Topological matter articles within Nature Physics

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  • Article |

    Controlling orbital magnetic moments for applications can be difficult. Now local probes of a kagome material, TbV6Sn6, demonstrate how the spin Berry curvature can produce a large orbital Zeeman effect that can be tuned with a magnetic field.

    • Hong Li
    • , Siyu Cheng
    •  & Ilija Zeljkovic

  • Perspective |

    Although topological photonics has been an active field of research for some time, most studies still focus on the linear optical regime. This Perspective summarizes recent investigations into the nonlinear properties of discrete topological photonic systems.

    • Alexander Szameit
    •  & Mikael C. Rechtsman

  • Article |

    Topologically protected hinge modes could be important for developing quantum devices, but electronic transport through those states has not been demonstrated. Now quantum transport has been shown in gapless topological hinge states.

    • Md Shafayat Hossain
    • , Qi Zhang
    •  & M. Zahid Hasan

  • Article
    | Open Access

    The electronic transport properties of charge-ordered kagome metals are controversial. Now careful measurements on unperturbed samples show that previously measured anisotropy in the transport occurs only when external perturbations are present.

    • Chunyu Guo
    • , Glenn Wagner
    •  & Philip J. W. Moll

  • Article |

    Observations of strong electron correlation effects have been mostly confined to compounds containing f orbital electrons. Now, the study of the 3d pyrochlore metal CuV2S4 reveals that similar effects can be induced by flat-band engineering.

    • Jianwei Huang
    • , Lei Chen
    •  & Ming Yi

  • Article
    | Open Access

    Non-Hermitian systems can be described in terms of gain and loss with a coupled environment—a hard feature to tune in quantum devices. Now an experiment shows non-Hermitian topology in a quantum Hall ring without relying on gain and loss.

    • Kyrylo Ochkan
    • , Raghav Chaturvedi
    •  & Ion Cosma Fulga

  • Research Briefing |

    In its superconducting state, MoTe2 displays oscillations arising from an edge supercurrent, and when it is near niobium, there is an incompatibility between electron pairs diffusing from niobium and the pairs intrinsic to MoTe2. Insight into this competition between pairs is obtained by monitoring the noise spectrum of the MoTe2 supercurrent oscillations.

  • Article |

    The Haldane model is a paradigmatic example of topological behaviour but has not previously been implemented in condensed-matter experiments. Now a moiré bilayer is shown to realize this model with the accompanying quantized transport response.

    • Wenjin Zhao
    • , Kaifei Kang
    •  & Kin Fai Mak

  • News & Views |

    A nonlinear optical approach has now enabled picosecond control of a complex band structure, driving a non-Hermitian topological phase transition across an exceptional-point singularity.

    • Jiangbin Gong
    •  & Ching Hua Lee

  • News & Views |

    Understanding lattice-geometry-driven electronic structure and orbital character in a titanium-based superconducting kagome metal provides insights into the non-trivial topology and electronic nematicity of correlated quantum matter.

    • Bahadur Singh

  • News & Views |

    Exploring the combined effects of many-body interactions and topology is experimentally challenging. Now, researchers have shown that strong interparticle interactions force ultracold atoms to shift as a whole or one by one, or break quantization in a topological pump.

    • Yongguan Ke
    •  & Chaohong Lee

  • Article
    | Open Access

    Thouless pumping is the quantization of charge transport through the adiabatic variation of a system’s parameters. The robustness and breakdown of pumping under variations in interparticle interactions have now been shown with ultracold atoms in an optical lattice.

    • Anne-Sophie Walter
    • , Zijie Zhu
    •  & Tilman Esslinger

  • Article |

    Skyrmions are localized magnetic textures that form lattices in some magnetic materials. Neutron spin-echo measurements have now been able to observe topological effects on the low-energy collective excitations of a skrymion lattice.

    • Minoru Soda
    • , Edward M. Forgan
    •  & Hazuki Kawano-Furukawa

  • News & Views |

    Imposing PT-symmetry and pseudo-Hermitian symmetry on an electric circuit with non-reciprocal couplings results in a complex morphology of degenerate eigenvalues that might yield new possibilities in sensing and dynamical engineering.

    • Savannah Garmon

  • Article
    | Open Access

    Some topological boundary states are symmetry protected. Experiments with photonic lattices now show that the protection via sub-symmetry is enough to ensure topological modes, even if the full symmetry and topological invariant are destroyed.

    • Ziteng Wang
    • , Xiangdong Wang
    •  & Hrvoje Buljan

  • News & Views |

    The combination of magnetic and non-magnetic layers in (MnBi2Te4)(Bi2Te3) is predicted to produce topologically protected states on the surface. Experiments now show that the nature of the topmost layer controls the location of these states.

    • Matthew Brahlek
    •  & Robert G. Moore

  • Article |

    Layering quantum materials can produce interesting phenomena by combining the different behaviour of electronic states in each layer. A layer-sensitive measurement technique provides insights into the physics of a magnetic topological insulator.

    • Woojoo Lee
    • , Sebastian Fernandez-Mulligan
    •  & Shuolong Yang

  • Article |

    The observation of band structure features typical of the kagome lattice in FeGe suggests that an interplay of magnetism and electronic correlations determines the physics of this material.

    • Xiaokun Teng
    • , Ji Seop Oh
    •  & Ming Yi

  • News & Views |

    Local magnetometry measurements on a magnetic Chern insulator suggest that the Berry curvature of the topological band — responsible for the intrinsic magnetism — also enables ultra-low current switching of the magnetization.

    • Yonglong Xie

  • Article |

    Switching of magnetic behaviour is one of the main ideas that drives spintronics. Now, magnetic switching via spin-orbit torque is shown in a moiré bilayer, introducing a platform for spintronic applications.

    • C. L. Tschirhart
    • , Evgeny Redekop
    •  & A. F. Young

  • Article |

    Strong correlations between electrons in topological surface states drive the formation of surface van Hove singularities. These may be linked to charge density waves in the surface states.

    • Daniel S. Sanchez
    • , Tyler A. Cochran
    •  & M. Zahid Hasan

  • Article |

    In two-dimensional systems, swapping the position of two indistinguishable particles twice—braiding them—reveals their exchange statistics. Now, a Mach–Zehnder interferometer accomplishes this for anyonic fractional quantum Hall states.

    • Hemanta Kumar Kundu
    • , Sourav Biswas
    •  & Moty Heiblum

  • News & Views |

    Measurements of charge pumping in a quantum anomalous Hall device demonstrate that quantized Hall conductance does not require an edge to transport current, paving the way for the realization of other exotic electronic behaviour.

    • Christopher Eckberg

  • Research Briefing |

    Measurements of the switching supercurrent statistics of a superconducting quantum interference device based on bismuth, a second-order topological insulator, reveal that excited Andreev states are surprisingly long-lived. This protection can be attributed to the splitting of the Andreev pairs carrying the supercurrent along separate crystal hinges of opposite helicities.

  • News & Views |

    Liquid crystal defect structures with topology similar to a Möbius strip can rotate, translate and transform into one another under an applied electric field.

    • Lisa Tran

  • Article |

    Interactions between photons arise due to the presence of optical nonlinearities. In topological Thouless pumps, a sufficiently strong nonlinearity leads to soliton transport with a fractionally quantized plateau structure—reminiscent of transport in the fractional quantum Hall effect.

    • Marius Jürgensen
    • , Sebabrata Mukherjee
    •  & Mikael C. Rechtsman

  • Article
    | Open Access

    Topological defect structures that swim have been realized in liquid crystals. Now, a range of structures with topology reminiscent of a Möbius strip swim and transform into one another.

    • Hanqing Zhao
    • , Jung-Shen B. Tai
    •  & Ivan I. Smalyukh

  • News & Views |

    Superconductivity with an anisotropy is revealed in a layered material. This result points towards a version of superconductivity where spin–orbit interactions produce a material that is resilient to external magnetic fields.

    • Joseph Falson

  • Letter
    | Open Access

    The notion of chirality in dynamical systems with broken spatial symmetry but preserved time inversion symmetry has led to the concept of truly chiral phonons. These have now been observed in bulk HgS using circularly polarized Raman spectroscopy.

    • Kyosuke Ishito
    • , Huiling Mao
    •  & Takuya Satoh

  • Article |

    Shot noise has traditionally been used to measure the charge of quasiparticles in a variety of mesoscopic systems. However, at sufficiently low temperatures, this usual notion tends to break down for fractional quantum Hall effect states.

    • Sourav Biswas
    • , Rajarshi Bhattacharyya
    •  & Yuval Gefen

  • Research Briefing |

    A proposed materials design principle can facilitate the discovery of strongly correlated topological semimetals. It predicts promising candidate materials by cross referencing theoretical models based on realistic crystal structures with a materials database. This approach is verified by synthesizing and experimentally investigating a proposed material.

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