Article
Physics, Multidisciplinary
Hiromitsu Takeuchi
Summary: A novel topological defect, an elliptic vortex, has been identified theoretically in a spin-nematic superfluid under specific conditions. This new vortex structure, considered a Joukowski transform of a conventional vortex, is characterized by its oblateness and its dependence on the Zeeman and spin healing lengths. The theoretical analysis also clarifies the distinction between half quantum vortices in polar and antiferromagnetic phases in spin-1 condensates.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Particles & Fields
Klaas Parmentier
Summary: This study demonstrates that rigidly rotating strings with center of mass at the origin of the dS(3) static patch satisfy the Higuchi bound, showing that strings violating the bound will expand towards the horizon. It also provides an analysis of conserved quantities under Gubser's algebraic evolution equation for segmented strings and randomly generated strings, as well as the tendency for rapidly rotating segmented strings with mass/spin < 1 to eventually have causally disconnected kink collisions. Additionally, the study explores the scenario of cosmic strings captured by a black hole in dS, finding that horizon friction can elongate the strings.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Chemistry, Physical
Petai Pip, Artur Glavic, Sandra Helen Skjaervo, Anja Weber, Andrew Smerald, Kirill Zhernenkov, Naemi Leo, Frederic Mila, Laetitia Philippe, Laura J. Heyderman
Summary: In this study, grazing-incidence small-angle neutron scattering was used to experimentally quantify the spin-liquid-like correlations in highly-frustrated artificial spin systems. Using a newly-developed empirical structure-factor model, the short-range correlated spin-liquid state was accurately described and shown to be in good agreement with theoretical predictions.
NANOSCALE HORIZONS
(2021)
Article
Physics, Multidisciplinary
Owen Benton, Roderich Moessner
Summary: By varying the constraints on a classical spin system, a series of distinct Coulomb liquids can be generated, leading to higher-rank spin liquids and new Coulomb liquids with an abundance of pinch points. This manipulation of topological defects in momentum space establishes a new and general route to uncovering exotic Coulomb liquids.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Robert E. Throckmorton, S. Das Sarma
Summary: The research shows that many-body localization effects can be observed in a finite chain of exchange-coupled spin qubits in semiconductors. The spin-spin correlation function is proposed as a new measured quantity in experiments with potential solid-state quantum computing platforms. The relationship between delocalized and localized phases and the retention of memory in spin-spin correlation functions is studied, with the counterintuitive finding of no clear tendency towards localization with increasing charge noise in small systems.
Article
Chemistry, Multidisciplinary
Susmita Saha, Jingyuan Zhou, Kevin Hofhuis, Attila Kakay, Valerio Scagnoli, Laura J. Heyderman, Sebastian Gliga
Summary: Artificial spin ices are periodic arrangements of nanomagnets with interacting properties that can be used to create functional materials such as magnonic crystals. Symmetry breaking plays a significant role in defining mode profiles, and the mode spectra exhibit signatures of long-range interactions in the system.
Article
Physics, Multidisciplinary
A. Hijano, E. J. Rodriguez, D. Bercioux, D. Frustaglia
Summary: This work investigates the response of spin carriers to effective field textures in curved one-dimensional interferometric circuits, finding that the interplay between Rashba and Dresselhaus spin-orbit interactions and circuit geometry modifies the geometric characteristics of spinors, resulting in the localization of electronic wave function and suppression of quantum conductance.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Multidisciplinary
Min Jiang, Yushu Qin, Xin Wang, Yuanhong Wang, Haowen Su, Xinhua Peng, Dmitry Budker
Summary: This study investigates the amplification of magnetic-field signals using periodically driven Xe-129 spins and observes signal amplification at frequencies of transitions between Floquet spin states. The findings enable simultaneous enhancement and measurement of multiple magnetic fields with at least one order of magnitude improvement, offering the capability of femtotesla-level measurements.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
J. Yoneda, W. Huang, M. Feng, C. H. Yang, K. W. Chan, T. Tanttu, W. Gilbert, R. C. C. Leon, F. E. Hudson, K. M. Itoh, A. Morello, S. D. Bartlett, A. Laucht, A. Saraiva, A. S. Dzurak
Summary: The article demonstrates high-fidelity coherent transport of an electron spin qubit between quantum dots in isotopically-enriched silicon, with a reported polarization transfer fidelity of 99.97% and an average coherent transfer fidelity of 99.4%. The results suggest that this method can reduce the cost of fault-tolerant quantum processors and provide key elements for high-fidelity, on-chip quantum information distribution.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Particles & Fields
Raffaele Marotta, Massimo Taronna, Mritunjay Verma
Summary: The paper analyzes Bosonic, Heterotic, and Type II string theories compactified on a generic torus with constant moduli, deriving a general formula for the couplings between massive string excitations and U(1) gauge fields. The universal nature of these couplings in all theories is confirmed through explicit evaluation of relevant string three-point amplitudes. The gyromagnetic ratio g for massive string states coupled to gauge fields is determined, with specific considerations given for mixed symmetry states and those with zero Kaluza Klein or Winding charges resulting in a g value of 1.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Quantum Science & Technology
Michael Berger, Jamal Berakdar
Summary: Quantum states of systems with classical chaotic dynamics can be scarred, and this study demonstrates how the scarred state can be imaged to a region that does not support scarring. This phantom scar has a significant impact on the spin-dependent system dynamics, as shown by explicit calculations for fidelity and correlation functions. Numerical simulations and analysis for the spin-dependent electron dynamics in semiconductor-based double quantum dots provide insights into the coherent phenomenon of scarring and its localization properties in a narrow spectral window.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Applied
J. Cruddas, G. Ruzzi, B. J. Powell
Summary: A simple two-dimensional model of spin crossover materials leads to the emergence of spin-state smectic phases, which exhibit unique characteristics in terms of breaking rotational symmetry and translational symmetry in one direction only. These smectic phases result in plateaus in the fraction of high-spin metal centers and lines of Bragg peaks in x-ray and neutron scattering structure factors. The ordering of the smectic phases is unidirectional, with residual entropy scaling with the linear dimension of the system, contrasting with spin-state ices and antiferroelastic ordered phases.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Michael Berger, Dominik Schulz, Jamal Berakdar
Summary: Quantum scars refer to enhanced localization of probability density of states in spectral regions with high energy levels. The study showed that spin-dependent scarring occurs in spin-coupled electronic systems, which can be detected through transport measurements or spin-polarized scanning tunneling spectroscopy.
Article
Physics, Multidisciplinary
Xinxin Cai, Elliot J. Connors, Lisa F. Edge, John M. Nichol
Summary: Electron spins in silicon quantum dots are excellent qubits due to their long coherence times, high gate fidelities, and compatibility with advanced semiconductor manufacturing techniques. In this study, we demonstrate that spin-valley coupling in Si enables coherent control of single and multi-electron spin states without oscillating electromagnetic fields. Our results establish spin-valley coupling as a promising mechanism for coherent control of qubits based on electron spins in semiconductor quantum dots.
Article
Astronomy & Astrophysics
Dibakar Roychowdhury
Summary: This Letter explores nonrelativistic string solutions in various subsectors of the SU(1,2 vertical bar 3) SMT strings corresponding to different spin groups and satisfying the respective BPS bounds. Specifically, an explicit analysis of rotating string solutions is conducted in light of recently proposed SMT limits. Additionally, newly constructed SMT limits of type IIB (super) strings on AdS(5) x S-5 are investigated, with corresponding leading order stringy corrections estimated near the respective BPS bounds.
Article
Physics, Multidisciplinary
Sayak Dasgupta, Shu Zhang, Ibrahima Bah, Oleg Tchernyshyov
PHYSICAL REVIEW LETTERS
(2020)
Article
Multidisciplinary Sciences
Oliver Hart, Yuan Wan, Claudio Castelnovo
Summary: The study focuses on the interplay of two types of excitations, spinons and visons, in quantum spin liquids, exhibiting a feedback mechanism influenced by non-trivial mutual statistics. This feedback mechanism has significant implications for the system's thermodynamic and transport properties, as well as its response to temperature changes. The authors predict detectable signatures of non-trivial mutual statistics of fractionalized excitations in gapped topological quantum spin liquids at finite temperature.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Gaoting Lin, Jaehong Jeong, Chaebin Kim, Yao Wang, Qing Huang, Takatsugu Masuda, Shinichiro Asai, Shinichi Itoh, Gerrit Guenther, Margarita Russina, Zhilun Lu, Jieming Sheng, Le Wang, Jiucai Wang, Guohua Wang, Qingyong Ren, Chuanying Xi, Wei Tong, Langsheng Ling, Zhengxin Liu, Liusuo Wu, Jiawei Mei, Zhe Qu, Haidong Zhou, Xiaoqun Wang, Je-Geun Park, Yuan Wan, Jie Ma
Summary: The compound Na2Co2TeO6 (NCTO) is proposed as a potential Kitaev system with a field-induced spin-disordered state, expanding the Kitaev model to 3d compounds and sparking further interest in the spin-orbital effect in quantum magnets.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Zi-Long Li, Masaki Oshikawa, Yuan Wan
Summary: The theoretical study investigates the nonlinear optical response of Tomonaga-Luttinger spin liquids in the context of terahertz two-dimensional coherent spectroscopy. Specifically, the third-order nonlinear magnetic susceptibilities of the XXZ-type spin chain exhibit photon echo, demonstrating the potential of THz 2DCS in probing the dynamical properties of collective excitations in gapless many-body systems. Renormalization-group-irrelevant corrections to the fixed-point Hamiltonian result in dispersion and/or damping of wave packets, which can be sensitively detected by lensing and the photon echo phenomenon.
Article
Materials Science, Multidisciplinary
Rocio Gonzalez-Meza, Oleg Tchernyshyov
Summary: The gyroscopic force on a ferromagnetic soliton reflects spin precession tendencies, and its components increase with soliton velocities. The gyroscopic tensor, a generalization of Thiele's gyrovector, is an important mathematical object with historical roots dating back to Lagrange. We review its applications and history.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Condensed Matter
Oleg Tchernyshyov
Summary: We propose a unified theory for the spin and charge degrees of freedom in a ferromagnet. The spin-transfer torque and spin electromotive force are analyzed from the macroscopic perspective of collective coordinates. The resulting equations of motion demonstrate a balance between conservative, gyroscopic (Berry-phase), and dissipative forces. Furthermore, by introducing the electric charge, we expand the space of collective coordinates. The adiabatic spin-transfer torque and spin electromotive force are found to be gyroscopic forces, while their nonadiabatic counterparts act as dissipative forces.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Yuan Gao, Yu-Chen Fan, Han Li, Fan Yang, Xu-Tao Zeng, Xian-Lei Sheng, Ruidan Zhong, Yang Qi, Yuan Wan, Wei Li
Summary: The recently synthesized NBCP compound is found to be an ideal realization of a S = 1/2 triangular-lattice antiferromagnet with significant easy-axis spin exchange anisotropy. By combining automatic parameter searching and tensor-network simulations, a microscopic model is established to accurately describe the material's properties, fitting well with experimental data.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Condensed Matter
Se Kwon Kim, Oleg Tchernyshyov
Summary: This paper provides a pedagogical introduction to the mechanics of ferromagnetic solitons. It starts with the dynamics of a single spin and develops all the tools needed for describing the dynamics of solitons in a ferromagnet.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Yuchen Fan, Yuan Wan
Summary: We numerically study the bosonic analog of the Kitaev honeycomb model, a minimal model for 4d4/5d4 quantum magnets with honeycomb lattice geometry. By combining Landau theory analysis and quantum Monte Carlo simulations, we construct the phase diagram of this model. Our results show that the phase boundaries between the paramagnetic state and magnetically ordered states are typically fluctuation-induced first-order phase transitions. These findings have potential application to Ru4+- and Ir5+-based honeycomb magnets.
Article
Materials Science, Multidisciplinary
Qi Gao, Yang Liu, Haijun Liao, Yuan Wan
Summary: We numerically compute the second and third-order nonlinear magnetic susceptibilities of an Ising ladder model in the context of two-dimensional coherent spectroscopy using the infinite time-evolving block decimation method. The third-order susceptibility of the model exhibits a robust spinon echo signal in the weak-coupling regime, appearing as a highly anisotropic peak on the frequency plane in the two-dimensional coherent spectrum. This spinon echo peak provides insight into the dynamical properties of the spinons, with the spectral peak corresponding to high-energy spinons suppressed with increasing coupling, while those corresponding to low-energy spinons show no significant changes.
Article
Materials Science, Multidisciplinary
Florian Theuss, Sayak Ghosh, Taishi Chen, Oleg Tchernyshyov, Satoru Nakatsuji, B. J. Ramshaw
Summary: In this study, we measure the full elastic tensors of Mn3Ge and Mn3Sn as a function of temperature and find strong magnetoelastic coupling in their respective antiferromagnetic phase transitions. The discontinuities in bulk moduli at the N??el transitions are significantly larger in Mn3Ge than in Mn3Sn, and we calculate the pressure derivatives of the N??el temperature based on the magnitudes of the discontinuities. Additionally, we measure the in-plane shear modulus in both compounds under different magnetic fields and observe similar behavior. Recent experiments have shown strong piezomagnetism in Mn3Sn, and our results suggest that Mn3Ge may be an even better candidate for this effect.
Article
Materials Science, Multidisciplinary
Stephan Humeniuk, Yuan Wan
Summary: The numerical method presented reproduces fermionic quantum gas microscope experiments in equilibrium by directly sampling pseudodensity matrices, resolving the sign problem in QMC simulations. It allows for the computation of distribution functions of arbitrary quantities defined in occupation number space and facilitates the computation of complicated conditional correlation functions.
Article
Materials Science, Multidisciplinary
Yao Wang, Yuan Wan
Summary: The study focuses on the energy and spin transport of the classical spin liquid in the pyrochlore Heisenberg antiferromagnet in the large S limit. Molecular dynamics calculations show that both energy and spin diffusion constants approach finite limits as temperature approaches zero. These results are explained by an effective disorder model where normal modes propagate in a quasistatic disordered spin background with finite mean free path, leading to finite zero temperature limits of the diffusion constants.
Article
Materials Science, Multidisciplinary
Yao Wang, Stephan Humeniuk, Yuan Wan
Article
Materials Science, Multidisciplinary
Oliver Hart, Yuan Wan, Claudio Castelnovo
