Articles in 2023

Magnetic metamaterials are excellent candidates for in-materia reservoir computing (RC), though typical implementations are under a single reservoir architecture. The authors exploit the dynamic properties of interconnected magnetic nanorings to realize reconfigurable reservoir architectures to perform a diverse set of tasks with the same device.

Finding a way to combine quantum mechanics and gravity is a longstanding issue in physics. While there are different approaches to quantum gravity, there are many challenges in making concrete predictions for scenarios at the interface of these two theories. Here, the authors propose a first-principles strategy to determine the dynamics of objects in the presence of mass configurations in superposition, which enables predictions where the gravitational source is in a quantum superposition rather than a classical configuration.

Majorana quasiparticles exhibit exotic non-Abelian statistics, that is crucial for the realization of topological quantum bits. The authors demonstrate theoretically that Majoranas can be hosted at a grain-boundary lattice defect immersed in a parent topological superconductor and externally controlled by a magnetic field, which opens a route to defect-based platforms in quantum information technology.

The authors demonstrate Förster resonant energy transfer (FRET) behavior with assistance of engineered metamaterial surface plasmons. Deep subwavelength microwave regime was explored by the comparison with the perfect electric conductor case, showing the strong influence of the excitation of surface waves on both local density of optical states and FRET.

The authors propose and experimentally demonstrate a magnonic version of a coherent Ising machine that implements a thin film Yttrium Iron Garnet spin-wave delay-line combined with microwave components. The work emphasizes the relative advantages that a slower more compact spin-wave system has over optical machines using similar principles.

Efficient high harmonic generation (HHG) in solids is instrumental for devising applications in XUV spectroscopy, attosecond science and coherent diffraction imaging. Through a systematic experimental comparison, the authors individuate CdTe as the ideal candidate for generating high harmonics with ultra-low pump intensity and high photon flux.

Controlling non-equilibrium systems generally incurs a thermodynamic cost. This paper introduces a trade-off relation between the precision at which one can control a system and the entropy production.

The authors present an approach for detecting ultralight bosonic dark matter using collider and beam dump experiments. The method relies on the time-varying mass of dark sector mediators, which serve as a portal between the dark and Standard Model sector. CMS Open Data are used to demonstrate that this method enhances sensitivity by around one order of magnitude compared to the double-peak method.

In heavy fermion metals, exotic states such as superconductivity depend to a large extent on whether unpaired electrons can become delocalized from the magnetic sites. The authors demonstrate that the primary driving force behind delocalization is the local environment of the rare earth ions and the strength of the resulting charge fluctuations.

Aharonov-Bohm ring is an intuitive single-particle model applied across many fields of physics, but at the cost of neglecting the many-body interactions between particles and with the environment. Motivated by recent cold-atom experiments on Bose polarons, the authors study a particle contained in Aharonov-Bohm ring and weakly interacting Bose gas.

Topological insulators (TIs), as a powerful reservoir of spin-orbit coupling, became popular to replace the heavy metals in bilayers to achieve magnetization switching with high efficiencies and low threshold current densities. By magnetically doping a single layer TI, the authors observe a zero-field magnetization of the TI that can be switched by dc current.

Pattern formation and self-organization are relevant to many types of systems such as low-pressure magnetized plasmas. Here, based on theoretical and computational investigations, the authors show that such a phenomenon can be explained through Turing’s activator-inhibitor model.

The existence of linear-chain configurations in light nuclei has been predicted for decades, but the finding of the exact location on the nuclear chart where this exotic structure emerges has proven to be challenging experimentally. Here, the authors performed an inelastic excitation and cluster-decay experiment followed by unambiguous spin-parity analyses and provide evidence for the emergence of the nuclear chain structure starting from ¹⁴C.

The paper presents an approach for solving optimization problems with multiple arbitrary constraints on quantum computers by combining quantum Zeno dynamics with common quantum optimization algorithms like QAOA. The number of Zeno measurements required is shown to be independent of the problem size in QAOA.

Magnetic skyrmions are topological spin textures that have potential implications for spintronic devices but greater control over their stability and physical characteristics are first required. Here, the authors study the formation of skyrmions in ferrimagnetic thin films of DyCo₃ and using a combination of X-ray measurements determine them to be of the Néel type.

The quantum Hall effect has had a profound impact on solid-state physics and has been investigated using different two-dimensional systems, including graphene. Here, the authors investigate graphene encapsulated by a ferroelectric insulator, CuInP₂S₆, where they observe a quantum Hall effect that endures over a wide temperature range in relatively modest magnetic fields.

Reservoir computing is a hardware-friendly approach for recurrent neural networks, as reservoir weights are fixed and need not be tunable. Here, the authors propose a passive reservoir computing scheme based on frustrated nanomagnets and demonstrate its expressivity and extreme efficiency.

Magnetic impurities can induce a range of exotic phenomena, including the famous Kondo effect in metallic systems and bound states in superconductors. Here, using scanning tunneling microscopy, the authors investigate magnetic impurities on a superconducting vanadium tip and analyse the scaling between the Yu-Shiba-Rusinov state energy and the Kondo temperature.

Artificial spin-ice materials are frustrated arrays of single-domain nanomagnetic islands, which have largely been studied in two-dimensions. In this study, three-dimensional artificial spin-ice systems are considered and are shown via Monte-Carlo simulations and experimental imaging to be home to a range of magnetic charge-ordered states.

Nonlinear interactions between modes with eigenfrequencies that differ by orders of magnitude occur in several physical systems. This article provides a simple conceptual model of these interactions, and uses this model to design tunable frequency combs.