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Flat bands are interesting as their high density of states and suppressed kinetic energy result in strongly enhanced electronic correlations, leading to emergent and unconventional ordered states. Here, the authors use photoelectron momentum microscopy to map an isolated flat band in NbOCl₂ across the entire Brillouin zone, revealing its tunable quasiparticle band gap and offering a platform for flat-band physics exploration.

To experimentally confirm the predicted type-II Weyl fermions in transition metal dichalcogenide, the evidence of inversion symmetry breaking is required. Here, Zhanget al. report Raman spectroscopic evidence for the inversion symmetry breaking in MoTe₂.

A large spin-splitting is critical for many spintronic devices, however, many van der Waals materials are centrosymmetric, limiting the range of spin-splitting they can host. Here, Feng et al show that by annealing, it is possible to obtain a PtTe/PtTe₂ heterostructure, with an extremely large Rashba spin-splitting.

In black phosphorus, a model semiconductor, analysis of time and angle-resolved photoemission spectroscopy measurements demonstrates a strong light-induced band renormalization with light polarization dependence, suggesting pseudospin-selective Floquet band engineering.

Strong light-matter interaction provides opportunities for engineering electronic symmetry on an ultrafast timescale by forming photon-dressed states called Floquet-Bloch states. Here, the authors observe parity manipulation of Floquet-Bloch states by light fields in a model semiconductor - black phosphorus.

The transport behavior at the quantum limit may show exotic phenomena such as special interlayer quantum transport. Here, the authors observe negative interlayer magnetoresistance resulted from tunneling of Dirac fermions between the zeroth Landau levels in BaGa₂, indicating a feature at the quantum limit.

The phase diagram of twisted monolayer-bilayer graphene depends on the electric field direction, exhibiting phases similar to twisted bilayer and double-bilayer graphene. Here the authors study the field dependent electronic structure, in particular flat bands, using nano-ARPES and explain the field-tunability.

By combining nano-spot angle-resolved photoemission spectroscopy and atomic force microscopy, the authors resolve the fine electronic structure of the flat band and remote bands of twisted bilayer graphene as the twist angle varies, revealing a spectral weight transfer between remote bands that is attributed to lattice relaxations.

Transition metal monochalcogenides have been predicted to host interesting superconducting and topological properties, but their synthesis remains challenging. Here, the authors report a self-intercalation method driven by ionic liquid gating to obtain PdTe and NiTe single crystals from PdTe₂ and NiTe₂, respectively.

Monolayer transition metal dechalcogenides are a promising platform to study the interplay of low-dimensionality and electron correlations. Here, the authors report a Mott insulator state in monolayer 1T-TaSe₂, that survives far above room temperature and is robust against external perturbations.

Obtaining spatially-resolved electronic structure information at the microscale is key to a complete understanding of phase transitions and domain separation in the solid-state. Here, micro- and nanoscale angle-resolved photoemission spectroscopy reveals the electronic structure of domains in the striped phase of IrTe₂.

Black phosphorus is reported to be a bipolar pseudospin semiconductor, exhibiting a net pseudospin polarization with opposite polarization directions for the conduction and valence bands. These properties make it a promising candidate for application in pseudospintronics.

The superconducting critical temperature of monolayer materials is often lower than their bulk counterparts. Now, intercalation is shown to induce two-dimensional superconducting properties while maintaining the bulk critical temperature.

Light–matter interaction in 2D and topological materials provides a fascinating control knob for inducing emergent, non-equilibrium properties and achieving new functionalities in the ultrafast timescale. This Review discusses recent experimental progress on the light-induced phenomena and provides perspectives on the opportunities of proposed light-induced phenomena, as well as open experimental challenges.