Article
Chemistry, Multidisciplinary
Yotam Wolf, Yizhou Liu, Jiewen Xiao, Noejung Park, Binghai Yan
Summary: Chirality-induced spin selectivity (CISS) refers to the phenomenon where electrons become spin polarized after passing through chiral molecules in a nanoscale transport device or in photoemission experiments. Contrary to common belief, this study finds that both transmitted and reflected electrons exhibit the same type of spin polarization, which is a universal characteristic for two-terminal devices. Chiral molecules act as spin polarizers rather than spin filters, and the direction of spin polarization is determined by the molecule's chirality and the incident direction of the electron. The magnitude of spin polarization is influenced by local spin-orbit coupling in the device.
Article
Physics, Multidisciplinary
Juba Bouaziz, Hiroshi Ishida, Samir Lounis, Stefan Bluegel
Summary: By using multiple scattering theory, it was shown that the generally accepted expression of transverse resistivity in magnetic systems hosting skyrmions needs to be amended by an additional term, the noncollinear Hall effect (NHE). The angular form of the NHE is determined by the magnetic texture, the spin-orbit field of the electrons, and the underlying crystal structure, and its magnitude is proportional to the strength of the spin-orbit interaction. The NHE is essential for decoding two- and three-dimensional spin textures from transport experiments.
PHYSICAL REVIEW LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Yaqi Wang, Huying Zheng, Ziying Tang, Runchen Wang, Xin Luo, Yan Shen, Xun Yang, Kai-Kai Liu, Shuangpeng Wang, Shaozhi Deng, Chong-Xin Shan, Hai Zhu
Summary: In this study, we report a chiral polariton laser achieved through spin-polarization of polariton condensation at room temperature. The chiral behavior of the microcavity breaks spatial inversion symmetry and lifts the energy degeneracy of polariton spin doublets by 11 meV. The polariton laser exhibits stable right-circular polarization due to bosonic condensation occurring only in low-energy spin-up polaritons.
Article
Chemistry, Multidisciplinary
Tzuriel S. Metzger, Harikrishna Batchu, Anil Kumar, Daniil A. Fedotov, Naama Goren, Deb Kumar Bhowmick, Israa Shioukhi, Shira Yochelis, Igor Schapiro, Ron Naaman, Ori Gidron, Yossi Paltiel
Summary: Chirality is a fundamental property in nature, and chiral molecules exist in two forms, each being a mirror image of the other. The chirality of molecules is related to their optical activity, and circular dichroism is often used to determine the chirality of chiral molecules. Recently, the chiral induced spin selectivity (CISS) effect was discovered, showing that electron transfer within chiral molecules depends on the electron's spin. This study found that the CISS properties are similar for the two enantiomers when adsorbed on a metal substrate, while on a nonmetallic surface, the preferred spin depends on the molecule's chirality. The correlation between optical activity and CISS effect suggests a relation to the global polarizability of the molecule.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Xiaodong Zhou, Wanxiang Feng, Yinwei Li, Yugui Yao
Summary: In this study, the emergence of spin-chirality-driven quantum anomalous Hall effect (QAHE) and quantum topological Hall effect (QTHE) is demonstrated by sandwiching a 2D Z(2) topological insulator between two chiral kagome antiferromagnetic single-layers. The QAHE is realized with fully compensated noncollinear antiferromagnetism instead of conventional collinear ferromagnetism. The Chern number can be regulated periodically with the interplay between vector- and scalar-spin chiralities, and the QAHE can even occur without spin-orbit coupling, indicating the rare QTHE. These findings open up a new avenue for antiferromagnetic quantum spintronics based on unconventional mechanisms from chiral spin textures.
Article
Chemistry, Multidisciplinary
Pius Markus Theiler, Christian Ritz, Raphael Hofmann, Andreas Stemmer
Summary: Advanced Kelvin probe force microscopy is used to simultaneously detect the quantum capacitance and surface potential of an a-helical peptide monolayer. These indicators shift when the magnetic polarization or enantiomer is switched. A model based on a triangular quantum well in thermal and chemical equilibrium, along with electron-electron interactions, allows for calculating the electrical potential profile based on the measured data. The combination of the model and measurements supports the theoretical model presented by Fransson et al. in Nano Letters 2021, 21 (7), 3026-3032. Measurements of the quantum capacitance provide a new way to test and refine theoretical models that explain strong spin polarization due to chirality-induced spin selectivity.
Article
Multidisciplinary Sciences
Z. Q. Qiu
Summary: This commentary summarizes recent progress on spin pumping by ferromagnetic resonance in magnetic heterostructures, with a focus on the chirality dependence of the spin current.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
W. Dednam, M. A. Garcia-Blazquez, Linda A. Zotti, E. B. Lombardi, C. Sabater, S. Pakdel, J. J. Palacios
Summary: Spin-orbit coupling induces spin charge interconversion phenomena. Chirality-induced spin-selectivity (CISS) is a case of this effect, appearing in various nonmagnetic systems. The origin of CISS in molecular junctions is debated, and our study reveals the role of symmetries in CISS. Metallic nanocontacts can exhibit spin polarization with reduced symmetry, and achiral molecular junctions can also exhibit spin polarization if the entire junction is chiral. Quantum transport calculations support our findings.
Article
Chemistry, Multidisciplinary
W. Dednam, M. A. Garcia-Blazquez, Linda A. Zotti, E. B. Lombardi, C. Sabater, S. Pakdel, J. J. Palacios
Summary: Spin-orbit coupling leads to various spin-charge interconversion phenomena, one of which is chirality-induced spin-selectivity (CISS). CISS appears in different situations ranging from inorganic materials to molecular devices, and the origin of CISS in molecular junctions is currently debated. This study reveals that both electrode symmetries and molecular symmetries play important roles in the emergence of spin-polarization and CISS. The findings also show that standalone metallic nanocontacts can exhibit spin-polarization when introducing relative rotations that reduce symmetry. Moreover, molecular junctions with achiral molecules can exhibit spin-polarization if the entire junction is chiral in a specific way. The predictions of this study have been confirmed by quantum transport calculations based on density functional theory.
Article
Materials Science, Multidisciplinary
A. Alnor, T. Baekkegaard, N. T. Zinner
Summary: Different topological phases of quantum systems have been a focus of research in recent decades. This study goes beyond typical spin-1/2 systems and explores the realization of higher Chern numbers and the emergence of different topological phases using spin-1 systems. The results show that rich topological phase diagrams can be achieved through numerical and analytical methods, and the realistic implementation of spin-1 systems in superconducting circuits holds promise for experimental verification of these theoretical predictions.
Article
Chemistry, Multidisciplinary
Mengmeng Wei, Xiangqian Lu, Jiawei Qiao, Shenqiang Ren, Xiao-Tao Hao, Wei Qin
Summary: This study reports enantiomeric organic chiral ferrimagnets, where chirality is formed by the molecular torsion caused by the propeller-like arrangement of the donor and acceptor molecules. These materials could bridge the gap between ferromagnetism and antiferromagnetism, making them significant in the field of organic spintronics.
Article
Chemistry, Multidisciplinary
Alessandro Chiesa, Alberto Privitera, Emilio Macaluso, Matteo Mannini, Robert Bittl, Ron Naaman, Michael R. Wasielewski, Roberta Sessoli, Stefano Carretta
Summary: Molecular spins are potential building blocks for future quantum technologies due to the flexibility provided by chemistry. However, their weak interaction with external stimuli makes it difficult to access their state at the single-molecule level. A solution using the chirality-induced spin selectivity effect on electron transfer processes is envisioned, which enables initialization, manipulation, and single-spin readout of molecular qubits and qudits even at relatively high temperatures.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Thomas Schuster, Felix Flicker, Ming Li, Svetlana Kotochigova, Joel E. Moore, Jun Ye, Norman Y. Yao
Summary: The Hopf insulator is a weak topological insulator with conducting edge states protected by an integer-valued linking number invariant, which can be naturally realized in lattices of dipolar-interacting spins. The long-ranged, anisotropic nature of the dipole-dipole interactions allows for the precise detail required in the momentum-space structure, while different spin orientations ensure the necessary structure of the complex phases of the hoppings.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Jiangfan Wang, Yi-Feng Yang
Summary: Magnetic frustrations can enhance quantum fluctuations and lead to exotic topological insulating states in spin systems. When coupled to mobile electrons, they may give rise to unusual non-Fermi liquid or metallic spin liquid states whose nature has not been well explored. By considering a spin current Kondo mechanism in a frustrated Kondo model, a series of non-Fermi liquid phases can be formed.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Materials Science, Multidisciplinary
Jaswinder Pal, Sunil Kumar, Kanika Aggarwal, Sanjeev Kumar, Chi-Liang Chen, Wei-Hsiang Huang, Wei-Nien Su, Anupinder Singh
Summary: A comparative study of Ca, Sr and Ba doped BF-PT binary solid solutions synthesized via solid-state reaction route is reported. The highest remnant polarization and dielectric constant are observed in the BF-PCT system. The AC conductivity increases from the BF-PT system to the BF-BT system. NEXAFS study reveals the influence of hybridization between Pb 6s and O 2p states on the dielectric and ferroelectric properties in the lead-based solid solutions.
MATERIALS CHARACTERIZATION
(2022)
Article
Physics, Multidisciplinary
Takumi Yoshino, Shunsuke Furukawa, Sho Higashikawa, Masahito Ueda
NEW JOURNAL OF PHYSICS
(2019)
Article
Physics, Multidisciplinary
Shunsuke Furukawa, Tsutomu Momoi
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2020)
Article
Physics, Multidisciplinary
Norifumi Matsumoto, Kohei Kawabata, Yuto Ashida, Shunsuke Furukawa, Masahito Ueda
PHYSICAL REVIEW LETTERS
(2020)
Article
Optics
Takumi Yoshino, Shunsuke Furukawa, Masahito Ueda
Summary: We studied binary Bose-Einstein condensates under the influence of synthetic magnetic fields with parallel or antiparallel orientations, finding that both types of fields exhibit the same vortex-lattice phase diagram. By introducing renormalized coupling constants, we showed that the low-energy excitation spectra for the two types of fields are related. The entanglement entropy analysis revealed stronger entanglement between components with intercomponent repulsion (attraction) in parallel (antiparallel) fields, in line with recent studies for a quantum (spin) Hall regime.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Takuhiro Ogino, Ryui Kaneko, Satoshi Morita, Shunsuke Furukawa
Summary: We study the ground-state phase diagram of a spin-21 frustrated XXZ ladder and find four featureless phases with distinct properties. The Haldane-CD transition point in the isotropic model behaves differently in the XXZ model, with additional phases appearing between the transition lines.
Article
Materials Science, Multidisciplinary
Takuhiro Ogino, Shunsuke Furukawa, Ryui Kaneko, Satoshi Morita, Naoki Kawashima
Summary: In this study, a spin-1/2 XXZ model on a two-leg ladder with a four-spin interaction is investigated, revealing eight distinct gapped phases consisting of symmetry-breaking and featureless phases. The presence of Gaussian and Ising transitions between the different phases, as well as the identification of topological phase transitions, highlights the complexity of the system's behavior under certain symmetries.
Article
Optics
Takumi Yoshino, Shunsuke Furukawa, Masahito Ueda
Summary: The study on entanglement entropy and spectrum between components in binary Bose-Einstein condensates revealed anomalous square-root dispersion relation with intercomponent tunneling, and gapped dispersion relation in its absence. These spectral features are linked to long-range interactions within the entanglement Hamiltonian in terms of superfluid velocity and particle density. Unusual long-range interactions were found to be emulated in a subsystem of multicomponent BECs with only short-range interactions, demonstrating volume-law scaling of entanglement entropy with subleading logarithmic corrections.
Article
Materials Science, Multidisciplinary
Takuhiro Ogino, Ryui Kaneko, Satoshi Morita, Shunsuke Furukawa, Naoki Kawashima
Summary: The study investigates a quantum phase transition between a Neel phase and a valence bond solid (VBS) phase in a spin-1/2 two-leg XXZ ladder with a four-spin interaction. The Neel-VBS transition is found to be continuous and belong to the Gaussian universality class, with critical exponents satisfying expected constraints. These critical exponents do not significantly change along the phase boundary as generally allowed for the Gaussian class.
Article
Materials Science, Multidisciplinary
A. Miyata, T. Hikihara, S. Furukawa, R. K. Kremer, S. Zherlitsyn, J. Wosnitza
Summary: The magnetoelastic properties of the quasi-one-dimensional spin-1/2 frustrated magnet LiCuVO4 were investigated under high magnetic fields. The magnetostriction data resembles the magnetization results, and can be explained by an exchange-striction mechanism. Small deviations found in the data may indicate nontrivial changes in local correlations associated with field-induced phase transitions.
Article
Materials Science, Multidisciplinary
R. Cosmic, K. Kawabata, Y. Ashida, H. Ikegami, S. Furukawa, P. Patil, J. M. Taylor, Y. Nakamura
Article
Materials Science, Multidisciplinary
H. Ueda, S. Onoda, Y. Yamaguchi, T. Kimura, D. Yoshizawa, T. Morioka, M. Hagiwara, M. Hagihala, M. Soda, T. Masuda, T. Sakaldbara, K. Tomiyasu, S. Ohira-Kawamura, K. Nakajima, R. Kajimoto, M. Nakamura, Y. Inamura, N. Reynolds, M. Frontzek, J. S. White, M. Hase, Y. Yasui
Article
Materials Science, Multidisciplinary
Akihiko Ikeda, Shunsuke Furukawa, Oleg Janson, Yasuhiro H. Matsuda, Shojiro Takeyama, Takeshi Yajima, Zenji Hiroi, Hajime Ishikawa
Article
Optics
Shunsuke Furukawa, Masahito Ueda
Article
Materials Science, Multidisciplinary
Yuya O. Nakagawa, Shunsuke Furukawa
Article
Materials Science, Multidisciplinary
Masaya Nakagawa, Shunsuke Furukawa
