New Journal of Physics最新文献

{"title":"Nonreciprocal microcombs via spinning optomechanics","authors":"Zeng‐Xing Liu, Dan Wei, Jing-Hua Sun","doi":"10.1088/1367-2630/ae31aa","DOIUrl":"https://doi.org/10.1088/1367-2630/ae31aa","url":null,"abstract":"Abstract On-chip optical frequency combs (microcombs) are critical for advanced photonic technologies. However, achieving broad bandwidth and nonreciprocal control in a single microcomb device remains a formidable challenge. Here, we demonstrate the generation of a robust microcomb (a bandwidth exceeding 1.9 GHz with up to 20 comb lines) by harnessing rotation-enhanced optomechanical interactions in a spinning microresonator. We show that the Sagnac–Fizeau drag effect significantly amplifies mechanical oscillations and the intracavity photon number, enabling a robust microcomb spectrum with a frequency comb spacing in the MHz range. Crucially, the direction of the pump laser dictates comb generation: it is efficiently activated for one propagation direction but suppressed for the reverse. This nonreciprocity, controlled solely by rotation speed and input direction, provides a new paradigm for manipulating microcombs on a chip. Our work establishes rotational optomechanics as a powerful platform for creating nonreciprocal integrated photonic devices, with implications for precision metrology, optical communications, and topological photonics.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"28 1","pages":"014516-014516"},"PeriodicalIF":0.0,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://iopscience.iop.org/article/10.1088/1367-2630/ae31aa/pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147902374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantum synchronizing words","authors":"Andrzej Grudka, Marcin Karczewski, Paweł Kurzyński, Jȩdrzej Stempin, Jan Wójcik, Antoni Wójcik","doi":"10.1088/1367-2630/ae16ca","DOIUrl":"https://doi.org/10.1088/1367-2630/ae16ca","url":null,"abstract":"Abstract Synchronizing words in classical automata theory provide a mechanism to reset any state of a deterministic automaton to a specific target state via a carefully chosen finite sequence of transition rules. In this work, we extend the concept of synchronizing words to quantum information theory. Specifically, we investigate whether the concatenation of two non-resetting quantum channels can give rise to a resetting channel. While we formulate the problem for general qudits, the complexity of the setting leads us to focus on particular resetting concatenations for qubits and qutrits. Furthermore, we demonstrate that following the reset, any pure real qutrit state can be closely approximated using the same two non-resetting channels. These findings establish a quantum analogue of synchronizing words, highlighting their potential applications in constructing minimal sets of quantum channels capable of both resetting and preparing arbitrary states.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"27 11","pages":"114504-114504"},"PeriodicalIF":0.0,"publicationDate":"2025-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147895097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced extracellular matrix remodeling due to embedded spheroid fluidization.","authors":"Tao Zhang, Shabeeb Ameen, Sounok Ghosh, Kyungeun Kim, Mrinal Pandey, Brian C H Cheung, Minh Thanh, Alison E Patteson, Mingming Wu, J M Schwarz","doi":"10.1088/1367-2630/ade81e","DOIUrl":"10.1088/1367-2630/ade81e","url":null,"abstract":"<p><p>Embedding a collective of tumor cells, i.e. a tumor spheroid, in a fibrous environment, such as a collagen network, provides an essential <i>in vitro</i> platform to investigate the biophysical mechanisms of tumor invasion. To predict new mechanisms, we develop a three-dimensional computational model of an embedded spheroid using a vertex model, with cells represented as deformable polyhedrons, mechanically coupled to a fiber network via active linker springs. As the linker springs actively contract, the fiber network remodels. As we tune the rheology of the spheroid and the fiber network stiffness, we find that both factors affect the remodeling of the fiber network with fluid-like spheroids densifying and radially realigning the fiber network more on average than solid-like spheroids but only for a range of intermediate fiber network stiffnesses. Our predictions are supported by experimental studies comparing non-tumorigenic MCF10A spheroids and malignant MDA-MB-231 spheroids embedded in collagen networks. The spheroid rheology-dependent effects are the result of cellular motility generating spheroid shape fluctuations. These shape fluctuations lead to emergent feedback between the spheroid and the fiber network to further remodel the fiber network. This emergent feedback occurs only at intermediate fiber network stiffness since at low fiber network stiffness, the mechanical response of the coupled system is dominated by the spheroid and for high fiber network stiffness, the mechanical response is dominated by the fiber network. We are therefore able to quantify the regime of optimal spheroid-fiber network mechanical reciprocity. Our results uncover intricate morphological-mechanical interplay between an embedded spheroid and its surrounding fiber network with both spheroid contractile strength <i>and</i> spheroid shape fluctuations playing important roles in the pre-invasion stages of tumor invasion.</p>","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"27 7","pages":"073301"},"PeriodicalIF":2.8,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12242829/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144626780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single-atom amplification assisted by multiple sideband interference in waveguide QED systems","authors":"Kuan-Ting Lin, Ting Hsu, Fahad Aziz, Yu‐Chen Lin, P. Y. Wen, I.-C. Hoi, Guin-Dar Lin","doi":"10.1088/1367-2630/add7fe","DOIUrl":"https://doi.org/10.1088/1367-2630/add7fe","url":null,"abstract":"Abstract This study conducts a theoretical investigation into the signal amplification arising from multiple Rabi sideband coherence within a waveguide quantum electrodynamics system. We utilize a semi-infinite waveguide to drive an anharmonic multi-level transmon with a strong coherent microwave field, examining the scattering behaviour by introducing a probe signal. Our findings show signal amplification under specific resonant conditions, presenting spectra that reveal finer details than previously documented in the literature. To elucidate the mechanisms behind this amplification, we develop a model that explicitly accounts for multiple dressed sidebands in the presence of a strong driving field. From this model, we derive the reflection amplitude of the probe signal. Notably, our results indicate that amplification can occur due to either population inversion or, in some instances, through the constructive interference of multiple sidebands even in the absence of population inversion. Additionally, we explore how qubit dephasing impacts the amplification process.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"27 6","pages":"064108-064108"},"PeriodicalIF":0.0,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147899175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Migration of ferrous ions (Fe²⁺) during the synthesis of (Li,Fe)OHFeSe by ion exchange technology","authors":"Guangyu Hu, Mengzhu Shi, Z.H. Zhang, Xiu-juan Chu, Wenwen Liu, Jingfeng Guo, Min Gao, T. F. Duan, X. G. Luo","doi":"10.1088/1367-2630/add7ff","DOIUrl":"https://doi.org/10.1088/1367-2630/add7ff","url":null,"abstract":"Abstract Iron-based superconductors (FeSCs), particularly the air-stable (Li,Fe)OHFeSe, have drawn considerable attention due to their complex crystalline structures and intriguing superconducting properties. This study focuses on the synthesis of (Li,Fe)OHFeSe, using hydrothermal ion exchange technology with a nearly vacancy-free (PY) x FeSe precursor. We successfully synthesized samples in both iron-poor and iron-rich reaction systems, with the iron-rich samples exhibiting superconductivity at a transition temperature ( T c ) of 40 K, while iron-poor samples did not. Inductively coupled plasma atomic emission spectroscopy (ICP-AES) results showed an obvious difference in Se content between the original solutions of iron-poor and iron-rich systems after the hydrothermal reaction. We propose that in iron-rich system, Fe 2+ ions migration into the (Li,Fe)OH layer from the reaction solution directly maintains the stability of the FeSe layer in the precursor, facilitating superconductivity. Conversely, in iron-poor system, Fe 2+ ions migrate into the (Li,Fe)OH layer partly from the reaction solution and partly from the FeSe layer, creating Fe vacancies in the FeSe layer, which inhibit the occurrence of superconductivity. Our findings provide valuable insights into the synthesis of intercalated FeSe-based superconducting materials and the realization of superconductivity in FeSe based superconducting materials.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"27 5","pages":"053502-053502"},"PeriodicalIF":0.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147333835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Manipulation of room-temperature magnetic skyrmions in a van der Waals ferromagnet Fe₃GaTe₂","authors":"Yanlong Yin, M. Liu, Wei Li, Li Wan, Mengting Zou, Si Wu, Weixing Xia, Baomin Wang","doi":"10.1088/1367-2630/adad0d","DOIUrl":"https://doi.org/10.1088/1367-2630/adad0d","url":null,"abstract":"Abstract The magnetic skyrmion in two-dimensional van der Waals (vdW) ferromagnetic materials offer a feasible and robust platform for future spintronic applications, thanks to their atomic-scale interface and stacking structure. Recently, a room temperature vdW ferromagnet Fe 3 GaTe 2 (FGT) has been discovered, in which skyrmion lattice can be generated. In this work, we studied the evolution of stripe domains in FGT nanoflake at different temperatures and magnetic fields, confirming the Néel-type skyrmion through Lorentz transmission electron microscopy. We systematically explored the dependence of the size, density and stability of skyrmion on the thickness, temperature and magnetic field of the FGT nanoflake. This work provides a variety of experimental evidence to shed light on the potential application of two-dimensional vdW FGT for future spintronic devices.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"27 1","pages":"013023-013023"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147907947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Higher-order topological phase with subsystem symmetries","authors":"Yizhi You","doi":"10.1088/1367-2630/ad78f9","DOIUrl":"https://doi.org/10.1088/1367-2630/ad78f9","url":null,"abstract":"A wide variety of higher-order symmetry-protected topological phases (HOSPT) with gapless corners or hinges have been proposed as descendants of topological crystalline insulators protected by spatial symmetry. In this work, we address a new class of higher-order topological states that do not require crystalline symmetries but instead rely on subsystem symmetry for protection. We propose several strongly interacting models with gapless hinges or corners based on a decorated hinge-wall condensate picture. The hinge-wall, which appears as the defect configuration of a Z2 paramagnet, is decorated with a lower-dimensional SPT state. Such a unique hinge-wall decoration structure leads to gapped surfaces separated by gapless hinges. The non-trivial nature of the hinge modes can be captured by a D conformal field theory with a Wess–Zumino–Witten term. Moreover, we establish a no-go theorem to demonstrate the ungappable nature of the hinges by making a connection between the generalized Lieb–Schultz–Mattis theorem and the boundary anomaly of the HOSPT state. This universal correspondence engenders a comprehensive criterion to determine the existence of HOSPT under certain symmetries, regardless of the microscopic Hamiltonian.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"1 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Engineering quasi-bound states in the continuum in asymmetric waveguide gratings","authors":"Torgom Yezekyan, Sergejs Boroviks, Olivier J F Martin and Sergey I Bozhevolnyi","doi":"10.1088/1367-2630/ad787d","DOIUrl":"https://doi.org/10.1088/1367-2630/ad787d","url":null,"abstract":"The occurrence of quasi-bound states in the continuum (qBIC) in all-dielectric asymmetric grating waveguide couplers with different degrees of asymmetry under normal light incidence is analysed from the viewpoint of identifying the most promising configuration for realizing the highest quality (Q) factor under the condition of utmost efficiency (i.e. total extinction). Considering asymmetric gratings produced by altering every Nth ridge of a conventional (symmetric) grating coupler, we analyse different regimes corresponding to the interplay between diffractive coupling to waveguide modes and band gap effects caused by the Bragg reflection of waveguide modes. The symmetric and double- and triple-period asymmetric grating couplers are considered in detail for the same unperturbed two-mode waveguide and the grating coupler parameters that ensure the occurrence of total transmission extinction at the same wavelengths. It is found that the highest Q is expected for the double-period asymmetric grating, a feature that we explain by the circumstance that the first-order distributed Bragg resonator (DBR) is realized for this configuration while, for other configurations, the second-order DBR comes into play. Experiments conducted at telecom wavelengths for all three cases using thin-film Al2O3-on-MgF2 waveguides and Ge diffraction gratings exhibit the transmission spectra in qualitative agreement with numerical simulations. Since the occurrence of considered qBIC can be analytically predicted, the results obtained may serve as reliable guidelines for intelligent engineering of asymmetric grating waveguide couplers enabling highly resonant, linear and nonlinear, electromagnetic interactions.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"214 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coherent electron phase-space manipulation by combined elastic and inelastic light-electron scattering","authors":"S T Kempers, I J M van Elk, K A H van Leeuwen and O J Luiten","doi":"10.1088/1367-2630/ad7631","DOIUrl":"https://doi.org/10.1088/1367-2630/ad7631","url":null,"abstract":"Photon-Induced Near-field Electron Microscopy (PINEM), Kapitza–Dirac (KD) gratings, and ponderomotive phase plates are examples of techniques in which the wave function of an electron in free space is manipulated using light fields: free electron quantum optics (FEQO). These effects are usually treated in separate theoretical frameworks. In this paper we present a unified, two-pronged framework that can be used to describe and numerically evaluate the performance of a number of FEQO-based electron-optical elements. The first part is a combination of existing analytical treatments of light-electron scattering, based on solving a relativistically corrected Schrödinger equation. The theoretical overview covers both second-order contributions to PINEM and the Kapitza–Dirac effect. The second, novel element of the approach is based on electron wavefront reconstruction by evaluating the quantum mechanical phase along a bundle of classical electron trajectories. The quasi-classical (but fully relativistic) approach lends itself to simulating a wide variety of FEQO devices, including the examples mentioned. We apply both approaches to a few specific experimental configurations: mirror-based first-order PINEM, second-order PINEM in very high laser intensity, and Kapitza–Dirac diffraction. The results show excellent agreement between the analytical results and the quasi-classical simulations. Finally, we propose a setup that combines KD and PINEM to allow for simultaneous coherent energy and transverse momentum shaping of an electron beam, and present simulation results thereof.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"114 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bipartite OTOC in open quantum systems: information scrambling and irreversibility","authors":"Baibhab Bose, Devvrat Tiwari and Subhashish Banerjee","doi":"10.1088/1367-2630/ad77ee","DOIUrl":"https://doi.org/10.1088/1367-2630/ad77ee","url":null,"abstract":"The field of information scrambling has seen significant growth over the last decade, where the out-of-time-ordered correlator (OTOC) has emerged as a prominent tool to probe it. In this work, we use bipartite OTOC, a particular form of OTOC, to study information scrambling in the atom–field interaction models and the model of the Ising spin chain interacting with a tilted magnetic field. This is done considering the effects of open quantum systems. A relationship between information scrambling, using bipartite OTOC, and irreversibility, using entropy production, is probed under unitary dynamics. The equivalence of bipartite OTOC with operator entanglement is explicitly shown for the Ising model.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"39 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}