Article
Multidisciplinary Sciences
Cheng Chi, Qiao Jiang, Zhixin Liu, Liheng Zheng, Meiling Jiang, Han Zhang, Feng Lin, Bo Shen, Zheyu Fang
Summary: The study demonstrates selective manipulation of photon spin angular momentum at a deep subwavelength scale via electron-induced OSHE in Au nanoantennas, suggesting an information encoding scheme with robustness, privacy, and high level of integration for future quantum applications.
Article
Chemistry, Multidisciplinary
Huisheng Zhang, Yingying Wang, Wenjia Yang, Jingjing Zhang, Xiaohong Xu, Feng Liu
Summary: The study shows that epitaxial growth of plumbene on the BaTe(111) surface can transform the trivial Pb lattice into a quantum spin Hall (QSH) phase with a large gap. Surface adsorption of H or halogen atoms can further increase the gap, demonstrating the potential for exploring large-gap QSH insulators in heavy-metal-based materials.
Article
Materials Science, Multidisciplinary
Xiangting Hu, Ning Mao, Hao Wang, Ying Dai, Baibiao Huang, Chengwang Niu
Summary: The study demonstrates that the QSH phase can survive under antiferromagnetic long-range order in a RbCuSe/CsMnP heterobilayer, exhibiting topological nontrivial features. The role of effective spin-orbit coupling and antiferromagnetism is discussed to reveal the underlying physical mechanism. These findings may lead to advancements in topological magnetism and antiferromagnetic spintronics.
Article
Materials Science, Multidisciplinary
Kyriakos Flouris, Miller Mendoza Jimenez, Hans J. Herrmann
Summary: In this study, we report the numerical observation of a curvature-induced spin-Hall effect in a monolayer graphene Mobius strip. By solving the Dirac equation on a nontrivial and non-Euclidean manifold, we reveal that a spin-Hall current is a natural consequence for such a topology, despite the absence of a Hall current.
Article
Materials Science, Multidisciplinary
N. Sluchanko, A. Azarevich, A. Bogach, S. Demishev, K. Krasikov, V. Voronov, V Filipov, N. Shitsevalova, V Glushkov
Summary: A comprehensive study of magnetoresistance and Hall effect in nonmagnetic metal LuB12 single crystals was conducted, revealing an anomalous positive contribution to Hall effect and its association with magnetoresistance peak. The metal exhibits inhomogeneous distribution of electron density, and various scenarios involving Fermi surface topology, relaxation time of charge carriers, and interaction with external magnetic field and fluctuating charge stripes were analyzed. The origin of SdH oscillations in this nonequilibrium metal with electron phase separation and strong charge carrier scattering was discussed.
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
Slawomir P. Lepkowski
Summary: In this study, the quantum spin Hall effect in InN/InGaN coupled multiple quantum wells is theoretically studied. It is found that a topological insulator can be achieved in triple quantum wells when the In content in the interwell barriers is greater than or equal to the In content in the external barriers. In quadruple quantum wells, a topological insulator phase can only be achieved when the In content in the interwell barriers is larger than in the external barriers.
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
Materials Science, Multidisciplinary
R. S. Nair, M. S. Rang, Paul J. Kelly
Summary: A density-functional-theory-based relativistic scattering formalism was used to study charge transport through thin Pt films with room-temperature lattice disorder. The research found that a Fuchs-Sondheimer specularity coefficient is needed to describe the suppression of charge current at the surface, even in the absence of surface roughness. It was also discovered that the spin Hall effect is substantially enhanced at the surface, with a reduced value of the spin Hall angle.
Article
Materials Science, Multidisciplinary
Xiaoyu Cheng, Xiaohong Zheng, Jun Chen, Liantuan Xiao, Suotang Jia, Lei Zhang
Summary: Recently, the interesting reentrant phenomena in quantum Hall effect (QHE), quantum anomalous Hall effect (QAHE), and non-Hermitian systems have been discussed. In this study, the reentrant phenomena in quantum spin Hall effect (QSHE) are achieved by introducing a uniform exchange field into a topological insulator with a four-band model Hamiltonian. Both time-reversal symmetry broken QSHE and spin-polarized QAHE are simultaneously generated in the system with proper exchange field strength. The topological protection and robustness of induced QSHE and QAHE are verified through analyzing the spin-Chern number and transmission in the presence of random disorders. Furthermore, the theoretical realization of reentrant QSHE in a topolectrical circuit is demonstrated.
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
Materials Science, Multidisciplinary
Damian Tomaszewski, Piotr Busz, Jan Martinek
Summary: This paper provides a detailed theoretical description of the influence of spin accumulation in metallic Fermi leads on the Kondo effect in systems such as quantum dots and Kondo alloys. The study shows that the presence of spin accumulation, magnetic field, and ferromagnetic leads spin polarization can suppress the Kondo effect, but for appropriately selected parameter values, these effects can compensate each other and may lead to the restoration of the Kondo effect in the analyzed systems. The paper also discusses recent experiments related to spin current in Kondo alloys.
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, 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.
Article
Physics, Multidisciplinary
Martin Speight, Thomas Winyard, Egor Babaev
Summary: We investigate the magnetic response of nematic superconductors and propose a new method to find vortex and skyrmion structures beyond symmetrical constraints. Our study shows distinctive skyrmion stripes in nematic superconductors. Our method enables accurate determination of the field distribution for muon spin rotation probes and reveals a double peak in the field distribution for skyrmion structure, which is significantly different from the signal of standard vortex lattices.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Richard Hess, Henry F. Legg, Daniel Loss, Jelena Klinovaja
Summary: In this study, we investigate a one-dimensional Rashba nanowire with multiple Andreev bound states forming an Andreev band in the bulk. We demonstrate that, under certain conditions, this trivial Andreev band can exhibit a noticeable closing and reopening of the bulk band gap in the nonlocal conductance of the nanowire. Additionally, we find that the presence of trivial zero-bias peaks in the local conductance at the ends of the nanowire does not significantly affect the existence of the trivial bulk reopening signature. The coexistence of the trivial bulk reopening signature and zero-bias peaks mimics the essential characteristics required for the topological gap protocol, providing a topologically trivial minimal model for benchmarking the applicability of this protocol.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Daniel Miller, Daniel Loss, Ivano Tavernelli, Hermann Kampermann, Dagmar Bruss, Nikolai Wyderka
Summary: The Shor-Laflamme distribution is a set of local unitary invariants that measure k-body correlations in a quantum state. We demonstrate that the distribution of graph states can be obtained by solving a graph-theoretical problem, allowing for the calculation of mean and variance using graph properties. We also derive closed expressions for the distribution of certain graph state families. Our results provide insights into quantum error-correcting codes and the geometry of quantum states. We propose an entanglement criterion based on the Shor-Laflamme distribution, which can be applied to higher-dimensional systems.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Physics, Multidisciplinary
J. Yoneda, J. S. Rojas-Arias, P. Stano, K. Takeda, A. Noiri, T. Nakajima, D. Loss, S. Tarucha
Summary: Research shows strong noise correlation between neighboring silicon spin qubits, with electric field fluctuations creating strongly correlated errors.
Article
Materials Science, Multidisciplinary
Renato M. A. Dantas, Henry F. Legg, Stefano Bosco, Daniel Loss, Jelena Klinovaja
Summary: We examine the nonlinear transport characteristics resulting from linear and cubic spin-orbit interactions in one-dimensional and two-dimensional systems. By combining analytical responses at zero temperature with numerical analysis at finite temperature, we establish a method to differentiate between linear and cubic spin-orbit interactions. Additionally, we propose a protocol to determine material parameters using transport measurements under realistic conditions, with Ge heterostructures as an exemplification. Our findings offer a means to rapidly benchmark spin-orbit properties in semiconductor nanostructures.
Article
Materials Science, Multidisciplinary
Katharina Laubscher, Dmitry Miserev, Vardan Kaladzhyan, Daniel Loss, Jelena Klinovaja
Summary: We study the spin configurations of magnetic impurities near the edge of a two-dimensional topological superconductor through both analytical and numerical methods. We find that the spin of a single impurity tends to align along the edge due to the interaction between the impurity and the gapless Majorana edge states. Additionally, when two impurities are placed close to the edge, the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between them is mainly mediated by the Majorana edge states, resulting in a ferromagnetic alignment of the spins along the edge. This effect can be utilized for detecting the helical Majorana edge states.
Article
Materials Science, Multidisciplinary
Clara S. Weber, Mikhail Pletyukhov, Zhe Hou, Dante M. Kennes, Jelena Klinovaja, Daniel Loss, Herbert Schoeller
Summary: We uncover the fundamental connection between supersymmetry (SUSY) and a wide class of two-dimensional (2D) second-order topological insulators (SOTI). This connection arises from applying a half-integer Aharonov-Bohm flux through a hole in the system. The presence of chiral symmetry, inversion symmetry, and mirror symmetry is crucial in establishing this link. We show that at a half-integer flux, the mirror symmetry and inversion symmetry lead to a nontrivial SUSY representation for the Hamiltonian in each chiral sector. This results in the presence of zero-energy states and exact twofold degeneracy of eigenstates with nonzero energy even in finite-sized systems.
Article
Materials Science, Multidisciplinary
Aleksandr E. Svetogorov, Daniel Loss, Jelena Klinovaja
Summary: We analyze the results of a recent experiment and find that the observed effects are a result of the enhancement of the Kondo effect due to the unusual geometry. We propose that this setup provides a unique and convenient system to study the competition between superconductivity and the Kondo effect, with significant advantages over other approaches.
Article
Materials Science, Multidisciplinary
Katharina Laubscher, Pim Keizer, Jelena Klinovaja
Summary: We have constructed a three-dimensional second-order topological insulator using weakly tunnel-coupled Rashba nanowires, which exhibits gapless helical hinge states. By choosing suitable interwire tunnelings, we have demonstrated that the system has fully gapped bulk and surfaces, while hosting gapless helical hinge states along a path of hinges determined by the interwire tunnelings hierarchy and boundary termination. Moreover, our coupled-wires approach allows for the incorporation of electron-electron interactions, and at specific filling factors, we have shown that strong enough electron-electron interactions can drive the system into a fractional second-order topological insulator phase with hinge states carrying only a fraction e/p of the electronic charge e for an odd integer p.
Article
Materials Science, Multidisciplinary
Alexander Mook, Rhea Hoyer, Jelena Klinovaja, Daniel Loss
Summary: We study quantum condensed matter systems where particle number is not conserved, leading to topological anticrossings in the spectrum due to hybridization of states from different particle-number sectors. This phenomenon is observed in fully saturated spin-anisotropic quantum magnets, where single magnons hybridize with magnon bound pairs. The resulting chiral edge excitations are composite particles with mixed spin-multipolar character, showing genuine quantum mechanical effects that vanish in the classical limit. These findings have implications for intrinsic anomalous Hall-type transport, suggesting that fully polarized quantum magnets can serve as a promising platform for studying topological effects caused by hybridizations between particle-number sectors.
Article
Materials Science, Multidisciplinary
Melina Luethi, Katharina Laubscher, Stefano Bosco, Daniel Loss, Jelena Klinovaja
Summary: Planar Josephson junctions made of semiconductors with strong spin-orbit interaction (SOI) offer a promising platform for hosting Majorana bound states (MBSs). Previous studies focused on electron gases with linear momentum-dependent SOI, whereas a two-dimensional hole gas in planar germanium (Ge) exhibits cubic momentum-dependent SOI. However, we demonstrate that due to its particularly large SOI, Ge is a favorable material for MBS emergence. Using a discretized model, we numerically simulate a Ge planar Josephson junction and find that even cubic SOI can lead to the formation of MBSs. Interestingly, we observe an asymmetric phase diagram in the presence of cubic SOI. Furthermore, trivial Andreev bound states can mimic the signatures of MBSs in a Ge planar Josephson junction, posing challenges for experimental detection.
Article
Materials Science, Multidisciplinary
Silas Hoffman, Daniel Loss, Yaroslav Tserkovnyak
Summary: Spin superfluidity in low-dimensional systems with small spins suffers from strong quantum fluctuations, affecting its topological protection. By studying spin transport through a finite spin-1/2 magnetic chain, we investigate the inheritance of spin superfluidity from classical magnets. We show that the topological properties of semiclassical spin superfluids are related to topological superconductivity in the fermionic representation. In particular, we observe efficient spin transmission through the magnetic region at a characteristic resonant length, which is influenced by the boundary Majorana zero modes.
Article
Materials Science, Multidisciplinary
Melina Luethi, Henry F. Legg, Katharina Laubscher, Daniel Loss, Jelena Klinovaja
Summary: In this study, we investigate superconductor-normal-superconductor-normal-superconductor (SNSNS) planar Josephson junctions in hole systems. By manipulating the superconducting phase difference, we demonstrate the possibility of achieving a topological superconducting phase with Majorana bound states, which overcomes previous experimental challenges.
Article
Physics, Applied
J. S. Rojas-Arias, A. Noiri, P. Stano, T. Nakajima, J. Yoneda, K. Takeda, T. Kobayashi, A. Sammak, G. Scappucci, D. Loss, S. Tarucha
Summary: In this study, we detected correlations in qubit-energy fluctuations of non-neighboring qubits in isotopically purified Si/Si-Ge quantum dots. The correlation coefficient reached 10% for a next-nearest-neighbor qubit-pair separated by 200 nm at low frequencies where the noise is strongest. We also found correlations with the charge-sensor signal reaching up to 70%, proving the electrical origin of the observed noise. A simple theoretical model accurately reproduced the measurements and predicted a polynomial decay of correlations with interqubit distance. These results quantify the long-range correlations of noise in quantum-dot spin-qubit arrays, which are essential for scalability and fault tolerance.
PHYSICAL REVIEW APPLIED
(2023)
