: Resultsmentioning

confidence: 99%

Phosphorene quantum dot electronic properties and gas sensing

Abdelsalam

Saroka

Younis

2019

Physica E: Low-dimensional Systems and Nanostructures

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“…[36] are given in Table I together with the distances between the corresponding sites of the lattice. In order to study the optical properties of phosphorene quantum dots we calculate their optical absorption cross sections [20,37,38]:…”

Section: Theoretical Modelmentioning

confidence: 99%

“…It is predicted that the edge states play a considerable role in PQDs electronic and optical properties. For example, PQDs can be conducting, semiconducting, or insulating depending on the applied electric and magnetic fields, shape and edge termination of the quantum dots [14,[19][20][21][22]. Recently it was shown that electron pair repulsion in black phosphorus (PB) is responsible for the peculiar edge effects and can be used in the damage-free surface functionalization of PB [23].…”

Section: Introductionmentioning

confidence: 99%

Multilayer phosphorene quantum dots in an electric field: Energy levels and optical absorption

Abdelsalam

Saroka

Luk’yanchuk

et al. 2018

Journal of Applied Physics

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Triangular and hexagonal multilayer phosphorene quantum dots with armchair and zigzag terminations are investigated with the orthogonal tight-binding model. The effect of increasing the number of layers is revealed. The obtained results show that in a small size multilayer quantum dot the edge states are as sensitive to the out-of-plane external electric fields as the edge states in a single layer dot to the in-plane external electric fields. The investigated optical absorption cross sections show that armchair phosphorene quantum dots have a regular behavior which should be useful for infrared detectors. In particular, it was found that in hexagonal armchair phosphorene dots absorption peaks can be increased, decreased, or totally removed from the low-energy region depending on the orientation of the applied electric field. The effect of spurious doping can suppress the transitions < 0.4 eV, while effect of the finite temperature is almost negligible.

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“…В [16] изучены электронные и оптические свойства однослойных квантовых точек фосфорена, имеющих различную форму. По сравнению с графеновыми квантовыми точками, в фосфореновых кластерах, имеющих одинаковую форму и размер, имеется набор граничных состояний с энергиями, расположенными вокруг уровня Ферми.…”

Section: Introductionunclassified

Резонансное Поглощение Электромагнитного Излучения В Монослое Фосфорена

Карпунин¹,

Маргулис²

2019

Журнал Технической Физики

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The absorption coefficient of the electromagnetic radiation in a phosphorene single layer placed in a magnetic field is found. A degenerate and nondegenerate electron gas is considered. The resonant dependences of the absorptance on the radiation frequency and applied magnetic field are found. Taking into account electron scattering at an ionized impurity leads to oscillation dependences of the absorption coefficient on the radiation frequency and external magnetic field. The resonance character of the absorption curve is shown. The conditions of resonances and position of resonance peaks are found.

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Electro-optical properties of phosphorene quantum dots

Cited by 54 publications

References 89 publications

Phosphorene quantum dot electronic properties and gas sensing

Phosphorene quantum dot electronic properties and gas sensing

Multilayer phosphorene quantum dots in an electric field: Energy levels and optical absorption

Резонансное Поглощение Электромагнитного Излучения В Монослое Фосфорена

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