Ji Seop Oh

Temperature dependence of the dielectric function, critical points, and exciton spectral weight of bulk WSe2

Ji Seop Oh, Soyeun Kim

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Electronic Origin of Delicate Antiferromagnetism in Fe x NbS 2

Wenxin Li, Jonathan Reichanadter, Shan Wu, Ji Seop Oh et autres

Among the family of intercalated transition-metal dichalcogenides (TMDs), Fe_{x}NbS_{2} is found to possess unique current-induced resistive switching behaviors, tunable antiferromagnetic states, and a commensurate charge order, all of which are tied to a critical Fe doping of x_{c}=1/3. However, the electronic origin …

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Coexisting kagome and heavy fermion flat bands in YbCr6Ge6

Hanoh Lee, Churlhi Lyi, Taehee Lee, H. Na et autres

Flat bands, electronic states with nearly dispersionless energy-momentum structure, provide fertile ground for unconventional quantum phases. Recent observations of flat bands at the Fermi level in kagome metals open the possibility of unifying topology and correlation-driven heavy-fermion physics. Here we show that …

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Coexisting kagome and heavy fermion flat bands in YbCr6Ge6

Hanoh Lee, Churlhi Lyi, Taehee Lee, H. Na et autres

Flat bands, electronic states with nearly dispersionless energy-momentum structure, provide fertile ground for unconventional quantum phases. Recent observations of flat bands at the Fermi level in kagome metals open the possibility of unifying topology and correlation-driven heavy-fermion physics. Here we show that …

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Spin excitations and flat electronic bands in a Cr-based kagome superconductor

Zehao Wang, Yucheng Guo, H. Y. Huang, Fang Xie et autres

In the quest for topology- and correlation-driven quantum states, kagome lattice materials have garnered significant interest for their band structures, featuring flat bands (FBs) from the quantum destructive interference of the electronic wavefunction. Tuning an FB to the chemical potential could induce …

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Disentangling the intertwined orders in a magnetic kagome metal

Ji Seop Oh, Ananya Biswas, Mason Klemm, Hengxin Tan et autres

Intertwined orders appear when multiple orders are strongly interacting, and kagome metals have emerged as new platforms to explore exotic phases. FeGe has been found to develop a charge density wave (CDW) order within magnetic phase, suggesting an intricate interplay of the …

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Kramers nodal lines in intercalated TaS2 superconductors

Yichen Zhang, Yuxiang Gao, Aki Pulkkinen, Jianwei Huang et autres

Abstract Kramers degeneracy is one fundamental embodiment of the quantum mechanical nature of particles with half-integer spin under time reversal symmetry. Under the chiral and noncentrosymmetric achiral crystalline symmetries, Kramers degeneracy emerges respectively as topological quasiparticles of Weyl fermions and Kramers nodal …

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Observation of flat bands and Dirac cones in a pyrochlore lattice superconductor

Jianwei Huang, Chandan Setty, Liangzi Deng, Jing‐Yang You et autres

Emergent phases often appear when the electronic kinetic energy is comparable to the Coulomb interactions. One approach to seek material systems as hosts of such emergent phases is to realize localization of electronic wavefunctions due to the geometric frustration inherent in the …

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Spin Excitations and Flat Electronic Bands in a Cr-based Kagome Superconductor

Zehao Wang, Yucheng Guo, Fang Xie, Yuefei Huang et autres

In the quest for topology- and correlation-driven quantum states, kagome lattice materials have garnered significant interest for their band structures, featuring flat bands (FBs) from the quantum destructive interference of the electronic wavefunction. Tuning an FB to the chemical potential could induce …

Tailoring physical properties of crystals through synthetic temperature control: A case study for new polymorphic NbFeTe2 phases

Hanlin Wu, Sheng Li, Yan Lyu, Yucheng Guo et autres

Growth parameters play a significant role in the crystal quality and physical properties of layered materials. Here we present a case study on a van der Waals magnetic $\mathrm{NbFeT}{\mathrm{e}}_{2}$ material. Two different types of polymorphic $\mathrm{NbFeT}{\mathrm{e}}_{2}$ phases, synthesized at different temperatures, display …

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Erratum: Charge order induced Dirac pockets in the nonsymmorphic crystal TaTe4 [Phys. Rev. B 108 , 155121 (2023)]

Yichen Zhang, Ruixiang Zhou, Hanlin Wu, Ji Seop Oh et autres

Received 26 February 2024DOI:https://doi.org/10.1103/PhysRevB.109.199901©2024 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCharge orderDirac fermionsSymmetry protected topological statesPhysical SystemsChalcogenidesDirac semimetalTopological materialsTechniquesAngle-resolved photoemission spectroscopyDensity functional calculationsCondensed Matter, Materials & Applied Physics

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Tunability of charge density wave in a magnetic kagome metal

Ji Seop Oh, Ananya Biswas, Mason Klemm, Hengxin Tan et autres

The discovery of the charge density wave order (CDW) within a magnetically ordered phase in the kagome lattice FeGe has provided a promising platform to investigate intertwined degrees of freedom in kagome lattices. Recently, a method based on post-annealing has been suggested …