Article
Physics, Multidisciplinary
Ashley M. Cook, Joel E. Moore
Summary: This article uncovers a new class of multiplicative topological phases using symmetry, which have nontrivial topological properties and can carry current at the edges of the sample. Considerable understanding of these phases has been gained recently by considering additional protecting symmetries, different types of quasiparticles, and systems out of equilibrium. The authors construct a large class of previously unidentified multiplicative topological phases characterized by tensor product Hilbert spaces, and demonstrate their methods by introducing multiplicative topological phases based on Hopf and Chern insulator phases.
COMMUNICATIONS PHYSICS
(2022)
Review
Chemistry, Multidisciplinary
Wei Jiang, Xiaojuan Ni, Feng Liu
Summary: Metal-organic and covalent-organic frameworks have unique structural properties such as high porosity and large surface-to-volume ratio, which have led to extensive research for fundamental interests and promising applications. Recent experimental breakthroughs in synthesizing 2D conjugated MOFs/COFs with high conductivity and robust magnetism have sparked renewed interest in their electronic properties. The diversity and high tunability of MOFs/COFs have provided a platform to explore novel quantum physics and chemistry, leading to the discovery of exotic quantum states.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Article
Physics, Multidisciplinary
Marco Michael Denner, Frank Schindler
Summary: We investigate the response of non-Hermitian topological phases with intrinsic point gap topology to localized magnetic flux insertions. In two dimensions, we identify the necessary and sufficient conditions for a flux skin effect that localizes a large number of in-gap modes at the flux core. In three dimensions, we establish the existence of various phenomena, including a flux spectral jump, higher-order flux skin effect, and a flux Majorana mode, and discuss their association with non-Hermitian symmetry classes and possible experimental realizations.
Article
Materials Science, Multidisciplinary
Ryohei Kobayashi
Summary: In this paper, the authors provide state sum path integral definitions of exotic invertible topological phases proposed by Hsin, Ji, and Jian. These phases have time-reversal symmetry and depend on the choice of the Wu structure. The authors propose a lattice construction for the exotic phase based on the Wu structure, and also generalize the classification of G-SPT phases based on the Wu structure.
Article
Materials Science, Multidisciplinary
Jannis Neuhaus-Steinmetz, Elena Y. Vedmedenko, Thore Posske, Roland Wiesendanger
Summary: Understanding the magnetic properties of atomic chains on superconductors is crucial for controlling and constructing topological electronic matter. Different magnetic ground states, including ferromagnetic, antiferromagnetic, and spin spiral configurations, have been suggested and confirmed experimentally. The study also identifies complex collinear spin configurations and explains them using an effective Heisenberg model with dominant four-spin interactions.
Article
Physics, Multidisciplinary
Alex Hiro Mayo, Hidefumi Takahashi, Mohammad Saeed Bahramy, Atsuro Nomoto, Hideaki Sakai, Shintaro Ishiwata
Summary: This study investigates the magnetic-field-induced switching of band topology in alpha-EuP3. The results show that a giant anomalous Hall effect signal emerges when the magnetic field is applied perpendicular to the monoclinic structure's single mirror plane. On the other hand, applying the magnetic field along the interlayer direction leads to a pronounced negative longitudinal magnetoresistance. The researchers found that these anomalies are manifestations of two distinct topological phases: topological nodal-line and Weyl semimetals.
Article
Optics
Wei Jia, Lin Zhang, Long Zhang, Xiong-Jun Liu
Summary: The theory introduces the concept of high-order topological charges to characterize equilibrium topological phase with nonequilibrium quantum dynamics, predicting novel phenomena. Through a dimension reduction approach, it quantifies a d-dimensional (dD) integer-invariant topological phase with lower dimensional topological number, and demonstrates that the postquench Hamiltonian's bulk topology can be detected through a high-order dynamical bulk-surface correspondence.
Article
Physics, Multidisciplinary
Alex Turzillo, Minyoung You
Summary: This study investigates the boundary supersymmetry of one-dimensional fermionic phases beyond SPT phases, calculating the number of protected boundary supercharges based on bulk phase invariants. Using the connection between Majorana edge modes and real supercharges, the researchers were able to derive this information.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Jinzhu Jiang, Jia-Hui Zhang, Feng Mei, Zhonghua Ji, Ying Hu, Jie Ma, Liantuan Xiao, Suotang Jia
Summary: The recent experimental realization of optical tweezer arrays of ultracold molecules has provided a versatile platform for exploring different molecular phases of matter. By programming tweezers, researchers have been able to tailor dipolar interactions in an optical tweezer ladder to implement a generalized Su-Schrieffer-Heeger model, leading to the discovery of various chiral and interacting topological phases with richer topological edge states. Detection and robustness of these topological phases have also been discussed.
Article
Quantum Science & Technology
Xiang-Long Yu, Wentao Ji, Lin Zhang, Ya Wang, Jiansheng Wu, Xiong-Jun Liu
Summary: This study introduces the concept of high-order band inversion surfaces for characterizing equilibrium topological phases through far-from-equilibrium quantum dynamics and experimental simulation. By investigating the high-order BISs, it is shown that quantum dynamics can exhibit nontrivial topological patterns during quenching processes, corresponding to and characterizing the equilibrium topological phase. The high-order dynamical bulk-surface correspondence provides new and optimal schemes to detect and simulate topological states.
Article
Physics, Multidisciplinary
Ryan Requist, E. K. U. Gross
Summary: The study focuses on factorizing a many-body wave function in Fock space, describing strongly correlated orbitals and weakly correlated parts separately. By using a generalized Kohn-Sham equation with an orbital-dependent functional approximation, the researchers were able to reproduce the topological phase diagram of a multiband Hubbard model. The roles of band filling and interband fluctuations were also elucidated in the study.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Guanyi Gao, Hairui Bao, Bao Zhao, Hao Huan, Zhongqin Yang
Summary: By using density-functional calculations and symmetry analysis, it was found that triply degenerate point (TDP) semimetals and Dirac semimetals exist in hydrogenated SnPb compounds. Additionally, other topological states like type-I, type-II, and Dirac semimetal states were also observed in these compounds, offering an ideal material platform for realizing topological semimetals and insulators in experiments.
Editorial Material
Chemistry, Physical
Faxian Xiu
Summary: Epitaxial topological heterostructures of (Bi,Sb)(2)Te-3/graphene/gallium have been achieved using molecular-beam epitaxy, providing the opportunity to access Majorana zero modes in electrical transport when combined with van der Waals tunnel junctions.
Article
Physics, Applied
Junji Haruyama
Summary: The passage primarily introduces the research and applications of 2D topological insulators and quantum spin Hall phases, focusing on their potential applications in dissipationless spintronic devices, as well as the development of innovative quantum devices in atomically thin layers such as graphene.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Felix Gerken, Thore Posske, Shaul Mukamel, Michael Thorwart
Summary: We develop a microscopic theory to study the two-dimensional spectroscopy of one-dimensional topological superconductors. By considering a ring geometry with periodic boundary conditions, the energy-specific differences caused by topologically protected or trivial boundary modes are bypassed. Numerical and analytical results show that the cross-peak structure in the 2D spectra carries unique signatures of the topological phases of the chain. Our work reveals the potential of 2D spectroscopy in identifying topological phases in bulk properties.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Alberto de la Torre, Kyle L. Seyler, Michael Buchhold, Yuval Baum, Gufeng Zhang, Nicholas J. Laurita, John W. Harter, Liuyan Zhao, Isabelle Phinney, Xiang Chen, Stephen D. Wilson, Gang Cao, Richard D. Averitt, Gil Refael, David Hsieh
Summary: The study investigates the ultrafast non-equilibrium dynamics of the antiferromagnetic Mott insulator Sr2IrO4 using second harmonic optical polarimetry and coherent magnon spectroscopy. The results reveal a far-from-equilibrium critical regime where static and dynamic behavior decouple.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Anirban Mukherjee, Noah F. Berthusen, Joao C. Getelina, Peter P. Orth, Yong-Xin Yao
Summary: Hybrid quantum-classical embedding methods for correlated materials simulations have not been extensively studied, particularly regarding the large quantum resources required for multi-band d and f electron materials. In this study, we compare the performance of different variational quantum eigensolvers in ground state preparation for interacting multi-orbital embedding impurity models, finding that adaptive algorithms and models with 8 spin-orbitals can achieve fidelities better than 99.9%, with an average of 2(14) shots per measurement circuit. Additionally, even with gate noise, parameter optimizations can still be performed if the two-qubit gate error is below 10(-3), slightly lower than current hardware levels. Finally, we measure the ground state energy on IBM and Quantinuum hardware using a converged adaptive ansatz and obtain a relative error of 0.7%.
COMMUNICATIONS PHYSICS
(2023)
Article
Multidisciplinary Sciences
Anyuan Gao, Yu-Fei Liu, Jian-Xiang Qiu, Barun Ghosh, Thais V. Trevisan, Yugo Onishi, Chaowei Hu, Tiema Qian, Hung-Ju Tien, Shao-Wen Chen, Mengqi Huang, Damien Berube, Houchen Li, Christian Tzschaschel, Thao Dinh, Zhe Sun, Sheng-Chin Ho, Shang-Wei Lien, Bahadur Singh, Kenji Watanabe, Takashi Taniguchi, David C. Bell, Hsin Lin, Tay-Rong Chang, Chunhui Rita Du, Arun Bansil, Liang Fu, Ni Ni, Peter P. Orth, Qiong Ma, Su-Yang Xu
Summary: This article reports a quantum metric nonlinear Hall effect induced by interfacing even-layered MnBi2Te4 with black phosphorus. The effect switches direction upon reversing the antiferromagnetic spins and exhibits distinct scaling.
Article
Physics, Multidisciplinary
Eric Mascot, Themba Hodge, Dan Crawford, Jasmin Bedow, Dirk K. Morr, Stephan Rachel
Summary: The article presents a method for calculating arbitrary many-body wave functions and their properties from time evolved single-particle states of a superconductor. This allows for larger system sizes and the tracking of the quality of the braiding process. The study of Majorana dynamics is crucial for quantum computing.
PHYSICAL REVIEW LETTERS
(2023)
Article
Quantum Science & Technology
M. Sohaib Alam, Noah F. Berthusen, Peter P. Orth
Summary: This study investigates the feasibility of using reinforcement learning for single-qubit quantum state preparation and gate compilation. By constructing Markov decision processes, the researchers find optimal paths that correspond to the shortest possible sequence of gates to achieve the desired outcomes. The method works well in both noisy and noise-free environments, and outperforms other quantum compilation methods.
NPJ QUANTUM INFORMATION
(2023)
Article
Materials Science, Multidisciplinary
Ana-Marija Nedic, Victor L. Quito, Yuriy Sizyuk, Peter P. Orth
Summary: We propose stacked two-dimensional lattice designs of frustrated and SO(3)-symmetric spin models that realize emergent Z3 Potts nematic order. Using Monte Carlo simulations and analytical calculations, we investigate the classical AFM-FM windmill model and map out its phase diagrams. We discover a state with composite Potts nematic order and relate it to Potts phases in other spin models.
Article
Materials Science, Multidisciplinary
Jacob Beyer, Jonas B. Hauck, Lennart Klebl, Tilman Schwemmer, Dante M. Kennes, Ronny Thomale, Carsten Honerkamp, Stephan Rachel
Summary: We study the Rashba-Hubbard model on the square lattice, which is a typical case for studying spin-orbit coupling effects in correlated electron systems. Using a truncatedunity variant of the functional renormalization group, we analyze magnetic and superconducting instabilities simultaneously. Phase diagrams are derived based on the strengths of Rasbha spin-orbit coupling, real second-neighbor hopping, and electron filling. Both commensurate and incommensurate magnetic phases are found to compete with d-wave superconductivity. Mixing of d-wave singlet pairing with f-wave triplet pairing is quantified due to the breaking of inversion symmetry.
Article
Materials Science, Multidisciplinary
Farhan Islam, Thais. Trevisan, Thomas Heitmann, Santanu Pakhira, Simon X. M. Riberolles, N. S. Sangeetha, David C. Johnston, Peter P. Orth, David Vaknin
Summary: We present neutron-diffraction results on single-crystal CaMn2P2 with corrugated Mn honeycomb layers, and determine the ground-state magnetic structure. The diffraction patterns consist of (1/6,1/6,L) magnetic Bragg reflections, indicating a first-order antiferromagnetic transition at TN = 70(1) K. Analysis reveals a 6 x 6 magnetic unit cell with spins rotating by 60 degrees steps between nearest neighbors on each sublattice, consistent with the PAc magnetic space group. Several other magnetic subgroup symmetries of the paramagnetic P3m1 crystal symmetry are also consistent with the diffraction pattern. Our findings are relevant to frustrated J1-J2-J3 Heisenberg honeycomb antiferromagnets with single-ion anisotropy and the emergence of Potts nematicity.
Article
Materials Science, Multidisciplinary
Daniel Crawford, Eric Mascot, Makoto Shimizu, Roland Wiesendanger, Dirk K. Morr, Harald O. Jeschke, Stephan Rachel
Summary: Magnet-superconductor hybrid (MSH) systems are a key platform for custom-designed topological superconductors. Recent experiments on a niobium surface have shown that both ferromagnetic (FM) and antiferromagnetic (AFM) chains may be engineered. In general, AFM chains have a larger topological gap compared to FM chains, resulting in shorter coherence lengths and more pronounced localization of Majorana zero-modes (MZMs) in these chains. Adding an adjacent chain can potentially result in a nontrivial system with a single MZM at each chain end.
Article
Materials Science, Multidisciplinary
Mahdi Mashkoori, Fariborz Parhizgar, Stephan Rachel, Annica M. Black-Schaffer
Summary: The robustness of topological quantum states against local perturbations depends on the preservation of system symmetry. Magnetic impurities and defects break time-reversal invariance, making time-reversal invariant topological superconductors vulnerable to this type of disorder. However, nonmagnetic impurities preserve time-reversal symmetry, leading to an expectation of the persistence of time-reversal invariant topological superconductors in the presence of nonmagnetic disorder. This study investigates the effect of nonmagnetic disorder on a time-reversal invariant topological superconductor with extended s-wave pairing, showing that the disorder strongly affects the topological phase by closing the energy gap.
Article
Quantum Science & Technology
Erik J. Gustafson, Andy C. Y. Li, Abid Khan, Joonho Kim, Doga Murat Kurkcuoglu, M. Sohaib Alam, Peter P. Orth, Armin Rahmani, Thomas Iadecola
Summary: Quantum many-body scar states, which exhibit atypical entanglement and correlation properties, can be studied using state preparation protocols on quantum computers. Experimental demonstrations on superconducting quantum hardware have been provided.
Article
Physics, Multidisciplinary
Klee Pollock, Peter P. Orth, Thomas Iadecola
Summary: We propose a variational quantum algorithm to estimate microcanonical expectation values in models obeying the eigenstate thermalization hypothesis. The algorithm generates weakly entangled superpositions of eigenstates at a given target energy density by using a relaxed criterion for convergence. These variational states are then used to estimate microcanonical averages of local operators.
PHYSICAL REVIEW RESEARCH
(2023)
Proceedings Paper
Computer Science, Software Engineering
Benjamin McDonough, Andrea Mari, Nathan Shammah, Nathaniel T. Stemen, Misty Wahl, William J. Zeng, Peter P. Orth
Summary: Current quantum computers suffer from noise issues, which affect the accuracy of results. To mitigate the bias caused by noise, probabilistic error cancellation (PEC) and probabilistic error reduction (PER) methods can be used. PER reduces the sampling overhead but reintroduces bias. To facilitate the widespread use of PER, we have developed an automated quantum error mitigation software framework.
2022 IEEE/ACM THIRD INTERNATIONAL WORKSHOP ON QUANTUM COMPUTING SOFTWARE (QCS)
(2022)
Article
Optics
Mathieu Barbier, Henrik Luetjeharms, Walter Hofstetter
Summary: Using trapped Rydberg-excited p states in an optical lattice, the ground-state phase diagram and different regimes of an extended two-component Bose-Hubbard model are studied. The anisotropic interaction is found to be more advantageous for observing supersolid phases compared to the isotropic case.
Article
Materials Science, Multidisciplinary
Kai Klocke, Michael Buchhold
Summary: The study investigates the dynamics of a quantum error correcting code under Pauli measurements, revealing the breaking of topological and symmetry-breaking orders, leading to a rich phase diagram and non-integer multiples of the correlation length exponent. Additionally, a robust transient scaling regime for purification dynamics is identified, demonstrating a modified dynamical critical exponent observable up to times similar to L-z*.
