Article
Materials Science, Multidisciplinary
Duk-Hyun Choe, Sunghyun Kim, Taehwan Moon, Sanghyun Jo, Hagyoul Bae, Seung-Geol Nam, Yun Seong Lee, Jinseong Heo
Summary: A new topological class of domain walls in orthorhombic HfO2 was discovered, revealing an atomic-scale mechanism of polarization switching with unexpectedly low energy barriers of domain wall motion. This challenges previous beliefs and provides a strategy to reduce coercive fields in HfO2-based ferroelectric devices.
Article
Materials Science, Multidisciplinary
N. B. Devlin, T. Ferrus, C. H. W. Barnes
Summary: This study explores the emergence of spin-polarized flat bands at head-to-head domain walls in topological insulator heterostructures. By tuning the width of the domain wall, the functional form of bound states can be controlled. The number of layers in a multilayer sample affects the electronic dispersion, with odd-layer samples exhibiting particle-hole symmetry and linearly dispersing topologically nontrivial states around E=0, while even-layer samples lack such symmetry and result in a gapped system with spin-polarized flat bands.
Article
Physics, Multidisciplinary
L. B. Drissi, E. H. Saidi
Summary: The research fills in some of the missing results in the engineering of domain walls supporting gapless states for systems with three vertical hinges. The skeleton matrices housing the particle states responsible for physical properties are classified by the Euler characteristic into three sets, and a model invariant under the reflections of the D3 symmetry of triangle is developed, while candidate materials are suggested to capture the tri-hinge states.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Physics, Multidisciplinary
Yandong Li, Chongxiao Fan, Xiaoyong Hu, Yutian Ao, Cuicui Lu, C. T. Chan, Dante M. Kennes, Qihuang Gong
Summary: This Letter investigates photonic topological insulators with different types of gain-loss domain walls and proposes a method for constructing effective Hamiltonians. Additionally, it studies domain-induced higher-order topological states in two-dimensional non-Hermitian lattices and successfully explains these phenomena. The results reveal the physics in manipulating non-Hermitian topological states using gain-loss domain walls in photonic topological insulators.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Juan Zurita, Charles E. Creffield, Gloria Platero
Summary: In this study, transfer protocols in multidomain SSH chains and Creutz ladders are proposed, which remove the exponential dependence and significantly speed up the process compared to single-domain cases. The protocols also reduce error accumulation and improve performance, even in the presence of symmetry-breaking disorder. The localization properties of the Creutz ladder are leveraged to select the two states along the ladder for swapping during the transfer protocol, without disturbing the states located in the intermediate walls between them. This provides a 1D network with all-to-all connectivity that can be useful for quantum information purposes.
Article
Materials Science, Multidisciplinary
Yan-Feng Zhou
Summary: In this study, the electric transport properties at the domain walls of magnetic topological insulators were investigated numerically. Two devices, a domain wall bridge and a Fabry-Perot interferometer, were proposed. It was found that the resistance state of the domain wall bridge can be changed by altering its configuration, and quantum interference of chiral edge modes in the Fabry-Perot interferometer persists under a perpendicular magnetic field. These findings highlight the potential applications of magnetic topological insulators' domain walls in low-power-dissipation spintronic devices.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Chemistry, Physical
W. Schranz, A. Troester, I. Rychetsky
Summary: In this work, we studied the polar properties of domain walls using a method that combines layer group analysis with order parameter symmetry. Through this method, we gained a detailed overview of the microscopic and macroscopic properties of domain walls, which we quantified with results from Landau-Ginzburg-Devonshire theory. The method was also applied to analyze the symmetry and polar properties of ferroelastic twin walls and antiphase boundaries in SrTiO3, providing insights into the elastic anomalies observed at various temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Mathematics, Interdisciplinary Applications
Boquan Ren, Yaroslav Kartashov, Hongguang Wang, Yongdong Li, Yiqi Zhang
Summary: Topological edge states can form in periodic materials with specific degeneracies in their modal spectra under the breaking of certain symmetries. Unconventional topological edge states can exist in Floquet insulators based on arrays of helical waveguides with hybrid edges, even if the hybrid edges are long. These edge states are topologically protected and persist in the presence of focusing nonlinearity of the material, expanding the variety of geometrical shapes in which topological insulators can be constructed.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Astronomy & Astrophysics
E. Babichev, D. Gorbunov, S. Ramazanov, A. Vikman
Summary: Cosmic domain walls are harmless if their tension decreases with the expansion of the Universe. The tension can be large in the early Universe without conflicting observations if it is induced dynamically through interaction with hot primordial plasma. These topological defects can serve as a powerful source of gravitational waves due to their large initial tension.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Multidisciplinary
Quan Lin, Tianyu Li, Lei Xiao, Kunkun Wang, Wei Yi, Peng Xue
Summary: Non-Hermiticity significantly enriches the properties of topological models, leading to exotic features such as non-Hermitian skin effects and non-Bloch bulk-boundary correspondence. The interplay between non-Hermiticity and quasiperiodicity in non-Hermitian quasicrystals results in the concurrence of phase transitions, PT-symmetry breaking, and the onset of non-Hermitian skin effects. The experimental simulation using photonic quantum walks shows the system transitioning from a delocalized, PT-symmetry broken phase with non-Hermitian skin effects to a localized, PT-symmetry unbroken phase with no non-Hermitian skin effects, confirming the topological origin of the phase transition and providing evidence for mobility edges induced by non-Hermiticity.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Natascha Hedrich, Kai Wagner, Oleksandr V. Pylypovskyi, Brendan J. Shields, Tobias Kosub, Denis D. Sheka, Denys Makarov, Patrick Maletinsky
Summary: The study demonstrated manipulation and interaction of antiferromagnetic domain walls using isolated 180 degree domain walls in a single crystal of Cr2O3, proposing a memory architecture based on topographically defined antiferromagnetic domain walls. These results advance the understanding of domain wall mechanics in antiferromagnets.
Article
Materials Science, Multidisciplinary
Kevin F. Garrity, Sugata Chowdhury, Francesca M. Tavazza
Summary: Researchers have developed a first-principles-based tight-binding model to study the behavior of the topological surface state of MnBi(2)Te(4) as a function of temperature, finding that domain wall zero-gap states may resemble high-temperature topological surface states when averaged over many domain sizes, potentially reconciling theoretical predictions with experimental results.
PHYSICAL REVIEW MATERIALS
(2021)
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
Physics, Multidisciplinary
Junjie Zeng, Rui Xue, Tao Hou, Yulei Han, Zhenhua Qiao
Summary: In this study, we theoretically investigate the construction and quantum transport properties of topological conducting domain walls between AB/BA stacking regions in bilayer graphene systems with tunable twisting angles. We find that the lattice reconstruction is more significant for smaller twisting angles, leading to sharper domain boundaries. Additionally, we observe robust behavior and a specific current partition law among conducting channels for topological zero-line modes localized at the domain walls.
FRONTIERS OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Ze-Lin Kong, Zhi-Kang Lin, Jian-Hua Jiang
Summary: This study demonstrates that a local artificial gauge flux can serve as a robust probe of Wannier-type higher-order topological insulators, even when chiral symmetry is broken. Observable signatures include the emergence of cyclic spectral flows traversing one or multiple band gaps, which are associated with local modes bound to the artificial gauge flux and are caused by cyclic transformations of Wannier orbitals.
CHINESE PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Simon C. Davenport, Ivan D. Rodriguez, J. K. Slingerland, Steven H. Simon
Article
Physics, Multidisciplinary
F. J. Burnell, Steven H. Simon, J. K. Slingerland
NEW JOURNAL OF PHYSICS
(2012)
Article
Materials Science, Multidisciplinary
Ivan D. Rodriguez, Simon C. Davenport, Steven H. Simon, J. K. Slingerland
Article
Materials Science, Multidisciplinary
O. Smits, J. K. Slingerland, S. H. Simon
Article
Materials Science, Multidisciplinary
Gunnar Moeller, Layla Hormozi, Joost Slingerland, Steven H. Simon
Article
Materials Science, Multidisciplinary
G. Kells, D. Sen, J. K. Slingerland, S. Vishveshwara
Article
Physics, Multidisciplinary
M. Fremling, Cecile Repellin, Jean-Marie Stephan, N. Moran, J. K. Slingerland, Masudul Haque
NEW JOURNAL OF PHYSICS
(2018)
Article
Physics, Multidisciplinary
D. Pellegrino, G. Kells, N. Moran, J. K. Slingerland
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2020)
Article
Physics, Multidisciplinary
K. Kavanagh, S. Dooley, J. K. Slingerland, G. Kells
Summary: In this study, we investigate the impact of particle pair creation and annihilation on the non-equilibrium steady state and Liouvillian gap of the quantum transverse XY model. By using operator quantization and a Majorana canonical basis, we demonstrate that the character of the gap is dependent on the anisotropy parameter and varies with the phase of the XY model, corresponding to a quantum phase transition.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
A. Conlon, D. Pellegrino, J. K. Slingerland
Summary: Kitaev's toric code is constructed using a finite gauge group, which can be extended with a finite-dimensional semisimple Hopf algebra. By introducing a non-trivial quasitriangular structure, the construction of the gauge theory is modified, resulting in a non-commutative algebra and simple Hamiltonian models that generalize the toric code. In the case of Z(N) gauge theory, the non-trivial R-matrix leads to flux attachment.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Physics, Multidisciplinary
Jorgen Fulsebakke, Mikael Fremling, Niall Moran, J. K. Slingerland
Summary: Calculating pair correlations and density profiles of quasiholes is a routine procedure in studying fractional quantum Hall states, but there is no standardized method for presenting the results in a reproducible form. In this study, a polynomial expansion is developed to allow for quantitative comparison between different wavefunctions and reliable scaling to the thermodynamic limit. This expansion is applied to extract coefficients and profiles for various quantum Hall states, and it is found that the expansion coefficients can be well fitted using a cosine oscillation with exponentially decaying amplitude. The frequency and decay length of the oscillation are related to the filling fraction in an intuitive way.
Article
Materials Science, Multidisciplinary
Nico Kirchner, Darragh Millar, Babatunde M. Ayeni, Adam Smith, Joost K. Slingerland, Frank Pollmann
Summary: Two-dimensional systems like quantum spin liquids or fractional quantum Hall systems exhibit anyonic excitations with more general statistics than bosons or fermions. Simulating these anyonic systems is challenging, even for non-interacting anyons. In this study, we propose an algorithm derived from low energy topological quantum field theory to simulate anyonic tight-binding Hamiltonians on two-dimensional lattices. Using this algorithm, we investigate the energy level spacing statistics for different types of anyons and observe level repulsion for free semions, Fibonacci anyons, and Ising anyons. We also simulate nonequilibrium quench dynamics and find that the density distribution becomes homogeneous over time, indicating thermalization.
Article
Materials Science, Multidisciplinary
M. Fremling, N. Moran, J. K. Slingerland, S. H. Simon
Article
Materials Science, Multidisciplinary
N. Moran, D. Pellegrino, J. K. Slingerland, G. Kells
Article
Materials Science, Multidisciplinary
M. Fremling, J. Fulsebakke, N. Moran, J. K. Slingerland