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Band hybridization at the semimetal-semiconductor transition of Ta 2NiSe 5 enabled by mirror-symmetry breaking

Watson, Matthew D.; Marković, Igor; Morales, Edgar Abarca; Le Fèvre, Patrick; Merz, Michael; Haghighirad, Amir A.; King, Philip D. C.

Abstract:

We present a combined study from angle-resolved photoemission and density-functional-theory calculations of the temperature-dependent electronic structure in the excitonic insulator candidate Ta2NiSe5. Our experimental measurements unambiguously establish the normal state as a semimetal with a significant band overlap of >100 meV. Our temperature-dependent measurements indicate how these low-energy states hybridize when cooling through the well-known 327 K phase transition in this system. From our calculations and polarization-dependent photoemission measurements, we demonstrate the importance of a loss of mirror symmetry in enabling the band hybridization, driven by a shearlike structural distortion which reduces the crystal symmetry from orthorhombic to monoclinic. ... mehr

Abstract (englisch):

We present a combined study from angle-resolved photoemission and density-functional-theory calculations of the temperature-dependent electronic structure in the excitonic insulator candidate Ta2NiSe5. Our experimental measurements unambiguously establish the normal state as a semimetal with a significant band overlap of >100 meV. Our temperature-dependent measurements indicate how these low-energy states hybridize when cooling through the well-known 327 K phase transition in this system. From our calculations and polarizationdependent photoemission measurements, we demonstrate the importance of a loss of mirror symmetry in enabling the band hybridization, driven by a shearlike structural distortion which reduces the crystal symmetry from orthorhombic to monoclinic. ... mehr

Zugehörige Institution(en) am KIT Institut für QuantenMaterialien und Technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 02.03.2020
Sprache Englisch
Identifikator ISSN: 2643-1564
KITopen-ID: 1000117678
HGF-Programm 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Physical review research
Verlag American Physical Society (APS)
Band 2
Heft 1
Seiten Article no: 013236
Vorab online veröffentlicht am 29.02.2020
Schlagwörter Band hybridization at the semimetal-semiconductor; 2019-022-025949; 2020-024-029049 WERA
Nachgewiesen in Dimensions

Verlagsausgabe §
DOI: 10.5445/IR/1000117678
Veröffentlicht am 28.11.2021
Originalveröffentlichung
DOI: 10.1103/PhysRevResearch.2.013236
Dimensions
Zitationen: 66
Seitenaufrufe: 111
seit 13.03.2020
Downloads: 59
seit 30.11.2021
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