Article
Chemistry, Multidisciplinary
Chia-Tse Tai, Po-Yuan Chiu, Chia-You Liu, Hsiang-Shun Kao, C. Thomas Harris, Tzu-Ming Lu, Chi-Ti Hsieh, Shu-Wei Chang, Jiun-Yun Li
Summary: The demonstration of 2D hole gases in GeSn/Ge heterostructures shows a high mobility of up to 20,000 cm(2) V-1 s(-1). The study observed Shubnikov-de Haas oscillations and integer quantum Hall effect, and investigated the Rashba spin-orbit coupling through magneto-transport. Additionally, a transition from weak localization to weak anti-localization was observed, demonstrating the tunability of SOC strength by gating.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Y. Avishai, Y. B. Band
Summary: This study focuses on the spin physics of electrons in single layer graphene under one-dimensional periodic potential and uniform Rashba spin-orbit coupling. Peculiar features relevant to graphene spintronics are discovered, such as the non-zero polarization of spin along the z direction perpendicular to the graphene plane.
Article
Chemistry, Multidisciplinary
Yulin Gan, Fazhi Yang, Lingyuan Kong, Xuejiao Chen, Hao Xu, Jin Zhao, Gang Li, Yuchen Zhao, Lei Yan, Zhicheng Zhong, Yunzhong Chen, Hong Ding
Summary: A significant enhancement of Rashba spin-orbit coupling (RSOC) achieved at a superconducting amorphous-Hf0.5Zr0.5O2/KTaO3(110) heterointerface under light illumination is reported. The RSOC strength can be as high as 1.9 T in the normal state and increases to a peak value of 12.6 T under light illumination near the Lifshitz transition point, showing great potential for spintronics.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
S. Mohammadi, A. Phirouznia, M. Esmailpour
Summary: The quantum transport properties of few-layer silicene nanoribbons (FSNR) exposed to a vertical electric field and Rashba spin-orbit coupling were studied, revealing the effects of external electric fields on the electron band structure transition and topological phase transitions in FSNR. Controlling spin current through tuning the strength of Rashba spin-orbit coupling demonstrates potential applications in silicene-based devices and spintronic development.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Physics, Applied
Zhi Ping Niu, Yong Mei Zhang
Summary: We theoretically investigate the conductance spectra induced by Andreev reflection (AR) in antiferromagnet/normal layer/superconductor junctions with hexagonal lattices. The antiferromagnet may exhibit spin polarization when the PT symmetry is broken by the staggered sublattice potential. The conductance peak divides into two peaks near the singlet-gap energy, indicating the existence of spin-triplet pairings in the antiferromagnet when the equal-spin AR process dominates. Further modulation of the conductance peak splitting can be achieved by controlling the amplitudes of conventional and equal-spin ARs, providing a method to distinguish between spin-singlet and spin-triplet pairings. These findings highlight the potential of antiferromagnet/superconductor junctions in future superconducting spintronics applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Chao Yang, Da-Kun Zhou, Ya-Ru Wang, Zheng-Chuan Wang
Summary: This paper investigates the spin-orbit torque and transport property in a 2D Rashba ferromagnetic electron gas. The longitudinal conductivity has two parts: one is determined by the charge density and independent of spin degrees of freedom, while the other is directly proportional to spin-orbit torque regardless of the band structure and temperature. This study reveals a general relationship between the transport property and spin-orbit torque. Additionally, the impacts of the spin-orbit coupling constant and Fermi energy on transverse conductivity and spin-orbit torque are discussed, providing helpful information for relevant experiments.
Article
Multidisciplinary Sciences
Shunsuke Yoshizawa, Takahiro Kobayashi, Yoshitaka Nakata, Koichiro Yaji, Kenta Yokota, Fumio Komori, Shik Shin, Kazuyuki Sakamoto, Takashi Uchihashi
Summary: The research provides evidence that spin-momentum locking plays a crucial role in the superconductivity of crystalline atomic-layer superconductors on surfaces, with Rashba spin orbit coupling enhancing the critical magnetic field and protecting superconductivity.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Analytical
Aek Jantayod
Summary: In this study, the theoretical characteristics of a ferromagnetic/insulator/ferromagnetic Rashba metal junction with both Rashba spin-orbit coupling and exchange energy splitting were investigated. Three metallic states were found in the ferromagnetic Rashba metal, and the conductance of the junction was strongly influenced by the thickness and barrier height of the insulator layer in the Rashba ring metal and anomalous Rashba metal states. Additionally, the spin polarization in the anomalous Rashba metal state was high and unaffected by the qualities of the insulator.
Article
Physics, Multidisciplinary
Yi-Jian Shi, Yuan-Chun Wang, Peng-Jun Wang
Summary: The paper investigates quantized conductance and valley polarization in silicene nanoconstrictions, finding an almost perfect valley filter effect and proposing new strategies for controlling valley polarization. The valley polarization plateaus shift with increased spin-orbit coupling strength, accompanied by smooth variation in polarization reversal.
Article
Physics, Multidisciplinary
Wei-Min Jiang, Qiang Zhao, Jing-Zhuo Ling, Ting-Na Shao, Zi-Tao Zhang, Ming-Rui Liu, Chun-Li Yao, Yu-Jie Qiao, Mei-Hui Chen, Xing-Yu Chen, Rui-Fen Dou, Chang-Min Xiong, Jia-Cai Nie
Summary: The carrier density and mobility at the CaZrO3/SrTiO3 interface can be tuned by gate voltage, along with the magnitude of Rashba spin-orbit interaction. Furthermore, the diffusion constant and the spin-orbit relaxation time can be strongly adjusted by gate voltage.
Article
Physics, Condensed Matter
Fanhua Meng, Jianhua Zhao, Jie Cheng, Wen Liu
Summary: This study investigates the spin-orbit coupling (SOC) in n-quantum-well structures with occupied n subbands using an external gate potential. It is found that the SOC coefficient of the lowest subband is always much larger than those of the other subbands in triple to septuple quantum-well structures, leading to greater spin splitting and desirable spin polarization. The SOC can be selectively controlled by adjusting the gate, although it becomes less gate-dependent when more local wells are incorporated in the case of n-subband occupation. These findings are attributed to charge transfer among the subwells and the variation gradient of the potential energy along the growth direction of the quantum wells.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
K. Lakaal, M. Kria, J. El Hamdaoui, Varsha, V. Prasad, Vijit V. Nautiyal, M. El-Yadri, L. M. Perez, D. Laroze, E. Feddi
Summary: The magnetic and thermodynamic properties of a confined two-electron system in a 2D quantum structure under an applied magnetic field are studied, taking into account spin-orbit and electron-phonon interactions. The results show that both the spin-orbit interaction and the polaron effect have significant effects on the magnetic nature and heat capacity curve of the system.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Vinayak M. Kulkarni, Amit Gupta, N. S. Vidhyadhiraja
Summary: This study investigates the noninteracting and non-Hermitian, parity-time (PT) symmetric Anderson model, and finds that in the noninteracting case, the exceptional point can be renormalized by the non-Hermitian coupling and Rashba spin-orbit coupling. The relationship between the critical point and the exceptional point varies for different parameter values.
Article
Physics, Condensed Matter
Farhad Sattari, Soghra Mirershadi
Summary: This study presents a theoretical investigation of the spin and valley dependent transport properties in a WSe2 superlattice with external Rashba spin-orbit interaction (ERSOI). The results demonstrate that the conductance, with and without spin flip, strongly relies on the ERSOI and exhibits oscillatory behavior with respect to the ERSOI strength. Furthermore, the magnitude of spin-dependent conductance can be controlled by the potential barrier height and number of superlattice barriers. The results also reveal an oscillatory evolution of the valley and spin polarization with respect to ERSOI strength and potential barrier height, indicating the potential use of a WSe2 superlattice for the design of novel valleytronic and spintronic devices.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Rui Zhang, Yuan-Chuan Biao, Wen-Long You, Xiao-Guang Wang, Yu-Yu Zhang, Zi-Xiang Hu
Summary: In this study, a generalized Rashba coupling approximation is introduced to solve confined two-dimensional electron systems with both Rashba and Dresselhaus spin-orbit couplings in an external magnetic field. A solvable Hamiltonian is obtained, and analytical energies and spin polarization are analyzed. It is found that Dresselhaus coupling and Zeeman splittings tend to suppress the resonant spin Hall effect.
CHINESE PHYSICS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Akbar Doostaregan, Adib Abrishamifar
CIRCUITS SYSTEMS AND SIGNAL PROCESSING
(2020)
Article
Physics, Applied
Fatemeh Bourbour, Mahdi Esmaeilzadeh, Seyed Mohammad Elahi, Leila Eslami
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Engineering, Electrical & Electronic
Akbar Doostaregan, Adib Abrishamifar
MICROELECTRONICS JOURNAL
(2020)
Article
Engineering, Electrical & Electronic
Anahita Bagheri, Abbas Erfanian, Adib Abrishamifar
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2020)
Article
Engineering, Electrical & Electronic
Mohammadreza Noroozi, Adib Abrishamifar, Gholamali Rezaierad
Summary: This paper proposes a novel Pulse Width Modulation (PWM) switching technique based on Optimized Carrier Peaks-PWM (OCP-PWM) for controlling both single-phase and three-phase multilevel inverters. The proposed PWM scheme defines the optimum values for carrier peaks through multi-peak selection and minimizes the output voltage Total Harmonic Distortion (THDv), switching frequency (f(s)), and switching losses compared to other carrier-based PWM methods. Experimental results confirm the effectiveness of the presented PWM scheme.
IETE JOURNAL OF RESEARCH
(2022)
Article
Chemistry, Physical
Somaieh Ahmadi, Mostafa Raeisi, Leila Eslami, Ali Rajabpour
Summary: Two-dimensional materials, such as BC6N and BSb, show promising thermoelectric characteristics with high Seebeck coefficients and power factors. BC6N-rec exhibits the highest power factor and operating temperature, while BC6N has the highest Seebeck coefficient but low electrical conductivity. Further investigations on two-dimensional structures are needed for their potential use in thermoelectric applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Energy & Fuels
Saeid Amjadian, Mahdi Esmaeilzadeh, Rasul Ajeian, Gholamhossein Riazi, Seeram Ramakrishna
Summary: Biohybrid solar cells, inspired by photosynthesis in plants, are new environmentally friendly and low-cost solar cells. Spinach is found to be the best plant for these cells due to its high light absorbance. Temperature and pH conditions also affect the light absorbance, with high temperatures and acidic pH causing a decrease in absorbance.
Article
Automation & Control Systems
Pourang Ardalan, Navid Rasekh, Mohammad Zamani Khaneghah, Adib Abrishamifar, Masood Saeidi
Summary: A modified PLL algorithm based on a new FLL structure is proposed in this study for high-speed estimation of the phase, frequency, and amplitude of the grid voltage. The proposed PLL structure effectively mitigates input DC offset and enhances response speed. This method contributes to the stability of power systems.
INTERNATIONAL JOURNAL OF DYNAMICS AND CONTROL
(2022)
Article
Chemistry, Physical
Somaieh Ahmadi, Abdus Salam Sepahi Molla, Zeinab Moradi, Leila Eslami
Summary: Density functional theory and semi-classical Boltzmann transport theory were used to investigate the properties of Janus NiSX (X = O, Se, Te), including electronic structure, phononic and optical properties, dynamic stability, and thermoelectric characteristics. The results showed that NiSTe has metallic behavior, while NiSO and NiSSe are semiconducting with indirect bandgap. Janus Ni compounds were found to be stable based on phononic properties and dynamic stability analyses. NiSO and NiSSe have potential as wave reflectors in the infrared range and good optical absorbers in the far ultraviolet range. NiSO and NiSSe also exhibited high Seebeck coefficients and power factors, making them promising thermoelectric materials with a figure of merit of one (ZT similar to 1). These findings suggest that NiSO and NiSSe can be used as efficient alternatives in thermoelectric devices.
APPLIED SURFACE SCIENCE
(2023)
Article
Physics, Applied
Leila Eslami, Nastaran Farshchi, Santanu K. Maiti, Somaieh Ahmadi
Summary: Using Green's function method, the study examines spin-resolved thermoelectric quantum transport in a molecular junction with phenalene molecule and external graphene leads. The results show that applying magnetic exchange potential increases the Seebeck coefficients and generates a current even without bias voltage. The system acts as a spin filter at specific chemical potential and the current dramatically increases in parallel configuration.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Mohammad Acef Ebrahimi, Somaieh Ahmadi, Abdus Salam Sepahi Molla, Santanu K. Maiti
Summary: Non-equilibrium Green's function formalism (NEGF) was used to investigate the electronic properties of (n,0) zigzag tungsten disulfide WS2 nanotubes and the transport properties of (7,0) zigzag nanotube heterojunction. The results showed that the spin-orbit (SO) coupling significantly reduced the band gap by about 15.52%. Moreover, strong negative differential resistances were observed in voltage regions between -0.2 and -0.4 V as well as between -0.5 and -0.6 V. Temperature dependent transport properties were also elaborately studied, revealing a stronger negative differential resistance at both positive and negative bias voltages as the temperature increased to 600 K. Lastly, a reasonably large degree of rectification ratio was established. The findings of this study provide a comprehensive perspective on the NDR effect and current rectification in WS2 nanotubes and serve as a beneficial guide for future design of novel logical, nanoelectronic, and spintronic devices.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Physics, Multidisciplinary
Amin Taghavi, Mahdi Esmaeilzadeh
Summary: This paper investigates the chaotic dynamics of electrons moving with relativistic velocity in a realizable quadrupole wiggler. The nonlinearity of the wiggler magnetic field is found to be the main cause of the chaotic electron motion at large radial distances. Using an electron beam with Gaussian density and an ion channel can control and suppress the chaotic motion of electrons.
CANADIAN JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Physical
Saeed Bagheri, Mohsen Farokhnezhad, Mahdi Esmaeilzadeh
Summary: This study investigates the optical and photothermal properties of gold nanoshells coated with different transition metal dichalcogenides (TMDs) for the treatment of skin cancer. The results show that the intensity and position of the localized surface plasmon resonance (LSPR) peaks of the nanoparticles can be easily adjusted by changing the core radius, gold shell thickness, and number of TMD layers.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Hossein Nikoofard, Mahdi Esmaeilzadeh, Rouhollah Farghadan, Jia Tao Sun
Summary: The study investigates the quantum charge pumping through the surface states of Bi2Te3, showcasing its potential applications in nanoelectronic devices, including memory read-out and field-effect transistors.
Article
Materials Science, Multidisciplinary
Fahimeh Norouzi, Mohsen Farokhnezhad, Mahdi Esmaeilzadeh, Bartlomiej Szafran
Summary: The study shows that spin filtering occurs in borophene nanoribbons exposed to a nonlocal exchange magnetic field, with the spin direction of transmitted electrons being controlled by adjusting the energy of incoming electrons with an external backgate voltage. Additionally, armchair borophene nanoribbons exhibit half-metallic properties in the presence of both a transverse electric field and a nonlocal exchange field.