Physica E: Low-dimensional Systems and Nanostructures

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Structural and electronic properties of GaP nanowires

Rezek Mohammad, Şenay Katırcıoğlu

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 213-219

Structural stability and electronic properties of bare and hydrogenated GaP nanowires in zinc-blende and wurtzite phases have been investigated using first-principles calculations based on density functional theory. It is determined that relaxation of the hydrogenated GaP nanowires is very small compared to that of their bare ones. The wurtzite structural hydrogenated GaP nanowires are found more...

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Optically stimulated optical effects in the ZnO:Tm nanorods

A. Aloufy, J. Ebothé, N. Dumelié, I. Chaki, more

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 96-99

We have performed the studies of photoinduced second harmonic generation in the ZnO nanorods doped by Thulium with different content (0.1; 0.2;0.5% of Tm). The illumination was performed with the Er:glass laser emitting at 1540nm wavelength of the 10ns laser and the output second harmonic generation (SHG) was studied. The AFM data analysis was performed. The role of the rare earth Tm ions on the morphology...

article

Derivation of a universal estimate for the stiffness of carbon nanotubes

Ghasem Ghadyani, Andreas Öchsner

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 116-125

An algorithm has been developed based on numerical simulation to relate physical geometry to the Young’s modulus of symmetric and asymmetric single-walled carbon nanotubes (SWCNTs). A large number of finite element results for the stiffness of SWCNTs has been categorized into three main classes (i.e., armchair, zigzag and chiral) and the best curve fitting function has been obtained to describe the...

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Electronic properties of Boron Nitride sheet and nanotube in the presence of transverse magnetic field

H. Rezania, Z. Aghaiimanesh

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 100-104

We study the effects of a transverse magnetic field on the electronic properties of both Boron-Nitride monolayer and zigzag nanotubes in the context of Hubbard model at the antiferromagnetic sector. In particular, the behavior of density of states and temperature dependence of specific heat have been investigated. Mean field approximation has been employed in order to obtain the electronic spectrum...

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Angular dependent study on spin transport in magnetic semiconductor heterostructures with Dresselhaus spin–orbit interaction

S.M. Mirzanian, A.A. Shokri, K. Mikaili Agah, S.M. Elahi

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 220-225

We investigate theoretically the effects of Dresselhaus spin–orbit coupling (DSOC) on the spin-dependent current and shot noise through II–VI diluted magnetic semiconductor/nonmagnetic semiconductor (DMS/NMS) barrier structures. The calculation of transmission probability is based on an effective mass quantum-mechanical approach in the presence of an external magnetic field applied along the growth...

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Electronic thermal conduction in suspended graphene

K Rizwana Begum, N.S. Sankeshwar

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 27-34

The electronic thermal conductivity (ETC), κ_e, of suspended graphene (SG) is studied for 15<T<400K, following the Boltzmann transport formalism. The electrons are considered to be scattered from defects along with the intrinsic in-plane acoustic phonons, out-of-plane flexural phonons (FPs) and optical phonons. The ETC is evaluated by computing the first-order perturbation distribution function...

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Asymmetric functionalization as a promising route to open the band gap of silicene: A theoretical prediction

Nan Wang, Hao Guo, Yue-jie Liu, Jing-xiang Zhao, more

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 21-26

Recent studies have suggested that chemical functionalization is a promising avenue to tailor the band gap of silicene, which plays an important role on widening its application. Here, we propose a new route to functionalize silicene, that is asymmetrically modification of silicene (Janus silicene or X–silicene–Y), which is produced by co-grafting of two different groups (X and Y) on both sides of...

article

Characterization of photonic nanojets in dielectric microdisks

Cheng-Yang Liu, Chien-Jung Chen

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 226-234

The direct imaging of photonic nanojets in different dielectric microdisks illuminated by a laser source is reported. The SiO₂ and Si₃N₄ microdisks are of height 650nm with diameters ranging from 3μm to 8μm. The finite-difference time-domain calculation is used to execute the numerical simulation for the photonic nanojets in the dielectric microdisks. The photonic nanojet measurements are performed...

article

Editorial Board

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > IFC

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Electronic structures and magnetic properties in Cu-doped two-dimensional dichalcogenides

Ai-Ming Hu, Ling-ling Wang, Wen-Zhi Xiao, Bo Meng

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 69-75

We explore the electronic structures and magnetic properties in Cu-doped MX₂ (=MoS₂, MoSe₂, MoTe₂, and WS₂) based on density functional theory. A Cu dopant leads to a net moment of 5.0 or 1.0μ_B in MX₂, which mainly depend on the size of crystal-field splitting relative to that of the spin splitting. No magnetism is observed in Cu-doped MoTe₂. The local distortion around the Cu atom reduces the total...

article

Influence of one CO molecule on structural and electronic properties of monatomic Cu chain

Ying-Ni Duan, Jian-Min Zhang, Xiao-Xi Fan, Ke-Wei Xu

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 89-95

By using first-principles calculations, we have systematically investigated the structural and electronic properties of an infinite linear monatomic Cu chain with an adsorbed CO molecule. We find that the bridge geometry is energeticabsally favored not only when the Cu–Cu bond below the molecule is unstretched, but also for a wide range of d_Cu–Cu up to about 4.20Å, while the substitutional geometry...

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Tuned electronic, optical and mechanical properties of pristine and hetero nanotubes of group IV elements (C, Si and Ge)

Surjeet Kumar Chandel, Arun Kumar, Raman Sharma, P.K. Ahluwalia

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 54-62

Density functional theory has been used to investigate the structural, electronic, optical and mechanical properties of pristine nanotubes of carbon, silicon, germanium and their hetero nanotubes having armchair conformation with chirality (6,6). In the pristine nanotubes it is found that the cohesive energy per atom is more for CNT as compared to other nanotubes under investigation. However, in hetero...

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PEG-20000 assisted hydrothermal synthesis of hierarchical ZnO flowers: Structure, growth and gas sensor properties

Weiwei Guo, Xiaodan Li, Huafeng Qin, Zhongchang Wang

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 163-168

The hierarchically structured materials usually show improved physical and chemical properties. Here, using simple hydrothermal method and reagents of polyethylene glycol (PEG-20000), we synthesize the ZnO crystals and find that they exhibit hierarchical flower-like architectures assembled by nanorods. Further comparative studies demonstrate that PEG provides nucleation sites for the assembling of...

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Pump-probe optical response of an asymmetric double quantum dot molecule

Spyridon G. Kosionis, Emmanuel Paspalakis

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 126-134

We study the interaction of an asymmetric double semiconductor quantum dot molecule with a weak probe field and a strong pump field. We show that the optical properties of the system are controlled by a gate voltage and the pump field. For example, we find that the application of the pump field leads to controlled probe absorption, optical transparency, and gain for weak tunneling rates, while for...

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Optical Kerr effect exhibited by carbon nanotubes and carbon/metal nanohybrid materials

C. Torres-Torres, C. Mercado-Zúñiga, C.L. Martínez-González, H. Martínez-Gutiérrez, more

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 156-162

Structural modification of carbon nanotubes in combination with metallic nanoparticles is reported. An enhancement in the nonlinear optical refraction of multi-wall carbon nanotubes by the incorporation of platinum nanoparticles was observed. Comparative results were analyzed taking into account the participation of single-wall carbon nanotubes that originate a decrease in the nonlinear optical response...

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Fano resonances in high energy electron transport in nanowires of variable cross-section

L.M. Baskin, M.M. Kabardov, N.M. Sharkova

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 181-188

Electron ballistic transport in 2D quantum waveguide with two narrowings is considered. For longitudinal electron motion such narrowings play the role of effective potential barriers and conditions for resonant tunneling arise. If the electron energy is sufficiently high the electron wave can scatter into different quantum states (transverse channels of the leads) which results in complicated E-dependence...

article

The electronic and magnetic properties of B-doping Stone–Wales defected graphene decorated with transition-metal atoms

Qingxiao Zhou, Zhibing Fu, Chaoyang Wang, Yongjian Tang, more

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 257-261

The geometry, electronic, and magnetic properties of transition-metal (TM) atoms adsorbed on the Stone–Wales (SW) defected graphene with or without B-doped were investigated by the first-principles density functional theory (DFT), aiming to study the effect of a combination of B-dopant and SW-defect on the adsorption of TM-adatoms on graphene. It was found that the introducing of B-dopant enhanced...

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Accurate analysis of electron transfer from quantum dots to metal oxides in quantum dot sensitized solar cells

Mohammad Javad Fahimi, Davood Fathi, Mehdi Ansari-Rad

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 148-155

Electron transfer rate from quantum dot (QD) to metal oxide (MO) in quantum dot sensitized solar cells (QDSSCs) has an important role in the efficiency. In this work, we analyse the electron transfer rate from CdSe, CdS and CdTe QDs to TiO₂, ZnO and SnO₂ MOs by extending the related equations with considering various effects, based on the Marcus theory. In this regard, the effects of QD diameter,...

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Study of growth of dot and column in porous silicon samples of various thicknesses prepared at a constant current density

Fateh Singh Gill, Varij Panwar, Himanshu Gupta, G.S. Kalra, more

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 110-115

Porous silicon is considered to be composed either of spherical shaped interconnected silicon quantum dots or combination of quantum dots and columns. This paper presents a study of a series of porous silicon films of various thicknesses, prepared at a 20mA current density by the electrochemical etching technique. The photoluminescence spectra of the series samples were monitored. Further, we used...

article

Substitutional impurity in the graphene quantum dots

K. Sierański, J. Szatkowski

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 73 > Complete > 40-44

The process of formation of the localized defect states due to substitutional impurity in sp²-bonded graphene quantum dot is considered using a simple tight-binding-type calculation. We took into account the interaction of the quantum dot atoms surrounding the substitutional impurity from the second row of elements. To saturate the external dangling sp² orbitals of the carbon additionally 18 hydrogen...

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Physica E: Low-dimensional Systems and Nanostructures

Structural and electronic properties of GaP nanowires

Optically stimulated optical effects in the ZnO:Tm nanorods

Derivation of a universal estimate for the stiffness of carbon nanotubes

Electronic properties of Boron Nitride sheet and nanotube in the presence of transverse magnetic field

Angular dependent study on spin transport in magnetic semiconductor heterostructures with Dresselhaus spin–orbit interaction

Electronic thermal conduction in suspended graphene

Asymmetric functionalization as a promising route to open the band gap of silicene: A theoretical prediction

Characterization of photonic nanojets in dielectric microdisks

Editorial Board

Electronic structures and magnetic properties in Cu-doped two-dimensional dichalcogenides

Influence of one CO molecule on structural and electronic properties of monatomic Cu chain

Tuned electronic, optical and mechanical properties of pristine and hetero nanotubes of group IV elements (C, Si and Ge)

PEG-20000 assisted hydrothermal synthesis of hierarchical ZnO flowers: Structure, growth and gas sensor properties

Pump-probe optical response of an asymmetric double quantum dot molecule

Optical Kerr effect exhibited by carbon nanotubes and carbon/metal nanohybrid materials

Fano resonances in high energy electron transport in nanowires of variable cross-section

The electronic and magnetic properties of B-doping Stone–Wales defected graphene decorated with transition-metal atoms

Accurate analysis of electron transfer from quantum dots to metal oxides in quantum dot sensitized solar cells

Study of growth of dot and column in porous silicon samples of various thicknesses prepared at a constant current density

Substitutional impurity in the graphene quantum dots

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