Pub Date : 2023-01-30DOI: 10.15625/0868-3166/17451
Thanh-Binh Nguyen, Khamla Boudkhamchampa, Thị Trang Bùi, Minh Hung Dang
The functionalized process refers to a new concept, which aims to modify the physical and chemical properties of the original surface for specific purposes. Hence, the functional surfaces will introduce the desired properties that can not be found in the original material. The various applications might be named liquid repellent, anti-icing, anti-reflection, water harvesting, anti-biofouling, etc. This study proposes a simple and fast fabrication method based on etching incorporated with low surface energy chemical compound coating to functionalize the Iron (Fe) surface for omniphobic and anti-icing characteristics. After being functionalized, the surface reveals an omniphobic state with various liquids and extremely low adhesion to ice bulk. The research might suggest solutions for manufacturing functional surfaces oriented to outdoor applications such as windshields, rearview mirrors, anti-fouling surfaces, etc
{"title":"Facile Approach for Omniphobic and Anti-icing on Fe Surface","authors":"Thanh-Binh Nguyen, Khamla Boudkhamchampa, Thị Trang Bùi, Minh Hung Dang","doi":"10.15625/0868-3166/17451","DOIUrl":"https://doi.org/10.15625/0868-3166/17451","url":null,"abstract":"The functionalized process refers to a new concept, which aims to modify the physical and chemical properties of the original surface for specific purposes. Hence, the functional surfaces will introduce the desired properties that can not be found in the original material. The various applications might be named liquid repellent, anti-icing, anti-reflection, water harvesting, anti-biofouling, etc. This study proposes a simple and fast fabrication method based on etching incorporated with low surface energy chemical compound coating to functionalize the Iron (Fe) surface for omniphobic and anti-icing characteristics. After being functionalized, the surface reveals an omniphobic state with various liquids and extremely low adhesion to ice bulk. The research might suggest solutions for manufacturing functional surfaces oriented to outdoor applications such as windshields, rearview mirrors, anti-fouling surfaces, etc","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"147 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86115159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-21DOI: 10.15625/0868-3166/17513
Hong Phuoc Phan, V. Le, V. Nguyen, D. Nguyen, V. Nguyen, Ngoc Viet Nguyen, V. Nguyen
Enhanced gas sensing properties of hematite (alpha)-Fe2O3 by loaded reduced graphene oxides (RGO) have attracted considerable attention. In this study, RGO-loaded (alpha)-Fe2O3 nanofibers were fabricated via the facile electrospinning method and subsequent calcination process. The scanning electron microscopy (SEM) images showed that RGO-loaded (alpha)-Fe2O3 nanofibers with diameters of 50-100 nm have typical morphologies of spider nets. The X-ray diffraction (XRD) patterns revealed the rhombohedral structure of the RGO-loaded α-Fe2O3 nanofibers. The energy dispersive X-ray spectroscopy (EDS) results exhibited the presence of Fe, O, and C elements in the synthesized nanofibers. The gas sensing results also confirmed that the sensors based on RGO-loaded (alpha)-Fe2O3 nanofibers could be applied for detecting ethanol gas.
{"title":"The Design of Hetero-nanojunction of RGO/(alpha)-Fe(_2)O(_3) Nanofibers for Ethanol Gas Sensor","authors":"Hong Phuoc Phan, V. Le, V. Nguyen, D. Nguyen, V. Nguyen, Ngoc Viet Nguyen, V. Nguyen","doi":"10.15625/0868-3166/17513","DOIUrl":"https://doi.org/10.15625/0868-3166/17513","url":null,"abstract":"Enhanced gas sensing properties of hematite (alpha)-Fe2O3 by loaded reduced graphene oxides (RGO) have attracted considerable attention. In this study, RGO-loaded (alpha)-Fe2O3 nanofibers were fabricated via the facile electrospinning method and subsequent calcination process. The scanning electron microscopy (SEM) images showed that RGO-loaded (alpha)-Fe2O3 nanofibers with diameters of 50-100 nm have typical morphologies of spider nets. The X-ray diffraction (XRD) patterns revealed the rhombohedral structure of the RGO-loaded α-Fe2O3 nanofibers. The energy dispersive X-ray spectroscopy (EDS) results exhibited the presence of Fe, O, and C elements in the synthesized nanofibers. The gas sensing results also confirmed that the sensors based on RGO-loaded (alpha)-Fe2O3 nanofibers could be applied for detecting ethanol gas.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"116 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80705603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-03DOI: 10.15625/0868-3166/17434
B. Thuy, Hoang Trinh Xuan, Manh Le Duy, Yen Nguyen Thi Hai
We study the escape process of nascent proteins at the ribosomal exit tunnel of bacterial Escherichia coli by using molecular dynamics simulations with coarse-grained and atomistic models. It is shown that the effects of hydrophobic and electrostatic interactions on the protein escape at the E. coli's tunnel are qualitatively similar to those obtained previously at the exit tunnel of archaeal Haloarcula marismortui, despite significant differences in the structures and interactions of the ribosome tunnels from the two organisms. Most proteins escape efficiently and their escape time distributions can be fitted to a simple diffusion model. Attractive interactions between nascent protein and the tunnel can significantly slow down the escape process, as shown for the CI2 protein. Interestingly, it is found that the median escape times of the considered proteins (excluding CI2) strongly correlate with the function (N_h + 5.9 Q) of the number of hydrophobic residues, (N_h), and the net charge, (Q), of a protein, with a correlation coefficient of 0.958 for the E. coli's tunnel. The latter result is in quantitative agreement with a previous result for the H. marismortui's tunnel.
{"title":"Effects of Hydrophobic and Electrostatic Interactions on the Escape of Nascent Proteins at Bacterial Ribosomal Exit Tunnel","authors":"B. Thuy, Hoang Trinh Xuan, Manh Le Duy, Yen Nguyen Thi Hai","doi":"10.15625/0868-3166/17434","DOIUrl":"https://doi.org/10.15625/0868-3166/17434","url":null,"abstract":"We study the escape process of nascent proteins at the ribosomal exit tunnel of bacterial Escherichia coli by using molecular dynamics simulations with coarse-grained and atomistic models. It is shown that the effects of hydrophobic and electrostatic interactions on the protein escape at the E. coli's tunnel are qualitatively similar to those obtained previously at the exit tunnel of archaeal Haloarcula marismortui, despite significant differences in the structures and interactions of the ribosome tunnels from the two organisms. Most proteins escape efficiently and their escape time distributions can be fitted to a simple diffusion model. Attractive interactions between nascent protein and the tunnel can significantly slow down the escape process, as shown for the CI2 protein. Interestingly, it is found that the median escape times of the considered proteins (excluding CI2) strongly correlate with the function (N_h + 5.9 Q) of the number of hydrophobic residues, (N_h), and the net charge, (Q), of a protein, with a correlation coefficient of 0.958 for the E. coli's tunnel. The latter result is in quantitative agreement with a previous result for the H. marismortui's tunnel.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88326302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-03DOI: 10.15625/0868-3166/17360
D. H. Nguyen, Tuyen M. Pham, Thien D. Le, Tuan Q. Do
In this paper, we would like to figure out whether a {it k}-inflation model admits the Bianchi type I metric as its inflationary solution under a constant-roll condition in the presence of the supergravity motivated coupling between scalar and vector fields, (f^2(phi)F_{munu}F^{munu}). As a result, some novel anisotropic inflationary solutions are shown to appear along with a power-law one in this scenario. Furthermore, these solutions are numerically confirmed to be attractive, in contrast to the prediction of the Hawking's cosmic no-hair conjecture.
{"title":"Anisotropic Constant-roll (k)-inflation Model","authors":"D. H. Nguyen, Tuyen M. Pham, Thien D. Le, Tuan Q. Do","doi":"10.15625/0868-3166/17360","DOIUrl":"https://doi.org/10.15625/0868-3166/17360","url":null,"abstract":"In this paper, we would like to figure out whether a {it k}-inflation model admits the Bianchi type I metric as its inflationary solution under a constant-roll condition in the presence of the supergravity motivated coupling between scalar and vector fields, (f^2(phi)F_{munu}F^{munu}). As a result, some novel anisotropic inflationary solutions are shown to appear along with a power-law one in this scenario. Furthermore, these solutions are numerically confirmed to be attractive, in contrast to the prediction of the Hawking's cosmic no-hair conjecture.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88217211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-03DOI: 10.15625/0868-3166/17301
Vivian H. Lam, Hoang Giang Nguyen, Van Hoa Nguyen, Minh Phi Nguyen, Thi-Thu-Yen Tran
By using MD simulation method, this study shows the influences of cooling rates on the solidifying temperature of water inside a single-wall-carbon-nanotube under different ambient pressures when cooling the systems from 300 K down to 200 K. Our results showed that the more rapid cooling rate of the systems creates more disruptive and dramatic phase transitions. Moreover, we also found that the lower of pressures correlates to the more dramatic phase transitions of water, regardless of cooling rate. This study generally provides more insight into water behavior in the SWCNT with variations in ambient conditions.
{"title":"In Silico Study of the Influences of Cooling Rates on the Phase Transition of Water Inside the Carbon Nanotube under Different Ambient Pressures","authors":"Vivian H. Lam, Hoang Giang Nguyen, Van Hoa Nguyen, Minh Phi Nguyen, Thi-Thu-Yen Tran","doi":"10.15625/0868-3166/17301","DOIUrl":"https://doi.org/10.15625/0868-3166/17301","url":null,"abstract":"By using MD simulation method, this study shows the influences of cooling rates on the solidifying temperature of water inside a single-wall-carbon-nanotube under different ambient pressures when cooling the systems from 300 K down to 200 K. Our results showed that the more rapid cooling rate of the systems creates more disruptive and dramatic phase transitions. Moreover, we also found that the lower of pressures correlates to the more dramatic phase transitions of water, regardless of cooling rate. This study generally provides more insight into water behavior in the SWCNT with variations in ambient conditions.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86169420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-03DOI: 10.15625/0868-3166/17244
Tuan Hoang Anh, Thi-Huong Nguyen, D. Le
We apply the coherent potential approximation to study the three-component Falicov - Kimball model, in which single-component and two-component fermionic particles are mixed in an optical lattice. In the model, the heavy single-component fermionic particles are localized while the light two-component fermionic particles can hop in the lattice. At half-filling, two transitions from an insulator via a metallic state to a Mott insulator are found with increasing the particle correlations. By contrast, at third-filling, only one transition from the metallic state to the Mott insulating phase is observed for strong repulsive interactions. Our results are consistent with those obtained by the dynamical mean field theory as well as by the slave boson mean field approach.
{"title":"Metal-insulator Transitions in Three-component Falicov-Kimball Model within Coherent Potential Approximation","authors":"Tuan Hoang Anh, Thi-Huong Nguyen, D. Le","doi":"10.15625/0868-3166/17244","DOIUrl":"https://doi.org/10.15625/0868-3166/17244","url":null,"abstract":"We apply the coherent potential approximation to study the three-component Falicov - Kimball model, in which single-component and two-component fermionic particles are mixed in an optical lattice. In the model, the heavy single-component fermionic particles are localized while the light two-component fermionic particles can hop in the lattice. At half-filling, two transitions from an insulator via a metallic state to a Mott insulator are found with increasing the particle correlations. By contrast, at third-filling, only one transition from the metallic state to the Mott insulating phase is observed for strong repulsive interactions. Our results are consistent with those obtained by the dynamical mean field theory as well as by the slave boson mean field approach.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86313793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-03DOI: 10.15625/0868-3166/17457
Cam-Tu Le, N. Phan, DinhDuy Vu, C. Ngo, Van-Hoang Le
It has been known that the broadband of continuum harmonics, a regular periodicity or a wide smooth range, is essential for generating attosecond pulses. However, the high-order rescatterings of electrons (HOR) can significantly affect this important part of high-order harmonic spectra. In the present work, we apply the method suggested in our previous studies to limit the HOR effect on the continuum harmonics by using up-chirped pulses with frequency increasing in time to regulate the high-order harmonic generation of an asymmetric molecule such as CO subjected to a near-infrared laser. To do so, we numerically calculate the high-order harmonic spectra using the time-dependent wave functions obtained within the framework of the single-active electron approximation. To analyze and regulate the HOR effect, we use the time-frequency analysis together with the kinetic energy maps obtained from the equation of electron motion in the laser electric field. These techniques reveal the high-order harmonic dynamics, especially the effect of chirped pulse on the manifestation of continuum harmonics. Based on this, we release the notice on choosing appropriate parameters to obtain the optimal continuum range of harmonics. Although the detailed analysis is given for the CO molecule, the method suggested is applicable for other polar molecules.
{"title":"Regulation of Continuum Harmonic Generation by Using Near-infrared Chirped Pulses","authors":"Cam-Tu Le, N. Phan, DinhDuy Vu, C. Ngo, Van-Hoang Le","doi":"10.15625/0868-3166/17457","DOIUrl":"https://doi.org/10.15625/0868-3166/17457","url":null,"abstract":"It has been known that the broadband of continuum harmonics, a regular periodicity or a wide smooth range, is essential for generating attosecond pulses. However, the high-order rescatterings of electrons (HOR) can significantly affect this important part of high-order harmonic spectra. In the present work, we apply the method suggested in our previous studies to limit the HOR effect on the continuum harmonics by using up-chirped pulses with frequency increasing in time to regulate the high-order harmonic generation of an asymmetric molecule such as CO subjected to a near-infrared laser. To do so, we numerically calculate the high-order harmonic spectra using the time-dependent wave functions obtained within the framework of the single-active electron approximation. To analyze and regulate the HOR effect, we use the time-frequency analysis together with the kinetic energy maps obtained from the equation of electron motion in the laser electric field. These techniques reveal the high-order harmonic dynamics, especially the effect of chirped pulse on the manifestation of continuum harmonics. Based on this, we release the notice on choosing appropriate parameters to obtain the optimal continuum range of harmonics. Although the detailed analysis is given for the CO molecule, the method suggested is applicable for other polar molecules.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88810184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-22DOI: 10.15625/0868-3166/17379
N. Do, Dinh Trong Tran, Tien Thanh Kim, D. Pham, Hee-Seok Lee, Guinyun Kim
The yield ratios of high to low spin states of the 196m,gAu, 186m,gIr, and 183m,gOs isomeric pairs produced by 197Au(γ,xnyp) reactions with a bremsstrahlung end-point energy of 2.5 GeV have been measured. Measurements were performed by the activation method in combination with off-line γ-ray spectrometry. The induced activity of the studied radionuclides was derived from the photo-peak area of the selected γ-ray after making the necessary corrections. The isomeric yield ratios obtained in this work are the first measurement. The relationships between the yield ratios of studied isomeric pairs with the value of high spin states, the spin difference between the high spin states and the target nucleus, and the number of nucleons emitted from the target nucleus are discussed.
{"title":"Yield Ratios of Isomeric Pairs (^{196m,g})Au, (^{186m,g})Ir, and (^{183m,g})Os in the (^{197})Au((gamma,xnyp)) Reactions with 2.5 GeV Bremsstrahlung","authors":"N. Do, Dinh Trong Tran, Tien Thanh Kim, D. Pham, Hee-Seok Lee, Guinyun Kim","doi":"10.15625/0868-3166/17379","DOIUrl":"https://doi.org/10.15625/0868-3166/17379","url":null,"abstract":"The yield ratios of high to low spin states of the 196m,gAu, 186m,gIr, and 183m,gOs isomeric pairs produced by 197Au(γ,xnyp) reactions with a bremsstrahlung end-point energy of 2.5 GeV have been measured. Measurements were performed by the activation method in combination with off-line γ-ray spectrometry. The induced activity of the studied radionuclides was derived from the photo-peak area of the selected γ-ray after making the necessary corrections. The isomeric yield ratios obtained in this work are the first measurement. The relationships between the yield ratios of studied isomeric pairs with the value of high spin states, the spin difference between the high spin states and the target nucleus, and the number of nucleons emitted from the target nucleus are discussed.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90587078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-15DOI: 10.15625/0868-3166/17137
V. H. Mai, Chi Dung Duong, H. Le, L. Tran, A. Jaffré, Emmanuel Blanc, O. Schneegans
In an Erbium-doped glass laser resonator, parasitic light oscillations (yielding a lowering of the output laser beam power) may be avoided by deposition of well-adapted antireflection coatings on the edges of the active glass medium. However, towards laser application, efficient double-layers are scarce in literature. Here, we propose a simple design of double-layer (total thickness < 490nm) composed of thin films of MgF2 and Al2O3, materials that are easy to deposit by electron beam evaporation. Such coating design allows a calculated reflectance to be lower than 0.01% in the considered 1530-1570nm Near-Infrared range.
{"title":"Simple Design of Double-Layer Antireflection Coating for Er-Doped Glass Laser Application","authors":"V. H. Mai, Chi Dung Duong, H. Le, L. Tran, A. Jaffré, Emmanuel Blanc, O. Schneegans","doi":"10.15625/0868-3166/17137","DOIUrl":"https://doi.org/10.15625/0868-3166/17137","url":null,"abstract":"In an Erbium-doped glass laser resonator, parasitic light oscillations (yielding a lowering of the output laser beam power) may be avoided by deposition of well-adapted antireflection coatings on the edges of the active glass medium. However, towards laser application, efficient double-layers are scarce in literature. Here, we propose a simple design of double-layer (total thickness < 490nm) composed of thin films of MgF2 and Al2O3, materials that are easy to deposit by electron beam evaporation. Such coating design allows a calculated reflectance to be lower than 0.01% in the considered 1530-1570nm Near-Infrared range.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87591779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-06DOI: 10.15625/0868-3166/17046
Thi Loan Nguyen, H. Drouhin, N. Hoai
This paper investigates spin-current transport in a GaMnAs/GaAs/GaMnAs magnetic semiconductor tunnel junctions under applied bias voltages. The 30-band k.p approach is used to describe the materials within the heterostructure, incorporating both spin-orbit and exchange interactions. We use the transfer-matrix formalism to derive numerical solutions for the wave functions. At specific bias values, we calculate the polarization of the spin-current component along the z direction of the structure. We show oscillations of the two spin-current components perpendicular to the magnetization with equal polarization amplitude and characteristic period. The polarization amplitude varies around 10%, reflecting the typical polarization in such type of material. The oscillation period - which relates to the Larmor frequency for spin precession - increases with the bias voltage values.
{"title":"Spin-current in a Magnetic Semiconductor Tunnel Junction: Effect of External Bias Voltage","authors":"Thi Loan Nguyen, H. Drouhin, N. Hoai","doi":"10.15625/0868-3166/17046","DOIUrl":"https://doi.org/10.15625/0868-3166/17046","url":null,"abstract":"This paper investigates spin-current transport in a GaMnAs/GaAs/GaMnAs magnetic semiconductor tunnel junctions under applied bias voltages. The 30-band k.p approach is used to describe the materials within the heterostructure, incorporating both spin-orbit and exchange interactions. We use the transfer-matrix formalism to derive numerical solutions for the wave functions. At specific bias values, we calculate the polarization of the spin-current component along the z direction of the structure. We show oscillations of the two spin-current components perpendicular to the magnetization with equal polarization amplitude and characteristic period. The polarization amplitude varies around 10%, reflecting the typical polarization in such type of material. The oscillation period - which relates to the Larmor frequency for spin precession - increases with the bias voltage values.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84709173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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