NPJ QUANTUM MATERIALS

Peng Dong, Jinghui Wang, Yanjiang Wang, Jianjun Xiao et al.

Abstract not available. Bibliographic information is searchable.

Zhennan Wang, Feilong Song, Haonan Chang, Jun Zhang

Abstract not available. Bibliographic information is searchable.

Amanda A. Konieczna, Marius Möller, P. Peter Stavropoulos, Roser Valentí

Abstract Recent experimental studies of the spin-1 honeycomb antiferromagnet Na ₃ Ni ₂ BiO ₆ have revealed a pronounced one-third magnetization plateau under applied magnetic fields, highlighting the presence of strong magnetic frustration and anisotropy in this material. Such behavior has been attributed to substantial bond-dependent Kitaev interactions in combination…

Praveen Sriram, Connie L. Hsueh, Karna A. Morey, Tiantian Wang et al.

Abstract Arrays of hybrid metal-semiconductor quantum dots offer a new approach to quantum simulation, with key advantages over arrays of conventional quantum dots. Because the metallic component of these hybrid dots has a quasi-continuous level spectrum, each site in an array can be effectively electronically identical; in contrast, each conventional semiconductor quantum dot …

E. Sadrollahi, J. Almeida Mendes, N. Stilkerich, A. K. Sharma et al.

Abstract The kagome metals A V ₃ Sb ₅ (A = K, Rb, Cs) provide a unique platform to investigate the physics of interacting electrons, a central challenge in condensed matter physics. A key obstacle in unraveling their correlated behavior is to determine which structural and electronic degrees of freedom are involved and how they couple. Here, we address this important issu…

Chuan Chen, Inti Sodemann Villadiego

Abstract We investigate the dispersions of anyon quasiparticles in the Kitaev honeycomb spin liquid perturbed by Γ and $${\Gamma }^{{\prime} }$$ couplings in order to understand phase transitions into competing states through anyon gap-closing instabilities. We demonstrate how anyon gap closings provide a way to understand phase transitions into a plethora of previously identif…

Yong Zhang, Yonglong Xue, Sutao Sun, Hao Ren et al.

Topological nodal-loop semimetals represent an important class of quantum materials and have attracted intense research interest due to their exotic topological states and transport phenomena. Hafnium phosphide (HfP 2 ) is a recently discovered nodal-loop semimetal and its transport properties have not been reported yet. Here, we grew HfP 2 single crystals by the chemical vapor…

Jin-Xin Hu, Mengli Hu, Ying-Ming Xie, K. T. Law

We propose that unconventional Josephson effects can typically emerge in PT -symmetric antiferromagnetic (AFM) bilayer systems. When proximitized by a conventional superconductor, these heterostructures host dominant interlayer pairing correlation that features a distinctive spin texture enabled by the strong exchange field. Specifically, we demonstrate a novel mechanism for el…

J. Khatua, Taeyun Kim, Chanhyeon Lee, U. Jena et al.

Spin-1 kagome lattice antiferromagnets provide a versatile platform for exploring exotic quantum states, such as classical spin liquids and spin nematics, owing to the confluence of geometric frustration, bilinear and biquadratic interactions, and single-ion anisotropy. Here, we investigate the ground state and spin dynamics of a nearly perfect s = 1 kagome lattice, \({({\text{…

Shihao Zhang

Abstract Altermagnetism is characterized by non-relativistic spin splitting and zero total magnetic moments. Herein, we identify intrinsic antiferromagnetic half-metallic phases and topological phases emerging from the ferrovalley states of sliding bilayer altermagnets. Taking the V ₂ OSSe system for example, first-principles calculations indicate that the spin-dependent int…

Eduard Koller, Swetlana Swarup, Johannes Knolle, Natalia B. Perkins

Recent Raman experiments on the Kitaev material α -RuCl 3 have reported a finite Raman circular dichroism (RCD), revealing chiral phonon behavior not expected from lattice symmetry alone. To explain this observation, we develop a diagrammatic framework for the spin–phonon-coupled Kitaev model. We demonstrate that bare phonons contribute no RCD, but coupling to the chiral spin e…

Kinga Jasiewicz, Paweł Wójcik, Michał P. Nowak, Michał Zegrodnik

We study the interplay between altermagnetism and unconventional superconductivity for two-dimensional square- and triangular-lattice systems. Our approach is based on an effective single particle Hamiltonian which mimics the alternating spin splitting of the d - wave and i - wave altermagnetic state. By supplementing the model with intersite pairing term we characterize the pr…

V. Sunko, J. Orenstein

Altermagnets are a class of magnets that exhibit non-relativistic spin splitting (NRSS) of electronic bands in the absence of net magnetization. Their potential to generate large spin polarization without spin-orbit coupling has created strong interest in probes that access the underlying order parameter directly. In this Perspective, we show that linear magneto-birefringence (…

Yang Liu, Tongrui Li, Xixi Yuan, Nour Maraytta et al.

The rational design of new materials emerges as an important direction to explore new topological materials, which is based on the understanding of the correlation between crystal and electronic structures. In this paper, we perform a comprehensive study on the crystal and electronic structures in LaAgAs2 through a combination of single-crystal x-ray diffraction (XRD), quantum …

Grant Z. X. Yang, Zi-Ting Sun, Ying-Ming Xie, K. T. Law

Planar Josephson junctions are pivotal for engineering topological superconductivity, yet are severely hindered by the orbital effects induced by in-plane magnetic fields, or the stray fields introduced by the use of ferromagnets. Here, we propose the generic topological altermagnetic Josephson junctions (TAJJs) as a solution to this critical problem. By leveraging the anisotro…

Ilyoung Lee, Wontae Lee, Jaejun Yu

Recent studies have identified HfO2 as a promising ferroelectric material for thin films, highlighting its potential as a state-of-the-art option for future ferroelectric applications. However, due to the complexity of the fabrication process, the underlying mechanism of the phase transition to Pca21 is still not fully understood. In this study, we aim to clarify the phase tran…

Kazuhiro Nawa, Yoshinori Imai, Maiko Kofu, Richard Mole et al.

Abstract The Kitaev model, which consists of bond-dependent Ising interactions on the honeycomb plane, is known as a promising model for realising a spin liquid in the exact ground state. Since bond-dependent Ising interactions are induced by orbital exchange processes via ligand ions, it is important to reveal the effect of ligand ions on the formation of bond-dependent Ising …

F. Schilberth, M. Kondákor, D. Ukolov, A. Pawbake et al.

Abstract Lattice vibrations are highly sensitive to crystal symmetries and their changes across phase transitions. The latter can modify irreducible (co)representations and corresponding infrared and Raman selection rules of phonons. This concept is established for relativistic magnetic point groups, simultaneously transforming spatial and spin coordinates. However, in altermag…

Jonathan Gaudet, Dalmau Reig-i-Plessis, Bogeng Wen, Thomas J. Hicken et al.

We investigate the magnetic ground state of CuNdO2, which is a delafossite with a triangular lattice of magnetic Nd3+ ions that are well separated by non-magnetic Cu spacer layers. From inelastic neutron scattering measurements of the crystal electric field, we determine the strong Ising character of the pseudo-spin 1/2 Nd3+ moments. Magnetic susceptibility and heat capacity me…

Wenfeng Wu, Eric Jacob, Viktor Christiansson, Ying Gao et al.

Abstract Recent experimental discoveries of infinite- and finite-layer nickelate superconductors have highlighted the importance of a single-band $${d}_{{x}²-{y}²}$$ Fermi surface for enabling unconventional superconductivity similar to cuprates. Motivated by this, we use density functional theory (DFT) and dynamical mean-field theory (DMFT) to identify two infinite-layer…