Article
Materials Science, Multidisciplinary
T. Shang, Y. Xu, D. J. Gawryluk, J. Z. Ma, T. Shiroka, M. Shi, E. Pomjakushina
Summary: The study reports an anomalous Hall resistivity in single crystals of EuAl4, possibly due to the manifestation of the topological Hall effect, which normally occurs in noncentrosymmetric materials.
Article
Materials Science, Multidisciplinary
Makoto Naka, Yukitoshi Motome, Hitoshi Seo
Summary: In this study, the anomalous Hall effect (AHE) in perovskites with antiferromagnetic (AFM) orderings was theoretically investigated. The results showed that AFM ordered states in perovskite materials can exhibit AHE, with different forms depending on the electron orbital filling.
Article
Physics, Multidisciplinary
R. D. Gonzalez Betancourt, J. Zubac, R. Gonzalez-Hernandez, K. Geishendorf, Z. Soban, G. Springholz, K. Olejnik, L. Smejkal, J. Sinova, T. Jungwirth, S. T. B. Goennenwein, A. Thomas, H. Reichlova, J. Zelezny, D. Kriegner
Summary: A spontaneous anomalous Hall signal was observed in an epitaxial film of MnTe, a semiconductor with collinear antiparallel magnetic ordering and zero net magnetization, even in the absence of an external magnetic field. The anomalous Hall effect originates from the unconventional phase with strong time-reversal symmetry breaking and alternating spin polarization. The anisotropic crystal environment of Mn atoms, caused by nonmagnetic Te atoms, plays a vital role in establishing the unconventional phase and generating the anomalous Hall effect.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Jin Cao, Wei Jiang, Xiao-Ping Li, Daifeng Tu, Jiadong Zhou, Jianhui Zhou, Yugui Yao
Summary: An unconventional anomalous Hall effect (IPAHE) induced by an in-plane magnetic field is discovered in PT-symmetric antiferromagnetic systems. This effect is demonstrated in known AFM materials and a new kind of AFM heterodimensional superlattice, showing potential for applications in AFM spintronic devices. Experimental detection methods are briefly discussed.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Kacho Imtiyaz Ali Khan, Ram Singh Yadav, Himanshu Bangar, Akash Kumar, Niru Chowdhury, Prasanta Kumar Muduli, Pranaba Kishor Muduli
Summary: In this study, we investigate the growth of Fe3Sn2 thin films on Si/SiO2 substrates with two different seed layers (Ta and Pt). We find that Pt/Fe3Sn2 thin films form a pure ferromagnetic phase with higher saturation magnetization and exhibit an anomalous Hall coefficient that is two orders of magnitude higher than traditional ferromagnets. These results are important for the development of novel topological spintronic devices.
Article
Chemistry, Physical
Bodong Lv, Rui Zhong, Xiaohua Luo, Shengcan Ma, Changcai Chen, Sujuan Wang, Qing Luo, Fei Gao, Chunsheng Fang, Weijun Ren, Zhenchen Zhong
Summary: The anomalous Hall effect in the kagome ferromagnet YbMn6Sn6 single crystal is observed, where an intrinsic anomalous Hall conductivity of 40.2 omega-1 center dot cm-1 is obtained. YbMn6Sn6 exhibits an easy-plane ferromagnetic structure and the magnetoresistance is positive at low temperatures, transitioning to negative with increasing temperature. These findings suggest that YbMn6Sn6 holds promise as a platform for studying the relationship between magnetic and electronic structure and exploring novel quantum phenomena.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Dong Chen, Congcong Le, Chenguang Fu, Haicheng Lin, Walter Schnelle, Yan Sun, Claudia Felser
Summary: LiMn6Sn6 is a kagome ferromagnet with a large anomalous Hall effect, high ferromagnetism, and easy plane characteristics. Through experiments and calculations, it is found that there is a coexistence of electrons and holes in the material, and the main anomalous Hall effect is attributed to band crossings near the Fermi energy.
Article
Engineering, Electrical & Electronic
Zexin Feng, Xiaorong Zhou, Libor Smejkal, Lei Wu, Zengwei Zhu, Huixin Guo, Rafael Gonzalez-Hernandez, Xiaoning Wang, Han Yan, Peixin Qin, Xin Zhang, Haojiang Wu, Hongyu Chen, Ziang Meng, Li Liu, Zhengcai Xia, Jairo Sinova, Tomas Jungwirth, Zhiqi Liu
Summary: This study reports an anomalous Hall effect in collinear altermagnetic ruthenium dioxide, with an anomalous Hall conductivity exceeding 1,000 omega(-1) cm(-1). The phenomenon arises from an alternative magnetic phase in RuO2, characterized by alternating spin polarization in both real-space crystal structure and momentum-space band structure. The results could potentially lead to the exploration of topological Berry phases and dissipationless quantum transport in crystals of abundant elements and with a compensated antiparallel magnetic order.
NATURE ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
M. Umar Farooq, Zhigang Gui, Li Huang
Summary: The discovery of new nontrivial degrees of freedom of Bloch electrons is a significant subject in condensed matter physics. Current research focuses on the interaction between the spin-orbit coupling-induced pseudospin valley state and time inversion asymmetry. In this study, a distinct magnetic order-protected, momentum-dependent spin-splitting valley state (SSV) is proposed in polar bulk BiFeO3. The octahedral distortion-induced spatial asymmetry breaks spin degeneracy and time-reversal symmetry, giving rise to SSV polarization and resulting in nonzero anomalous Hall conductivity and magneto-optical effects. The ferroelectric nature of BiFeO3 allows for straightforward tunability of these unconventional magneto-optical effects and anomalous Hall conductivity under an electric field.
Article
Materials Science, Multidisciplinary
A. C. Duran, S. A. Osorio, M. B. Sturla
Summary: We studied the anomalous Hall effect on the antiferromagnetic coloring-triangular lattice with spin-orbit interaction. Our results show that a finite Hall conductivity occurs in the planar 120° structure with finite spin-orbit coupling, and a quantized Hall conductivity appears at global band gaps resulting from a topologically nontrivial band structure.
Article
Materials Science, Multidisciplinary
Yuanyuan Wang, Zheng Chen, Yong Nie, Yong Zhang, Qun Niu, Guolin Zheng, Xiangde Zhu, Wei Ning, Mingliang Tian
Summary: We systematically investigated the magnetoresistance and Hall resistivity of the kagome superconductor RbV3Sb5 single crystals. The crystals exhibit multiple-frequency quantum oscillations, indicating the presence of three two-dimensional bands with light effective quasiparticle mass and nontrivial Berry phase. We also observed a giant anomalous Hall conductivity in RbV3Sb5, which is correlated with the charge-density wave order.
Article
Materials Science, Multidisciplinary
Yao Zhang, Simon Granville
Summary: In this study, the origin of the anomalous Hall effect (AHE) peak in Mn2CoAl/Pd thin films is investigated. By directly imaging the magnetic domain structures, it is determined that the peak does not originate from topologically nontrivial spin textures. A model is also proposed, based on the contributions from Mn2CoAl and a CoPd alloy, to explain the thickness and temperature behaviors of the peak.
Article
Physics, Multidisciplinary
V. K. Kozin, V. A. Shabashov, A. Kavokin, I. A. Shelykh
Summary: This study reveals that even in the absence of external electric fields, electrically neutral excitons can be influenced by crossed electric and magnetic fields, changing the direction of their propagation. The anomalous exciton Hall effect proposed in this research can be used for spatial separation of dark and bright excitons.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Hui Liu, Heng Wang, Zhisheng Peng, Jiyou Jin, Zhongpu Wang, Kang Peng, Wenxiang Wang, Yushi Xu, Yu Wang, Zheng Wei, Ding Zhang, Yong Jun Li, Weiguo Chu, Lianfeng Sun
Summary: In this work, a gate-tunable Hall resistance (R-xy) is reported in edge-bonded monolayer graphene without an external magnetic field. The Hall resistance consists of contributions from both the ordinary Hall effect and the anomalous Hall effect (R-AHE). At a temperature of 2 K, plateaus of R-xy and R-AHE at 0.94h/3e(2) and 0.88h/3e(2) respectively are observed, indicating the quantum version of the AHE. At a temperature of 300 K, R-xy exhibits a positive, giant magnetoresistance of about 177%, while R-AHE remains at a value of about 400 Ω. These findings suggest the presence of a long-range ferromagnetic order in pristine graphene, which could have applications in pure carbon-based spintronics.
NANOSCALE HORIZONS
(2023)
Article
Chemistry, Multidisciplinary
Kang Jia, Xiao-Jing Dong, Sheng-Shi Li, Wei-Xiao Ji, Chang-Wen Zhang
Summary: Topology and ferrovalley (FV) are important concepts in emerging device applications and fundamental research. However, the coupling between FV and topology in a single system is rarely reported. In this study, stable intrinsic FV ScBrI semiconductor with high Curie temperature (TC) is predicted using Monte Carlo simulations and first-principles calculations. Strain engineering can induce transitions from FV to half-valley-metal (HVM), to valley-nonequilibrium quantum anomalous Hall effect (VQAHE), to HVM, and back to FV. No specific valley polarization and VQAHE states are observed under in-plane (IP) magnetic anisotropy.
Article
Physics, Multidisciplinary
J. Zakrzewski
Summary: In this dedication to Professor Iwo Bialynicki-Birula on his 90th birthday, the author attempts to demonstrate the resemblance between dynamical quantum phase transitions and standard Rabi oscillations in the Loschmidt rate dynamics. Furthermore, a possible connection between Loschmidt echo singularities and quantum scars is suggested.
ACTA PHYSICA POLONICA A
(2023)
Review
Physics, Multidisciplinary
Jakub Zakrzewski
Summary: This article reviews the application of level dynamics to spectra of quantally chaotic systems. It shows that the statistical mechanics approach provides predictions about intermediate level statistics between integrable and chaotic dynamics. Different statistical measures involving level dynamics, such as level avoided-crossing distributions, level slope distributions, or level curvature distributions, are discussed in detail. The aspects of universality in these distributions and their limitations are shown. Measures imported from the quantum information approach, such as the fidelity susceptibility and geometric tensor matrix elements, are examined in more detail. Possible open problems are also suggested.
Article
Physics, Multidisciplinary
H. Jiang, M. Mandrysz, A. Sanchez, J. Dura, T. Steinle, J. S. Prauzner-Bechcicki, J. Zakrzewski, M. Lewenstein, F. He, J. Biegert, M. F. Ciappina
Summary: This study investigates the non-sequential double ionization (NSDI) in argon induced by a 3100 nm laser source through joint experimental and theoretical approaches. The correlated photoelectron momentum distribution (PMD) is found to strongly depend on the pulse duration, which can be explained by an envelope-induced intensity effect. The laser vector potential at the ionization time of the bound electron is influenced by the pulse duration, leading to different drift momenta. This work highlights the significance of pulse duration in NSDI and enhances our understanding of strong field tunnel-recollision dynamics under mid-IR laser fields.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Tomasz Szoldra, Marcelo F. Ciappina, Nicholas Werby, Philip H. Bucksbaum, Maciej Lewenstein, Jakub Zakrzewski, Andrew S. Maxwell
Summary: Deep learning models, particularly convolutional neural networks (CNNs), have shown great interpretability for image-like data. In this study, CNNs were tested on strong-field ionization photoelectron spectra to 'invert' experimental data and extract reliable laser intensity uncertainties. The study also highlights the importance of data augmentation techniques and accounting for detector saturation in training the models.
NEW JOURNAL OF PHYSICS
(2023)
Article
Optics
H. Korbmacher, P. Sierant, W. Li, X. Deng, J. Zakrzewski, L. Santos
Summary: Strong intersite interactions in disorder-free lattice systems can lead to a lack of ergodicity. Ultracold dipolar gases in optical lattices offer an experimental platform to study this physics. The decay of dipolar intersite interactions is usually assumed to follow a fixed power law. However, we demonstrate that in a one-dimensional polar lattice gas, the actual decay depends on the transversal confinement, significantly affecting particle dynamics. Our results suggest that disorder-free localization and the role of interaction decay can be flexibly studied in experiments with polar gases.
Article
Materials Science, Multidisciplinary
Piotr Sierant, Titas Chanda, Maciej Lewenstein, Jakub Zakrzewski
Summary: We investigate the dynamics of a single mobile impurity in a bath of Anderson localized particles in the regime of relatively strong disorder and interactions. We find that at short times, there is evidence of many-body localization, but at longer timescales, the impurity spreads subdiffusively and gradually delocalizes the Anderson insulator. The observed phenomenology includes subdiffusive growth of mean square displacement, power-law decay of density correlation functions, and power-law growth of entanglement entropy.
Article
Materials Science, Multidisciplinary
Jakub Janarek, Jakub Zakrzewski, Dominique Delande
Summary: In this study, we numerically investigate the impact of many-body interactions on the quantum boomerang effect. We consider different cases including weakly interacting bosons, the Tonks-Girardeau gas, and strongly interacting bosons. Using the time-evolving block decimation algorithm, we perform numerical simulations. Our results show that for weakly interacting bosons, the quantum boomerang effect is partially destroyed, consistent with previous mean-field studies. However, for the Tonks-Girardeau gas, we observe the presence of the full quantum boomerang effect. In the case of strongly interacting bosons, a partial boomerang effect is observed. Furthermore, we demonstrate that the destruction of the quantum boomerang effect is universal and independent of the detailed particle interactions.
Article
Materials Science, Multidisciplinary
Piotr Sierant, Maciej Lewenstein, Antonello Scardicchio, Jakub Zakrzewski
Summary: We use a polynomially filtered exact diagonalization algorithm to study the many-body localization (MBL) transition in disordered Floquet systems. We focus on the disordered kicked Ising model and demonstrate quantitatively that finite-size effects at the MBL transition are less severe than in the random field XXZ spin chains commonly studied in the context of MBL. Our findings also apply to other disordered Floquet models, showing smaller finite-size effects than those observed in typical disordered autonomous spin chains. We observe consistent indications of the MBL transition for several indicators of ergodicity breaking in the kicked Ising model. Additionally, we find that assuming a power-law divergence of the correlation length at the MBL transition yields a critical exponent nu approximately equal to 2, in agreement with the Harris criterion for one-dimensional disordered systems.
Article
Materials Science, Multidisciplinary
Adith Sai Aramthottil, Mateusz Lacki, Luis Santos, Jakub Zakrzewski
Summary: Intersite dipolar interactions induce nonergodic dynamics for dipolar bosons in an optical lattice, even without disorder. The neglected inherent dipole-induced density-dependent tunneling plays a crucial role in this dynamics. Delocalization is strengthened with increasing dipolar strength, in contrast to the case of hard-core bosons. Interaction-induced hopping should play a crucial role in future experiments on the dynamics of polar lattice gases.
Article
Materials Science, Multidisciplinary
Tomasz Szoldra, Piotr Sierant, Maciej Lewenstein, Jakub Zakrzewski
Summary: In this study, we introduce a correlation function difference (CFD) based on local density correlation functions for a one-dimensional spin system. By comparing correlations on a given site between a full system and its restriction, CFD provides useful information on transfer of information in quantum many-body systems. We investigate the examples of different phases in a disordered XXZ spin chain and find that CFD exhibits different behaviors in the ergodic and many-body localized regimes.
Article
Materials Science, Multidisciplinary
Bitan De, Gabriela Wojtowicz, Jakub Zakrzewski, Michael Zwolak, Marek M. Rams
Summary: Extended reservoirs provide a framework for studying quantum transport systems and capturing the physical response. The stability criteria can help identify the appropriate relaxation rate for capturing the continuum limit response. This approach recovers well-understood physical behavior and can be used to study strong coupling and nonlinear response.
Article
Materials Science, Multidisciplinary
Titas Chanda, Rebecca Kraus, Jakub Zakrzewski, Giovanna Morigi
Summary: In this work, we numerically investigate the phase diagram of bosons tightly trapped in an optical lattice and dispersively coupled to a single-mode cavity field. Our study reveals the emergence of bond orders due to correlated tunneling, leading to one insulating and two gapless bond-ordered phases. We also analyze the scaling of entanglement entropy in the gapless bond-ordered phases resulting from global interactions.
Article
Materials Science, Multidisciplinary
Piotr Sierant, Jakub Zakrzewski
Summary: This study investigates the time dynamics of 1D disordered Heisenberg spin-1/2 chains and finds that the regime of slow power-law decay of imbalance persists even at disorder strengths exceeding the critical disorder strength for many-body localization (MBL). However, when the disorder is replaced by a quasiperiodic potential, an emergence of a stable pattern of imbalance oscillations is observed. The study highlights the challenges in experimentally observing MBL phenomenon.
Article
Materials Science, Multidisciplinary
Rebecca Kraus, Titas Chanda, Jakub Zakrzewski, Giovanna Morigi
Summary: In this article, a theoretical analysis of the phase diagram of a quantum gas of bosons interacting via repulsive dipolar interactions is conducted. Numerical techniques are used to evaluate the phase diagram for unit density, revealing a significant impact of correlated tunneling on the parameter range of the topological insulator phase.
Article
Materials Science, Multidisciplinary
Adith Sai Aramthottil, Utso Bhattacharya, Daniel Gonzalez-Cuadra, Maciej Lewenstein, Luca Barbiero, Jakub Zakrzewski
Summary: This study reveals the occurrence of QMBSs in a specific regime of a lattice gauge theory and provides an example where QMBSs appear in a regime where charges are deconfined. Numerical and analytical approaches are used to trace the existence of scarred states by analyzing the analytically reachable limit and demonstrating persistent oscillations for specific initial states through quantum quenches.
