Article
Optics
Simone Laterza, Antonio Caretta, Richa Bhardwaj, Roberto F. Lammini, Paolo Moras, Matteo Jugovac, Piu Rajak, Mahabul Islam, Regina Ciancio, Valentina Bonanni, Barbara Casarin, Alberto Simoncig, Marco Zangrando, Primoz Rebernik Ribic, Giuseppe Penco, Giovanni De Ninno, Luca Giannessi, Alexander Demidovich, Miltcho Danailov, Fulvio Parmigiani, Marco Malvestuto
Summary: In this study, the propagation characteristics of spin currents across metal-semiconductor interfaces were revealed using ultrafast time-resolved Kerr spectroscopy, providing experimental evidence for their existence and behavior.
Article
Engineering, Electrical & Electronic
Yuyan Wang, Takuya Taniguchi, Po-Hung Lin, Daniel Zicchino, Andreas Nickl, Jan Sahliger, Chih-Huang Lai, Cheng Song, Huaqiang Wu, Qionghai Dai, Christian H. Back
Summary: This study investigates the time-resolved detection of spin-orbit torque switching of the magnetization and exchange bias in platinum/cobalt/iridium-manganese heterostructures. The results show that sub-nanosecond current pulses can partially switch the ferromagnets, interfacial antiferromagnetic spins, and exchange bias, allowing for flexible control of the switching probabilities at multiple levels. The findings also demonstrate that spin-orbit-torque-induced switching of the exchange bias can stabilize multilevelled magnetization switching within sub-nanosecond current pulses.
NATURE ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
D. M. Burn, S. L. Zhang, G. van der Laan, T. Hesjedal
Summary: Magnetic diffraction combined with x-ray detected ferromagnetic resonance (DFMR) is used to study the FMR modes in chiral magnet Cu2OSeO3. The DFMR technique allows for time-resolved measurements of the spin configurations and dynamics of different FMR modes. Continuous phase advance in the conical mode and phase lag in the field-polarized mode are observed, and the dynamics along the conical axis show inversion upon reversing the applied field direction.
Article
Materials Science, Multidisciplinary
Mahdi Afshar, Igor I. Mazin
Summary: The study demonstrates that the magnetic compound Fe3Ga4 satisfies the thermal-fluctuation-driven topological Hall effect mechanism, which may also be applicable to other similar spiral magnets. This finding suggests that this mechanism may have been observed in other compounds before but overlooked.
Article
Chemistry, Physical
Xianzhe Chen, Shuyuan Shi, Guoyi Shi, Xiaolong Fan, Cheng Song, Xiaofeng Zhou, Hua Bai, Liyang Liao, Yongjian Zhou, Hanwen Zhang, Ang Li, Yanhui Chen, Xiaodong Han, Shan Jiang, Zengwei Zhu, Huaqiang Wu, Xiangrong Wang, Desheng Xue, Hyunsoo Yang, Feng Pan
Summary: The study reports the observation of a magnetic spin Hall effect in a collinear antiferromagnet, Mn2Au, where spin currents are generated on two spin sublattices by breaking spatial symmetry, providing a new pathway for controlling spin currents.
Review
Physics, Applied
Lijun Zhu, Daniel C. Ralph, Robert A. Buhrman
Summary: Platinum, with its giant spin Hall conductivity and compatibility with CMOS circuits, has the potential to be an outstanding provider of spin-orbit torques; however, pure clean-limit Pt with low resistivity still provides a low damping-like spin-orbit torque efficiency, limiting its practical applications; the efficiency of spin-orbit torque in Pt-based magnetic heterostructures can be significantly improved by increasing the spin Hall ratio of Pt and the spin transmissivity of the interfaces.
APPLIED PHYSICS REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Lin Huang, Yongjian Zhou, Hongsong Qiu, Hua Bai, Chong Chen, Weichao Yu, Liyang Liao, Tingwen Guo, Feng Pan, Biaobing Jin, Cheng Song
Summary: The inverse spin Hall effect (ISHE) has been investigated in Mn2Au/[Co/Pd] heterostructures, showing that the direction of the Neel vector has a significant impact on the ISHE signal. This finding not only expands the study of the Hall effect, but also enhances the flexibility of antiferromagnetic spintronics.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
K. Sriram, Jay Pala, Bibekananda Paikaray, Arabinda Haldar, Chandrasekhar Murapaka
Summary: This study investigates the influence of a permalloy (Py) seed layer on the tantalum (Ta) polycrystalline phase and its spin Hall angle. It was found that the phase transition from alpha-Ta to (alpha + beta)-Ta depends on the thickness of the Py seed layer. The spin Hall angle of (alpha + beta)-Ta is estimated to be relatively higher than that of alpha-Ta, which could potentially enhance the efficiency of spin to charge conversion in emerging spintronic devices.
Article
Physics, Applied
Young-Gwan Choi, Gyung-Min Choi
Summary: The article presents a time-resolved measurement technique for studying the pulsed SOT's effect on magnetization, which is crucial for investigating the underlying mechanisms of SOT.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Huifeng Chen, Guanyu Liu, Shuang Zhang, Yongchun Zhong, Jianhui Yu, Zhe Chen, Wenguo Zhu
Summary: The photonic spin Hall effect (SHE) is the transverse separation of spin photons in refraction and reflection phenomena. This study investigates the spin-orbit coupling (SOC) in nonlinear uniaxial crystals and demonstrates the SHE of second-harmonic photons. The generation and evolution processes of nonlinear spin photons within the crystal are visualized, and a high-speed modulation scheme for the SHE is proposed.
LASER & PHOTONICS REVIEWS
(2023)
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
Multidisciplinary Sciences
Takuya Kawada, Masashi Kawaguchi, Takumi Funato, Hiroshi Kohno, Masamitsu Hayashi
Summary: The observation of the acoustic spin Hall effect shows that spin current can be induced by lattice motion through spin-orbit interaction. The results demonstrate the strong coupling of electron spins with rotating lattices via the SOI, highlighting the potential of lattice dynamics to supply spin current in strong spin-orbit metals. The spin current in nonmagnetic metals scales with the SOI and the time derivative of the lattice displacement, leading to a field-dependent acoustic voltage in NM/ferromagnetic metal bilayers.
Article
Multidisciplinary Sciences
Liang Peng, Hang Ren, Ya-Chao Liu, Tian-Wei Lan, Kui-Wen Xu, De-Xin Ye, Hong-Bo Sun, Su Xu, Hong-Sheng Chen, Shuang Zhang
Summary: Researchers have discovered a transversely spinning light-induced spin Hall effect on the interface of a metamaterial, leading to beam shift. This unconventional effect, with geometrodynamical nature, can be controlled through the orientation of the photons' spin and provides a previously unexplored mechanism for manipulating light-matter interactions at interfaces.
Article
Physics, Multidisciplinary
Zhejunyu Jin, Xianglong Yao, Zhenyu Wang, H. Y. Yuan, Zhaozhuo Zeng, Weiwei Wang, Yunshan Cao, Peng Yan
Summary: It has been discovered that hidden nonlinear magnon transport in magnetic textures can generate fictitious magnetic fields. By analyzing the scattering features between magnons and skyrmions, a significant Hall angle in both confluence and splitting modes has been predicted, and it has been found that the Hall angle reverses its sign when switching the handedness of the incident magnons. This finding may open up new possibilities for probing gauge fields through nonlinear means.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Edward Schwartz, Hamed Vakili, Moaz Ali, Alexey A. Kovalev
Summary: This study investigates the interplay between vorticity and spin currents in an easy-plane magnet, showing the generation of transverse spin currents accompanying the flow of vorticity, known as the spin Hall effect of vorticity. The research also examines the effect across the BKT transition and highlights the role of dissipation and spin nonconservation in the transition from spin superfluidity to diffusive spin transport. The results of this study pave the way for low power computing devices based on vorticity and spin flows that can propagate over long distances.
Article
Multidisciplinary Sciences
Jingshan S. Du, Donghoon Shin, Teodor K. Stanev, Chiara Musumeci, Zhuang Xie, Ziyin Huang, Minliang Lai, Lin Sun, Wenjie Zhou, Nathaniel P. Stern, Vinayak P. Dravid, Chad A. Mirkin
Article
Chemistry, Physical
Samuel H. Amsterdam, Trevor LaMountain, Teodor K. Stanev, Vinod K. Sangwan, Rafael Lopez-Arteaga, Suyog Padgaonkar, Kenji Watanabe, Takashi Taniguchi, Emily A. Weiss, Tobin J. Marks, Mark C. Hersam, Nathaniel P. Stern
Summary: This study reports the morphology and temperature-dependent optical properties of pentacene films grown on hBN, showing differences in growth modality compared to SiO2 substrates, and demonstrates that using vdW materials provides a pathway for controlling optoelectronic functionality in molecular thin films.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Education, Scientific Disciplines
Ross Hyman, Nathaniel P. Stern, Allen Taflove
Summary: The alternative method presented uses d'Alembert's splitting of waves into forward and backward pulses and can handle varying grid spacing and material properties. The method derives reflections, transmissions, and attenuations at material boundaries, all without using exponential functions, trigonometric functions, or complex numbers. Additionally, it is shown that the FDTD method is exact for dielectrics and remains second-order accurate even when grid spacing varies with position and material parameters make sudden jumps.
AMERICAN JOURNAL OF PHYSICS
(2021)
Article
Optics
Pufan Liu, David A. Czaplewski, Simon Ellis, Robert Kehoe, Kyler Kuehn, Harold M. Spinka, Nathaniel P. Stern, David G. Underwood, Steve Kuhlmann
Summary: This study discusses the use of ring-resonator filters to suppress OH emission, focusing on optimizing filter performance and proposing reliable plans for supernova and positronium observations.
Review
Multidisciplinary Sciences
Nathalie P. de Leon, Kohei M. Itoh, Dohun Kim, Karan K. Mehta, Tracy E. Northup, Hanhee Paik, B. S. Palmer, N. Samarth, Sorawis Sangtawesin, D. W. Steuerman
Summary: Advances in quantum computing hardware technologies over the past two decades have been aimed at solving problems that classical computers cannot handle. Key materials challenges have been identified as limiting progress in quantum computing hardware platforms, requiring interdisciplinary collaboration beyond current boundaries.
Article
Chemistry, Multidisciplinary
J. Tyler Gish, Dmitry Lebedev, Teodor K. Stanev, Shizhou Jiang, Leonidas Georgopoulos, Thomas W. Song, Gilhwan Lim, Ethan S. Garvey, Lukas Valdman, Oluwaseyi Balogun, Zdenek Sofer, Vinod K. Sangwan, Nathaniel P. Stern, Mark C. Hersam
Summary: Two-dimensional transitional metal halides have garnered significant attention recently for their thickness-dependent and electrostatically tunable magnetic properties. By assembling a noncovalent organic buffer layer on the surface of CrI3, researchers have successfully preserved the long-term ambient stability of the material and retained its magnetic properties.
Article
Chemistry, Multidisciplinary
Akshay A. Murthy, Stephanie M. Ribet, Teodor K. Stanev, Pufan Liu, Kenji Watanabe, Takashi Taniguchi, Nathaniel P. Stern, Roberto dos Reis, Vinayak P. Dravid
Summary: Researchers have developed a method to probe local electrostatic fields in 2D heterostructures with nanoscale spatial resolution during electrical operation using the differential phase contrast imaging technique. By combining a traditional DPC setup with a high-pass filter, electric fluctuations from short-range atomic potentials can be largely eliminated. This technique allows for direct comparison of expected electric field values with experimentally derived ones to identify inhomogeneities and problematic regions.
Article
Multidisciplinary Sciences
Trevor LaMountain, Jovan Nelson, Erik J. Lenferink, Samuel H. Amsterdam, Akshay A. Murthy, Hongfei Zeng, Tobin J. Marks, Vinayak P. Dravid, Mark C. Hersam, Nathaniel P. Stern
Summary: The paper describes the selective control of polariton energies in WS2 using the optical Stark effect, extending coherent valley manipulation to a hybrid light-matter regime. The study shows polariton spectra with strong polarization contrast and demonstrates the breaking of valley degeneracy at picosecond timescales, providing a method for coherent control of valley phenomena in exciton-polaritons. The use of microcavity exciton-polaritons in atomically thin semiconductors as a promising platform for valley manipulation is highlighted.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Samuel H. Amsterdam, Teodor K. Stanev, Luqing Wang, Qunfei Zhou, Shawn Irgen-Gioro, Suyog Padgaonkar, Akshay A. Murthy, Vinod K. Sangwan, Vinayak P. Dravid, Emily A. Weiss, Pierre Darancet, Maria K. Y. Chan, Mark C. Hersam, Nathaniel P. Stern, Tobin J. Marks
Summary: This study investigates the quenching of low-temperature defect photoluminescence in MoS2 following the deposition of metallophthalocyanines. The quenching efficiency is found to depend significantly on the identity of the phthalocyanine metal, with almost no quenching observed in the case of metal-free H2Pc.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Teodor K. Stanev, Pufan Liu, Hongfei Zeng, Erik J. Lenferink, Akshay A. Murthy, Nathaniel Speiser, Kenji Watanabe, Takashi Taniguchi, Vinayak P. Dravid, Nathaniel P. Stern
Summary: Direct top-down nanopatterning of semiconductors is a powerful tool for engineering optoelectronic devices, but it is challenging to apply to two-dimensional materials due to potential performance degradation caused by high-energy electron radiation. We demonstrate the successful fabrication of functional optical nanostructures on two-dimensional semiconductors by encapsulating them with hexagonal boron nitride.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Pufan Liu, Hongfei Zeng, David A. Czaplewski, Nathaniel P. Stern
Summary: Topological photonics is a promising platform for studying light-matter interactions. This study presents a novel valley Hall topological photonic crystal that can support a complete topological band gap in the visible spectrum. By fabricating topological photonic devices, the robust transmission of edge states at energies within the complete band gap is demonstrated.
Article
Nanoscience & Nanotechnology
Erik J. Lenferink, Trevor LaMountain, Teodor K. Stanev, Ethan Garvey, Kenji Watanabe, Takashi Taniguchi, Nathaniel P. Stern
Summary: Transition metal dichalcogenides (TMDs) are a promising solid-state platform for single photon emission. By utilizing local strain engineering and modulation of gate voltages, TMD devices can achieve simultaneous electrical pumping and tuning of localized exciton emission.
Article
Engineering, Electrical & Electronic
Brian P. Downey, Shawn Mack, Andy Xie, D. Scott Katzer, Andrew C. Lang, James G. Champlain, Yu Cao, Neeraj Nepal, Tyler A. Growden, Vikrant J. Gokhale, Matthew T. Hardy, Edward Beam, Cathy Lee, David J. Meyer
Summary: In this study, the micro-transfer printing technique is used to integrate two solid-state RF device technologies, GaN and GaAs high-electron-mobility transistors, on the same interposer. The devices are released from their growth substrate using an epitaxial sacrificial layer, and a thin polymer adhesion layer is used to ensure a strong bond with the target substrate. The results show that the device/interposer interface has no voids, and the polymer adhesion layer has a thickness of 5+/-2 nm. There is no significant degradation in dc electrical characteristics after device transfer for either device technology. The ability to combine different solid-state technologies at the device level with high density offers a promising approach for meeting the demands of next-generation RF and mixed-signal circuits.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Brian P. Downey, Andy Xie, Shawn Mack, D. Scott Katzer, James G. Champlain, Yu Cao, Neeraj Nepal, Tyler A. Growden, Vikrant J. Gokhale, Robert L. Coffie, Matthew T. Hardy, Edward Beam, Cathy Lee, David J. Meyer
2020 DEVICE RESEARCH CONFERENCE (DRC)
(2020)
Article
Materials Science, Multidisciplinary
Pirmin J. Weigele, D. C. Marinescu, Florian Dettwiler, Jiyong Fu, Shawn Mack, J. Carlos Egues, David D. Awschalom, Dominik M. Zumbuehl
