|
ИСТИНА |
Войти в систему Регистрация |
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
Laser-induced persistent photovoltage on the surface of a ternary topological insulator at room temperatureстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 11 мая 2017 г.
- Авторы: Sánchez-Barriga J., Battiato M., Golias E., Varykhalov A., Romualdi A., Yashina L.V., Kornilov O., Rader O.
- Журнал: Applied Physics Letters
- Том: 110
- Год издания: 2017
- Издательство: AIP Publishing
- Местоположение издательства: United States
- Первая страница: 141605
- DOI: 10.1063/1.4979596
- Аннотация: Using time- and angle-resolved photoemission, we investigate the ultrafast response of excited electrons in the ternary topological insulator (Bi1-xSbx)2Te3 to fs-infrared pulses. We demonstrate that at the critical concentration x = 0.55, where the system becomes bulk insulating, a surface voltage can be driven at room temperature through the topological surface state solely by optical means. We further show that such a photovoltage persists over a time scale that exceeds ∼6 μs, i.e, much longer than the characteristic relaxation times of bulk states. We attribute the origin of the photovoltage to a laser-induced band-bending effect which emerges near the surface region on ultrafast time scales. The photovoltage is also accompanied by a remarkable increase in the relaxation times of excited states as compared to undoped topological insulators. Our findings are relevant in the context of applications of topological surface states in future optical devices.
- Добавил в систему: Яшина Лада Валерьевна