| Item type |
文献 / Documents(1) |
| 公開日 |
2023-02-01 |
| アクセス権 |
|
|
アクセス権 |
open access |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版社版DOI |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.1103/PhysRevB.107.045141 |
|
|
言語 |
ja |
|
|
関連名称 |
10.1103/PhysRevB.107.045141 |
| 出版タイプ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| タイトル |
|
|
タイトル |
Pressure suppression of the excitonic insulator state in Ta2NiSe5 observed by optical conductivity |
|
言語 |
en |
| 著者 |
岡村, 英一
ミゾカワ
ミキ
マツイ
野口, 直樹
カタヤマ
サワ
ノハラ
Lu, Y.
タカギ
イケモト
モリワキ
|
| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
The layered chalcogenide Ta2NiSe5 has recently attracted much interest as a strong candidate for a long-sought excitonic insulator (EI). Since the physical properties of an EI are expected to depend sensitively on the external pressure (P), it is important to clarify the P evolution of a microscopic electronic state in Ta2NiSe5. Here we report the optical conductivity [σ (ω)] of Ta2NiSe5 measured at high P to 10 GPa and at low temperatures to 8 K. With cooling at P = 0, σ (ω) develops an energy gap of about 0.17 eV and a pronounced excitonic peak at 0.38 eV as reported previously. With increasing P, the energy gap becomes narrower and the excitonic peak is diminished. Above a structural transition at Ps ≃ 3 GPa, the energy gap becomes partially filled, indicating that Ta2NiSe5 is a semimetal after the EI state is suppressed by P. At higher P, σ (ω) exhibits metallic characteristics with no energy gap. The detailed P evolution of the energy gap and σ (ω) is presented, and discussed mainly in terms of a weakening of excitonic correlation with P. |
|
言語 |
en |
| 書誌情報 |
en : Physical Review B
巻 107,
号 4,
p. 045141,
発行日 2023-01-27
|
| 収録物ID |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
24699950 |
| 収録物ID |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
24699969 |
| 収録物ID |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA11187113 |
| 収録物ID |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA11734533 |
| 出版者 |
|
|
出版者 |
American Physical Society |
|
言語 |
en |
| 権利情報 |
|
|
言語 |
en |
|
権利情報 |
©2023 American Physical Society |
| EID |
|
|
識別子 |
393839 |
|
識別子タイプ |
URI |
| 言語 |
|
|
言語 |
eng |
physrevb_107_4_045141.pdf (544 KB)
