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Spectroscopic evidence of flat bands in breathing kagome semiconductor Nb₃I₈

Niobium halide semiconductors are interesting for their breathing kagome geometry, easily exfoliable layered structure, and potential two-dimensional magnetism. Here, experimental evidence of flat bands in Nb₃I₈, originating from the niobium breathing kagome lattice, is observed using angle-resolved photoemission spectroscopy and supported by first-principles calculations.

Sabin Regmi
Tharindu Fernando
Madhab Neupane
ResearchOpen Access16 Dec 2022
Communications Materials

Volume: 3, P: 1-6
Ultrafast relaxation of acoustic and optical phonons in a topological nodal-line semimetal ZrSiS

Topological nodal line semimetals are characterised by band crossings along a line, or closed loop inside, of the Brillouin zone and belong to a larger family of topological semimetals. Here, using time-resolved angle resolved photoemission spectroscopy, the authors investigate the ultrafast relaxation dynamics in the bulk nodal line state of one such material, ZrSiS, elucidating the role of optical and acoustic phonon cooling.

Yangyang Liu
Gyanendra Dhakal
Madhab Neupane
ResearchOpen Access10 Aug 2022
Communications Physics

Volume: 5, P: 1-6
Observation of gapped state in rare-earth monopnictide HoSb

M. Mofazzel Hosen
Gyanendra Dhakal
Madhab Neupane
ResearchOpen Access31 Jul 2020
Scientific Reports

Volume: 10, P: 1-8
Discovery of topological nodal-line fermionic phase in a magnetic material GdSbTe

M. Mofazzel Hosen
Gyanendra Dhakal
Madhab Neupane
ResearchOpen Access05 Sept 2018
Scientific Reports

Volume: 8, P: 1-7
Observation of Dirac state in half-Heusler material YPtBi

M. Mofazzel Hosen
Gyanendra Dhakal
Madhab Neupane
ResearchOpen Access23 Jul 2020
Scientific Reports

Volume: 10, P: 1-6
Distinct multiple fermionic states in a single topological metal

The existence of multiple topological phases in a single material, although theoretically possible, has not been verified. Here, the authors observe weak topological insulator surface states and a one-dimensional Dirac-node crossing surface state in a single metallic material Hf₂Te₂P.

M. Mofazzel Hosen
Klauss Dimitri
Madhab Neupane
ResearchOpen Access01 Aug 2018
Nature Communications

Volume: 9, P: 1-8
Experimental observation of drumhead surface states in SrAs₃

M. Mofazzel Hosen
Gyanendra Dhakal
Madhab Neupane
ResearchOpen Access17 Feb 2020
Scientific Reports

Volume: 10, P: 1-9

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Spectroscopic evidence of flat bands in breathing kagome semiconductor Nb3I8

Ultrafast relaxation of acoustic and optical phonons in a topological nodal-line semimetal ZrSiS

Observation of gapped state in rare-earth monopnictide HoSb

Discovery of topological nodal-line fermionic phase in a magnetic material GdSbTe

Observation of Dirac state in half-Heusler material YPtBi

Distinct multiple fermionic states in a single topological metal

Experimental observation of drumhead surface states in SrAs3

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Spectroscopic evidence of flat bands in breathing kagome semiconductor Nb₃I₈

Experimental observation of drumhead surface states in SrAs₃