We report temperature-dependent angle-resolved photoemission spectroscopy measurement of Ta2NiSe5 which shows a semiconductor-semiconductor structural phase transition at around 330 K. Characteristically, flat band at the top of the valence band is observed, which is ascribed to the excitonic insulator effect. The top valence band shifts to higher binding energy and its bandwidth increases as the temperature decreases. As the system exceeds the transition temperature, the flat feature of the valence band weakens though the exciton fluctuations remain finite.

Photoemission Spectroscopy of Ta2NiSe5 / Y., Wakisaka; T., Sudayama; K., Takubo; T., Mizokawa; Saini, Naurang Lal; M., Arita; H., Namatame; M., Taniguchi; N., Katayama; M., Nohara; H., Takagi. - In: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM. - ISSN 1557-1939. - STAMPA. - 25:5(2012), pp. 1231-1234. [10.1007/s10948-012-1526-0]

Photoemission Spectroscopy of Ta2NiSe5

SAINI, Naurang Lal;
2012

Abstract

We report temperature-dependent angle-resolved photoemission spectroscopy measurement of Ta2NiSe5 which shows a semiconductor-semiconductor structural phase transition at around 330 K. Characteristically, flat band at the top of the valence band is observed, which is ascribed to the excitonic insulator effect. The top valence band shifts to higher binding energy and its bandwidth increases as the temperature decreases. As the system exceeds the transition temperature, the flat feature of the valence band weakens though the exciton fluctuations remain finite.
2012
01 Pubblicazione su rivista::01a Articolo in rivista
Photoemission Spectroscopy of Ta2NiSe5 / Y., Wakisaka; T., Sudayama; K., Takubo; T., Mizokawa; Saini, Naurang Lal; M., Arita; H., Namatame; M., Taniguchi; N., Katayama; M., Nohara; H., Takagi. - In: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM. - ISSN 1557-1939. - STAMPA. - 25:5(2012), pp. 1231-1234. [10.1007/s10948-012-1526-0]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/448536
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