Physica E-low-dimensional Systems & Nanostructures最新文献

GST and BFO assisted microring resonator for nanoplasmonic applications 用于纳米光子学应用的 GST 和 BFO 辅助微孔谐振器

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-11-09 DOI: 10.1016/j.physe.2024.116149

Diksha Chauhan , Zen Sbeah , Vishal Sorathiya , Amita Verma , Ram Prakash Dwivedi

引用次数: 0

Josephson and thermophase effect in interacting T-shaped double quantum dots system 相互作用的 T 型双量子点系统中的约瑟夫森效应和热相效应

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-11-08 DOI: 10.1016/j.physe.2024.116142

Bhupendra Kumar, Sachin Verma, Ajay

{"title":"Josephson and thermophase effect in interacting T-shaped double quantum dots system","authors":"Bhupendra Kumar, Sachin Verma, Ajay","doi":"10.1016/j.physe.2024.116142","DOIUrl":"10.1016/j.physe.2024.116142","url":null,"abstract":"<div><div>This article theoretically analyzes the phase and thermal driven transport properties in a T-shaped double quantum dot Josephson junction. We began by investigating the Josephson current for different on-dot Coulomb interaction on central quantum dot and interdot-tunneling between quantum dots. Josephson current exhibits <span><math><mrow><mn>0</mn><mo>−</mo><mi>π</mi></mrow></math></span> phase transition for intermediate Coulomb interaction to dot-lead coupling ratio with quantum dots energy level below the Fermi level. The Josephson current exhibits complete <span><math><mi>π</mi></math></span>-phase in doublet regime for relatively large Coulomb interaction to dot-lead coupling ratio. The interdot-tunneling destroys the <span><math><mi>π</mi></math></span> region and shifts the <span><math><mrow><mn>0</mn><mo>−</mo><mi>π</mi></mrow></math></span> transition points depending on the position of quantum dot energy levels. Further, depending on the position of central quantum dot energy level and Coulomb interaction strength, Josephson current shows Fano types symmetric and asymmetric line shapes with a Fano dip at the Fermi level of side dot. Next, we demonstrated that with increasing thermal energy, the discontinuity in the Josephson current smeared and becomes sinusoidal. Finally, the total current (Josephson current+quasi-particle current) is analyzed by applying a finite temperature biasing across the junction. The system is examined in electrically open circuit configuration, where phase driven Josephson current and thermal driven quasi-particle cancels each other, and analyze the thermophase Seebeck effect in linear response region. At the <span><math><mrow><mn>0</mn><mo>−</mo><mi>π</mi></mrow></math></span> transition points, where the Josephson current shows discontinuities, the thermal gradient produces abrupt thermophase Seebeck coefficient (TPSC) peaks, and the strength of interdot-tunneling provides great control over these abrupt TPSC peaks.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"166 ","pages":"Article 116142"},"PeriodicalIF":2.9,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photonic modes in twisted graphene nanoribbons 扭曲石墨烯纳米带中的光子模式

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-11-08 DOI: 10.1016/j.physe.2024.116146

Abdullah Guvendi , Semra Gurtas Dogan , Omar Mustafa , Kobra Hasanirokh

{"title":"Photonic modes in twisted graphene nanoribbons","authors":"Abdullah Guvendi , Semra Gurtas Dogan , Omar Mustafa , Kobra Hasanirokh","doi":"10.1016/j.physe.2024.116146","DOIUrl":"10.1016/j.physe.2024.116146","url":null,"abstract":"<div><div>This study investigates the behavior of photonic modes in twisted graphene nanoribbons (TGNRs) using an analytical approach based on solving the fully covariant vector boson equation. We present a model that demonstrates how helical twisting in TGNRs significantly affects the evolution of photonic modes. Our analytical solutions yield detailed expressions for mode profiles, energy spectra, and decay characteristics. We find that increasing the twist parameter shortens the decay times (<span><math><msub><mrow><mi>τ</mi></mrow><mrow><mi>n</mi><mi>s</mi></mrow></msub></math></span>) for damped modes, indicating enhanced photonic coupling due to the twisted geometry. Conversely, longer nanoribbons (NRs) exhibit increased decay times, showing a length (<span><math><mi>L</mi></math></span>)-dependent effect, where <span><math><mrow><msub><mrow><mi>τ</mi></mrow><mrow><mi>n</mi><mi>s</mi></mrow></msub><mo>∝</mo><mi>L</mi><mo>/</mo><mi>c</mi></mrow></math></span>, with <span><math><mi>c</mi></math></span> representing the speed of light. These findings may enhance the understanding of light control in nanostructures and suggest potential applications in tunable photonic devices, topological photonics, and quantum optical systems.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"166 ","pages":"Article 116146"},"PeriodicalIF":2.9,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Uncovering bound states in the continuum in InSb nanowire networks 揭示 InSb 纳米线网络中的连续束缚态

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-11-07 DOI: 10.1016/j.physe.2024.116145

D. Martínez , P.A. Orellana , L. Rosales , J. Dolado , M. Amado , E. Diez , F. Domínguez-Adame , R.P.A. Lima

{"title":"Uncovering bound states in the continuum in InSb nanowire networks","authors":"D. Martínez , P.A. Orellana , L. Rosales , J. Dolado , M. Amado , E. Diez , F. Domínguez-Adame , R.P.A. Lima","doi":"10.1016/j.physe.2024.116145","DOIUrl":"10.1016/j.physe.2024.116145","url":null,"abstract":"<div><div>Bound states in the continuum (BICs) are exotic, localized states even though their energy lies in the continuum spectra. Since its discovery in 1929, the quest to unveil these exotic states in charge transport experiments remains an active pursuit in condensed matter physics. Here, we study charge transport in InSb nanowire networks in the ballistic regime and subject to a perpendicular magnetic field as ideal candidates to observe and control the appearance of BICs. We find that BICs reveal themselves as distinctive resonances or antiresonances in the conductance by varying the applied magnetic field and the Fermi energy. We systematically consider different lead connections in hashtag-like nanowire networks, finding the optimal configuration that enhances the features associated with the emergence of BICs. Finally, the investigation focuses on the effect of the Rashba spin–orbit interaction of InSb on the occurrence of BICs in nanowire networks. While the interaction generally plays a detrimental role in the signatures of the BICs in the conductance of the nanowire networks, it opens the possibility to operate these nanostructures as spin filters for spintronics. We believe that this work could pave the way for the unambiguous observation of BICs in charge transport experiments and for the development of advanced spintronic devices.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"166 ","pages":"Article 116145"},"PeriodicalIF":2.9,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced piezoelectricity induced by transition metal atoms adsorption on monolayer and bilayer MoS2 单层和双层 MoS2 上吸附过渡金属原子诱导的增强压电性

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-11-06 DOI: 10.1016/j.physe.2024.116148

Xinxin Wang, Gaojie Li, Xiaofei Wang, Weiwei Ju, Xiaohong Li

{"title":"Enhanced piezoelectricity induced by transition metal atoms adsorption on monolayer and bilayer MoS2","authors":"Xinxin Wang, Gaojie Li, Xiaofei Wang, Weiwei Ju, Xiaohong Li","doi":"10.1016/j.physe.2024.116148","DOIUrl":"10.1016/j.physe.2024.116148","url":null,"abstract":"<div><div>Piezoelectricity in MoS<sub>2</sub> has attracted extensive attention because of potential applications in energy harvesting and sensors. However, the piezoelectricity of MoS<sub>2</sub> monolayer is weaker than those of traditional piezoelectric materials. Here, based on first principles calculations, we report the large work function transition metal atoms (TMs = Ni, Pd, Pt and Ir) adsorbed on monolayer and bilayer MoS<sub>2</sub> with large out-of-plane piezoelectric polarization. For TMs adsorbed on monolayer MoS<sub>2</sub>, the Ir and Ni adsorption exhibit stronger adsorption energy and larger migration barrier compared with Pd and Pt adsorption. All structures maintain dynamical stability at 300 K and exhibit p-type semiconducting band structures. The larger out-of-plane piezoelectric coefficients induced by adsorption increase with increasing the adsorption concentration, accompanied with slightly decreased in-plane piezoelectric coefficients, which is attributed to more and more electrons participating in redistribution along the out-of-plane direction. For TMs adsorbed bilayer MoS<sub>2</sub>, the energetically favorable configuration has same polarization orientation between two monolayers, which results in increased in-plane piezoelectric coefficients. The out-of-plane piezoelectric coefficients further increase due to the coupling of interlayer vertical polarization and TMs adsorption induced vertical polarization. Our results provide a possible way to increase the piezoelectricity of MoS<sub>2</sub>.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"166 ","pages":"Article 116148"},"PeriodicalIF":2.9,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Giant excitonic magneto-Stark effect in wide GaAs/AlGaAs quantum wells 宽砷化镓/砷化镓量子阱中的巨激子磁-斯塔克效应

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-10-31 DOI: 10.1016/j.physe.2024.116134

D.K. Loginov, I.V. Ignatiev

引用次数: 0

Fluorinated carbon nanotube-insulator–metal diodes: Predictions from first-principles calculations 氟化碳纳米管-绝缘体-金属二极管：第一原理计算预测

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-10-30 DOI: 10.1016/j.physe.2024.116133

G.R. Berdiyorov

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Single-layer black phosphorus-enhanced narrowband perfect absorber in the terahertz range 太赫兹范围内的单层黑磷增强型窄带完美吸收器

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-10-29 DOI: 10.1016/j.physe.2024.116144

Pengfei Sun , Lijing Su , Sihan Nie , Xin Li , Yaxin Zhou , Yang Gao

引用次数: 0

Type-II induced quantum confinement in type-I heterostructured semiconductor nanowires I 型异质结构半导体纳米线中的 II 型诱导量子约束

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-10-28 DOI: 10.1016/j.physe.2024.116132

Temerson F.O. Lara , Diego R. da Costa , Alice R. de Almeida , Ariel A. de Sousa , André J. Chaves , Andrey Chaves , Teldo A.S. Pereira

{"title":"Type-II induced quantum confinement in type-I heterostructured semiconductor nanowires","authors":"Temerson F.O. Lara , Diego R. da Costa , Alice R. de Almeida , Ariel A. de Sousa , André J. Chaves , Andrey Chaves , Teldo A.S. Pereira","doi":"10.1016/j.physe.2024.116132","DOIUrl":"10.1016/j.physe.2024.116132","url":null,"abstract":"<div><div>We theoretically investigate the electronic properties of semiconductor nanowires with axial heterostructure. We employ the effective mass approximation within envelope wavefunction formalism to analyze the behavior of charge carriers in nanowires composed of two semiconductor materials with different energy gaps, grown along the wire axis, with a cylindrically symmetric shape. We start by considering a type-I band alignment, resulting in the formation of a quantum well structure. Then, we demonstrate that modifications in the effective mass and the structural parameters of the system make it possible to change the type of the band alignment, thus dictating the carrier confinement. For certain values of the wire radius and the ratio of effective masses between the well and barrier regions, the contribution of the kinetic energy term to the total effective confinement potential becomes predominant compared to the mismatched band potential. This leads to a switching in the preferential spatial distribution of the wave functions towards the barrier region, exhibiting characteristics of a type-II induced axial junction.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"166 ","pages":"Article 116132"},"PeriodicalIF":2.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Yu-Shiba-Rusinov bound states boost surface odd-frequency pairing Yu-Shiba-Rusinov 边界态促进表面奇频配对

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-10-26 DOI: 10.1016/j.physe.2024.116127

Subhajit Pal, Colin Benjamin

{"title":"Yu-Shiba-Rusinov bound states boost surface odd-frequency pairing","authors":"Subhajit Pal, Colin Benjamin","doi":"10.1016/j.physe.2024.116127","DOIUrl":"10.1016/j.physe.2024.116127","url":null,"abstract":"<div><div>We predict that the appearance of zero-energy Yu-Shiba-Rusinov(YSR) bound states in two different setups, metal-spin flipper-metal-s-wave superconductor (<span><math><mrow><msub><mrow><mi>N</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>−</mo><mi>s</mi><mi>f</mi><mo>−</mo><msub><mrow><mi>N</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>−</mo><mi>S</mi></mrow></math></span>) and superconductor-metal-spin flipper-metal-superconductor (<span><math><mrow><mi>S</mi><mo>−</mo><msub><mrow><mi>N</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>−</mo><mi>s</mi><mi>f</mi><mo>−</mo><msub><mrow><mi>N</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>−</mo><mi>S</mi></mrow></math></span>) junctions, can cause a multi-fold enhancement of surface odd-frequency superconducting pairing. On the other hand, in the absence of these bound states, even-frequency pairing dominates surface odd-frequency pairing. Specifically, in the <span><math><mrow><mi>S</mi><mo>−</mo><msub><mrow><mi>N</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>−</mo><mi>s</mi><mi>f</mi><mo>−</mo><msub><mrow><mi>N</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>−</mo><mi>S</mi></mrow></math></span> Josephson junction, the emergence of zero energy YSR bound states leads to a <span><math><mrow><mn>0</mn><mo>−</mo><mi>π</mi></mrow></math></span> junction transition and surface odd-frequency pairing dominance. Notably, odd-frequency pairing vanishes in the absence of the YSR-bound states. Interestingly, the equal spin–triplet pairing is the dominant component in odd-frequency superconductivity in both setups, which could have important implications for superconducting spintronics. Overall, our findings may help to detect the presence of YSR-bound states through the observation of surface odd-frequency pairing and contribute to a better understanding of their relationship.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"166 ","pages":"Article 116127"},"PeriodicalIF":2.9,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142534020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0