Review
Quantum Science & Technology
Junji Haruyama
Summary: The study of quantum-spin-Hall (QSH) phase in graphene has attracted considerable attention, especially with the use of heavy adatom decoration and heavy substrates, which provides possibilities for next-generation spintronic architectures.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Tianhui Li, Lin Liu, Zehan Chen, Wei Jia, Jianxin Ye, Xudong Cai, Doudou Huang, Wanshan Li, Fukang Chen, Xinjun Li, Jiahao Chen, Boxi Dong, Hang Xie, Anyuan Pan, Chao Zhi, Hongyu An
Summary: Studying the mechanism of the spin Hall effect in Pt/Tm3Fe5O12 heterostructures, we demonstrate the intrinsic contribution in the moderately dirty regime is responsible for the generation of this spin Hall effect, through tuning the properties of Pt and investigating the efficiency of spin-orbit torque generation.
Article
Chemistry, Multidisciplinary
Bin Cao, Tobias Grass, Olivier Gazzano, Kishan Ashokbhai Patel, Jiuning Hu, Markus Muller, Tobias Huber-Loyola, Luca Anzi, Kenji Watanabe, Takashi Taniguchi, David B. Newell, Michael Gullans, Roman Sordan, Mohammad Hafezi, Glenn S. Solomon
Summary: By accurately measuring the photocurrent signal and modeling the data using optical Bloch equations, we have studied the relaxation of carriers in graphene in the quantum Hall regime. Our results provide a unified understanding of the relaxation processes in graphene over different magnetic field strength regimes and show clear evidence of carrier multiplication. Additionally, our findings reveal the interplay of Coulomb interactions and interactions with acoustic and optical phonons, as well as the chiral transport properties and chirality change at the Dirac point in the quantum Hall regime.
Article
Materials Science, Multidisciplinary
Abhishek Kumar, Saurabh Maiti, Dmitrii L. Maslov
Summary: Collective spin excitations in graphene with proximity-induced spin-orbit coupling of the Rashba and valley-Zeeman types are investigated. It is found that even in the absence of an external magnetic field, the system supports collective spin modes, detectable via zero-field electron spin resonance (ESR) and zero-field electric-dipole spin resonance (EDSR). The effects of electron-electron interaction are analyzed, leading to splitting of both ESR and EDSR peaks which can be used to extract spin-orbit coupling constants and many-body interaction parameters.
Article
Physics, Applied
Sourabh Manna, Rohit Medwal, Surbhi Gupta, John Rex Mohan, Yasuhiro Fukuma, Rajdeep Singh Rawat
Summary: Ferromagnet/nonmagnet (FM/NM) bilayer-based spin Hall nano-oscillators (SHNOs) have potential for low-power physical reservoir computing systems. However, most studies require an external biasing magnetic field, limiting their practical implementation. This study demonstrates biasing field-free operation of a FM/NM bilayer-based SHNO using magnetic anisotropy control, which can significantly modify the auto-oscillation characteristics and reduce the threshold current for auto-oscillation.
APPLIED PHYSICS LETTERS
(2023)
Article
Quantum Science & Technology
Junxu Li, Manas Sajjan, Sumit Suresh Kale, Sabre Kais
Summary: This report proposes an experimental scheme to study the possible influence of quantum entanglement on the angular features of product distribution in a chemical reaction. The study aims to examine the relationship between quantum entanglement and spin-orbit interaction. The attainable results will be numerically simulated to highlight specific patterns corresponding to various possibilities, potentially providing unforeseen mechanistic insight into analogous reactions.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Chemistry, Multidisciplinary
Cyrine Ernandes, Lama Khalil, Hugo Henck, Meng-Qiang Zhao, Julien Chaste, Fabrice Oehler, Alan T. Charlie Johnson, Maria C. Asensio, Debora Pierucci, Marco Pala, Jose Avila, Abdelkarim Ouerghi
Summary: Researchers investigated the band structure of WS2/graphene heterobilayer for various twist angles and found that strain quantitatively affects electronic features of WS2 monolayers, including the spin-orbit coupling strength. They demonstrated that the WS2 spin-orbit splitting can be tuned by strain, showing potential for controlling the band dispersion of van der Waals materials.
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
Optics
Peng Xu, Tian-Shu Deng, Wei Zheng, Hui Zhai
Summary: By combining two-photon Raman transition and periodic modulation of spin-dependent interaction, we propose a method for realizing density-dependent spin-orbit coupling in ultracold Bose and Fermi gases. This method leads to the occurrence of both direct Raman process and interaction-assisted Raman process, which have opposite effects in terms of spin-momentum locking and compete with each other. As the interaction modulation increases, the system undergoes a crossover from the direct Raman process dominated regime to the interaction-assisted Raman process dominated regime.
Article
Chemistry, Multidisciplinary
Felix Luepke, Dacen Waters, Anh D. Pham, Jiaqiang Yan, David G. Mandrus, Panchapakesan Ganesh, Benjamin M. Hunt
Summary: In this study, the topological nature of twisted bilayer WTe2 was investigated using scanning tunneling microscopy and spectroscopy (STM/STS). The characteristic spectroscopic signatures of the quantum spin Hall edge states were observed at the edges of the twisted bilayer. Through calculations, it was found that the topology of WTe2 bilayers can be engineered by adjusting the twist angle and interlayer interactions.
Article
Multidisciplinary Sciences
Yuki Hibino, Tomohiro Taniguchi, Kay Yakushiji, Akio Fukushima, Hitoshi Kubota, Shinji Yuasa
Summary: The study elucidates a mechanism behind the enhancement of magnetic-dependent charge-to-spin conversion in ferromagnetic materials, highlighting the dominant role of interfacial contribution and the potential for control via interfacial band engineering. It shows that the efficiency of charge-to-spin conversion in ferromagnets surpasses other materials with reduced symmetry.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Applied
Ye Zhang, Jianjun Lai, Changhong Chen
Summary: A graphene-based long-wavelength infrared modulator with high contrast is presented. The frequency detuning of magnetic and electric surface plasmons can be controlled by adjusting the graphene Fermi energy, leading to high modulation depth and low insertion loss.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
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
Nanoscience & Nanotechnology
Yougang Ke, Yongfeng Bian, Qiang Tang, Jibo Tian, Linzhou Zeng, Yu Chen, Xinxing Zhou
Summary: In this paper, the authors introduce a novel three-dimensional rotational photonic spin Hall effect (PSHE) and demonstrate how to control the rotation angle of the splitting patterns by adjusting the rotation angle of metasurfaces. They also show that the number of lobes in the splitting patterns can be independently controlled by introducing a dynamic phase. These findings enable active manipulation of spin photons in multiple dimensions and may have potential applications in optical microscopy, among other areas.
Article
Chemistry, Multidisciplinary
Yajuan Hui, Hui Jiang, Fei Xie, Weinan Lin, Chao Dong, Kaifeng Dong, Qiang He, Xiangshui Miao
Summary: The interconversion between charge and spin at the HM/FM interface through spin-orbit coupling is crucial for determining the amplitude of SMR, which has potential applications in novel electronics. In this study, annealed NiFe films on MgO (100) substrates capped with Pt and Ta exhibit maximum SMR. The negative SMR observed in Ta(d(Ta))/Pt(3 nm)/annealed NiFe samples is attributed to the interfacial spin-orbit coupling and the generation of spin current. The spin accumulation is enhanced at Pt(3 nm)/annealed NiFe interfaces after capping with a Ta layer.
Article
Chemistry, Multidisciplinary
Isaac Alcon, Gaetano Calogero, Nick Papior, Aleandro Antidormi, Kenan Song, Aron W. Cummings, Mads Brandbyge, Stephan Roche
Summary: Recent progress in on-surface synthesis and characterization of nanomaterials is enabling the creation of new carbon allotropes, such as the biphenylene network (BPN), which exhibits unusual metallic conductivity and potential device functionalities in nanoelectronics and spintronics.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Mustafa Neset Cinar, Aleandro Antidormi, Viet-Hung Nguyen, Alessandro Kovtun, Samuel Lara-Avila, Andrea Liscio, Jean-Christophe Charlier, Stephan Roche, Haldun Sevincli
Summary: A study reveals the charge conduction laws in multilayer reduced graphene oxides (rGO), showing that interlayer interaction and film thickness have effects on diffusion. In contacted films, conduction is predominantly driven by interlayer hopping when the mean free path becomes shorter than the channel length. These findings contribute to the optimization of graphene-based composites with improved electrical conduction.
Article
Nanoscience & Nanotechnology
Giuseppe Bevilacqua, Alessandro Cresti, Giuseppe Grosso, Guido Menichetti, Giuseppe Pastori Parravicini
Summary: Based on the Landauer-Buttiker theory, this study explores the thermal regimes of nanoscale systems with an energy-peaked transmission function. It identifies the operation regions where the system acts as an energy pump or heat pump, or operates in dissipative modes. The study demonstrates the presence of quantum bounds for thermoelectric quantities and their dependence on the position of the transmission peak.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Review
Materials Science, Multidisciplinary
David Soriano
Summary: The rise of twistronics has revolutionized the field of condensed matter physics and has significant implications for the future applications of 2D materials. This article provides a brief overview of recent theoretical and experimental works exploring the impact of twist angles on 2D magnets, specifically examining the formation of antiferromagnetic domains in chromium trihalides and the spin-wave dispersion of bilayer CrI3.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Youkyung Seo, Soo Yeon Kim, Yeeun Kim, Chulmin Kim, Byung Chul Lee, Yoon Hee Park, Minji Chae, Youjin Hong, Min Kyung Seong, Changhyun Ko, Alessandro Cresti, Christoforos Theodorou, Gyu Tae Kim, Min-Kyu Joo
Summary: The presence of surface adsorbates and oxidation in 2D multilayers can significantly affect the carrier density distribution and mobility. We discovered a hidden surface channel in black phosphorus and rhenium disulfide multilayers, caused by ambient adsorbates and surface oxides, which not only alters the carrier density but also suppresses the carrier mobility.
Article
Physics, Applied
Andres Jenaro Lopez Garcia, Mireille Mouis, Alessandro Cresti, Ran Tao, Gustavo Ardila
Summary: This study investigates the influence of the density and dynamics of surface traps on the output potential and effective piezoelectric coefficient of ZnO nanowire array based nanocomposites. It is found that a certain number of surface traps are necessary to achieve usable output potential, and their influence is strongly dependent on their dynamics.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Hyunsoo Yang, Sergio O. Valenzuela, Mairbek Chshiev, Sebastien Couet, Bernard Dieny, Bruno Dlubak, Albert Fert, Kevin Garello, Matthieu Jamet, Dae-Eun Jeong, Kangho Lee, Taeyoung Lee, Marie-Blandine Martin, Gouri Sankar Kar, Pierre Seneor, Hyeon-Jin Shin, Stephan Roche
Summary: This article provides an overview of the current developments and challenges in regards to MRAM and outlines the opportunities that can arise by incorporating two-dimensional material technologies. The fundamental properties of atomically smooth interfaces, reduced material intermixing, crystal symmetries, and proximity effects are highlighted as key drivers for possible disruptive improvements in MRAM at advanced technology nodes.
Article
Physics, Multidisciplinary
Dinh Van Tuan, Su-Fei Shi, Xiaodong Xu, Scott A. Crooker, Hanan Dery
Summary: In the monolayer semiconductor WSe2, magneto-optical measurements have revealed optical transitions of six-body exciton states (hexcitons) and eight-body exciton states (oxcitons) at high electron doping levels, where photoexcited electron-hole pairs interact with multiple Fermi seas. These many-body states involve distinguishable spin and valley quantum numbers and are related to dark trions and satellite optical transitions of hexcitons in the photoluminescence spectrum.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
Andres Jenaro Lopez Garcia, Mireille Mouis, Thomas Jalabert, Alessandro Cresti, Gustavo Ardila
Summary: This study investigated the relationship between the electromechanical response of semiconducting piezoelectric nanowires (NWs) and their length. A new mechanism of piezoresponse saturation was identified, which resulted from the combined influence of interface traps and piezoelectric polarization in the depleted NW. The results of this study were in better qualitative agreement with experimental observations compared to existing theories. The finite element method was used to simulate the mechanical, piezoelectric, and semiconductor properties of the NWs, with simulations focusing on uniform ZnO NWs grown along the c-axis. An analytical model was developed to support the analysis and provided trends of saturation length and piezoresponse as a function of NW dimensions, doping level, surface traps density, crystal polarity, and external pressure.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Multidisciplinary
Marta Galbiati, Fernando Ramiro-Manzano, Jose Joaquin Perez Grau, Fernando Cantos-Prieto, Jaume Meseguer-Sanchez, Ivona Kosic, Filippo Mione, Ana Pallares Vilar, Andres Cantarero, David Soriano, Efren Navarro-Moratalla
Summary: By using hyperspectral wide-field imaging, researchers revealed a nonmonotonic thickness dependence of the optical properties in magnetic 2D material CrI3. This finding sheds light on the structural conundrum and offers insights into mesoscopic effects in layered materials and light-matter interactions in magnetic 2D materials.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Xuefei Li, Xinhang Shi, Damiano Marian, David Soriano, Teresa Cusati, Giuseppe Iannaccone, Gianluca Fiori, Qi Guo, Wenjie Zhao, Yanqing Wu
Summary: Van der Waals coupling with different stacking configurations is a powerful method to tune the optical and electronic properties of two-dimensional materials. This study focuses on investigating 3R-stacked transition-metal dichalcogenides as a possible option for high-performance field-effect transistors. The results show that 3R bilayer WS2 (WSe2) exhibits higher effective mobility and improved conductivity compared to the 2H stacking. These improvements originate from the strong interlayer coupling in the 3R stacking. This method provides a scalable route for advanced channel materials in electronic devices.
Article
Materials Science, Multidisciplinary
Lei Ren, Cedric Robert, Hanan Dery, Minhao He, Pengke Li, Dinh Van Tuan, Pierre Renucci, Delphine Lagarde, Takashi Taniguchi, Kenji Watanabe, Xiaodong Xu, Xavier Marie
Summary: We investigated charge tunable devices based on WSe2 and WS2 monolayers encapsulated in hexagonal boron nitride. We observed a weaker-intensity optical transition in photoluminescence measurements when the monolayers were electrostatically doped with electrons. Through a detailed characterization of this photoluminescence line, we identified it as an impurity-assisted radiative recombination of the intervalley negatively charged exciton (triplet trion). Our measurements also revealed the spin-orbit splitting energy difference between the emitted photons from the two possible recombination processes of the same triplet trion.
Article
Materials Science, Multidisciplinary
Pengke Li, Cedric Robert, Dinh Van Tuan, Lei Ren, Min Yang, Xavier Marie, Hanan Dery
Summary: The variety of excitonic states in tungsten-based dichalcogenide monolayers originates from the unique interplay between spin and valley degrees of freedom. Among the exciton species, the indirect exciton (momentum or valley dark) is responsible for a series of resonances when the monolayer is charge neutral. In this study, we investigate the short-range electron-hole exchange interaction and the recombination mechanism mediated by impurities of the indirect exciton. The analysis provides a thorough understanding of the energy and polarization of the zero-phonon indirect exciton resonance in the emission spectrum.
Article
Nanoscience & Nanotechnology
Aleandro Antidormi, Luigi Colombo, Stephan Roche
Summary: This paper reviews recent developments in the synthesis and properties of amorphous two-dimensional materials, mainly focusing on amorphous graphene and boron nitride. The structural, vibrational and electronic properties of these materials are discussed, along with their potential for electronic applications.
NANO MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Shahid Sattar, J. Andreas Larsson, C. M. Canali, Stephan Roche, Jose H. Garcia
Summary: We demonstrate the presence of significant magnetism and valley polarization in Janus Pt dichalcogenides when bound to a EuO substrate. This proximity-induced effect leads to the formation of two valleys in the conduction bands, each with its own spin polarization and specific spin texture.
