Observation of multiple flat bands and Van Hove singularities in the distorted kagome metal NdTi3Bi4

Mazharul Islam Mondal; Anup Pradhan Sakhya; Milo Sprague; Brenden R. Ortiz; Matthew Matzelle; Arun K. Kumay; Avike Seal; Barun Ghosh; Arun Bansil; Madhab Neupane

doi:10.1103/mhj5-ws5v

Observation of multiple flat bands and Van Hove singularities in the distorted kagome metal NdTi₃Bi₄

Mazharul Islam Mondal
, Anup Pradhan Sakhya
, Milo Sprague
, Brenden R. Ortiz
, Matthew Matzelle
, Arun K. Kumay
, Avike Seal
, Barun Ghosh
, Arun Bansil
, Madhab Neupane

Correlated Electron Materials

Research output: Contribution to journal › Letter › peer-review

2 Scopus citations

Abstract

Kagome materials have attracted enormous research interest recently owing to their diverse topological phases and manifestation of electronic correlation. Here, we present the electronic structure of a distorted ferromagnetic kagome metal, NdTi₃Bi₄, exhibiting a transition temperature of 9 K. Our investigation employs a combination of angle-resolved photoemission spectroscopy (ARPES) measurements and density functional theory (DFT) calculations.We discover the presence of two “flat” bands which are found to originate from the kagome structure formed by Ti atoms with a major contribution from Ti d_xy and Ti d_x²−y² orbitals. We also observed multiple Van Hove singularities (VHSs) in its electronic structure, with one VHS lying near the Fermi level. The ARPES data reveal the existence of Dirac cone at the K point, a finding which is corroborated by our DFT calculations. These findings present a detailed electronic structure capable of hosting correlation-driven phenomenon in this novel ferromagnetic kagome metal.

Original language	English
Pages (from-to)	L1211041-L1211047
Journal	Physical Review B
Volume	112
Issue number	12
DOIs	https://doi.org/10.1103/mhj5-ws5v
State	Published - Sep 10 2025

Funding

Work performed by M.N., M.I.M., and A.K.K. at the University of Central Florida was supported by the DOE Office of Science, Basic Energy Sciences (BES), under Award No. DE-SC0024304. A.P.S. and M.S. acknowledge support from the Air Force Office of Scientific Research MURI, Grant No. FA9550-20-1-0322. Work performed by B.R.O. is sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy. The work at Northeastern University was supported by the Air Force Office of Scientific Research under award number FA9550-20-1-0322 and benefited from the resources of Northeastern University’s Advanced Scientific Computation Center, the Discovery Cluster, the Quantum Materials and Sensing Institute, and the Massachusetts Technology Collaborative award MTC-22032. The work at S. N. Bose National Centre for Basic Sciences (SNBNCBS) was supported by Prime Minister Early Career Research Grant (PM-ECRG) from Anusandhan National Research Foundation (ANRF), file number ANRF/ECRG/2024/003677/PMS, and also benefited from the PARAM-Rudra computational facility at SNBNCBS. This research used resources of the Advanced Light Source, a U.S. Department of Energy Office of Science User Facility, under Contract No. DE-AC02-05CH11231. We thank Sung-Kwan Mo for beamline assistance at the Advanced Light Source (ALS), Lawrence Berkeley National Laboratory.

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title = "Observation of multiple flat bands and Van Hove singularities in the distorted kagome metal NdTi3Bi4",

abstract = "Kagome materials have attracted enormous research interest recently owing to their diverse topological phases and manifestation of electronic correlation. Here, we present the electronic structure of a distorted ferromagnetic kagome metal, NdTi3Bi4, exhibiting a transition temperature of 9 K. Our investigation employs a combination of angle-resolved photoemission spectroscopy (ARPES) measurements and density functional theory (DFT) calculations.We discover the presence of two “flat” bands which are found to originate from the kagome structure formed by Ti atoms with a major contribution from Ti dxy and Ti dx2−y2 orbitals. We also observed multiple Van Hove singularities (VHSs) in its electronic structure, with one VHS lying near the Fermi level. The ARPES data reveal the existence of Dirac cone at the K point, a finding which is corroborated by our DFT calculations. These findings present a detailed electronic structure capable of hosting correlation-driven phenomenon in this novel ferromagnetic kagome metal.",

author = "Mondal, \{Mazharul Islam\} and Sakhya, \{Anup Pradhan\} and Milo Sprague and Ortiz, \{Brenden R.\} and Matthew Matzelle and Kumay, \{Arun K.\} and Avike Seal and Barun Ghosh and Arun Bansil and Madhab Neupane",

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doi = "10.1103/mhj5-ws5v",

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T1 - Observation of multiple flat bands and Van Hove singularities in the distorted kagome metal NdTi3Bi4

AU - Mondal, Mazharul Islam

AU - Sakhya, Anup Pradhan

AU - Sprague, Milo

AU - Ortiz, Brenden R.

AU - Matzelle, Matthew

AU - Kumay, Arun K.

AU - Seal, Avike

AU - Ghosh, Barun

AU - Bansil, Arun

AU - Neupane, Madhab

PY - 2025/9/10

Y1 - 2025/9/10

N2 - Kagome materials have attracted enormous research interest recently owing to their diverse topological phases and manifestation of electronic correlation. Here, we present the electronic structure of a distorted ferromagnetic kagome metal, NdTi3Bi4, exhibiting a transition temperature of 9 K. Our investigation employs a combination of angle-resolved photoemission spectroscopy (ARPES) measurements and density functional theory (DFT) calculations.We discover the presence of two “flat” bands which are found to originate from the kagome structure formed by Ti atoms with a major contribution from Ti dxy and Ti dx2−y2 orbitals. We also observed multiple Van Hove singularities (VHSs) in its electronic structure, with one VHS lying near the Fermi level. The ARPES data reveal the existence of Dirac cone at the K point, a finding which is corroborated by our DFT calculations. These findings present a detailed electronic structure capable of hosting correlation-driven phenomenon in this novel ferromagnetic kagome metal.

AB - Kagome materials have attracted enormous research interest recently owing to their diverse topological phases and manifestation of electronic correlation. Here, we present the electronic structure of a distorted ferromagnetic kagome metal, NdTi3Bi4, exhibiting a transition temperature of 9 K. Our investigation employs a combination of angle-resolved photoemission spectroscopy (ARPES) measurements and density functional theory (DFT) calculations.We discover the presence of two “flat” bands which are found to originate from the kagome structure formed by Ti atoms with a major contribution from Ti dxy and Ti dx2−y2 orbitals. We also observed multiple Van Hove singularities (VHSs) in its electronic structure, with one VHS lying near the Fermi level. The ARPES data reveal the existence of Dirac cone at the K point, a finding which is corroborated by our DFT calculations. These findings present a detailed electronic structure capable of hosting correlation-driven phenomenon in this novel ferromagnetic kagome metal.

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DO - 10.1103/mhj5-ws5v

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VL - 112

SP - L1211041-L1211047

JO - Physical Review B

JF - Physical Review B

IS - 12

ER -

Observation of multiple flat bands and Van Hove singularities in the distorted kagome metal NdTi₃Bi₄

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