https://scholars.lib.ntu.edu.tw/handle/123456789/339691
標題: | Thermopower measurements of semiconductor quantum dots | 作者: | Dzurak, A.S. Smith, G.G. Barnes, C.H.W. Pepper, M. Mart{\\'i CHI-TE LIANG |
關鍵字: | Coulomb blockade; Quantum dots; Thermopower | 公開日期: | 1998 | 卷: | 249-251 | 起(迄)頁: | 281-285 | 來源出版物: | Physica B: Condensed Matter | 摘要: | We discuss the use of electron-gas heating for measurements of the diffusion thermopower S of a quantum dot in the regime of single-electron charging. The voltage across a dot in the presence of an electron temperature gradient oscillates about zero with a period equal to that of the Coulomb blockade (CB) oscillations in electrical conductance G. The magnitude of S associated with this thermovoltage has been deduced through a detailed investigation of the temperature gradient in the device. The magnitude and line shape of the resulting thermopower indicate that transport through the dot is a coherent tunneling process, meaning that a simple Mott formulation can be used to relate G and S. In addition, a reproducible fine structure on top of the CB oscillations in S has been observed which appears to result from the N-particle excitation spectrum of the dot. © 1998 Elsevier Science B.V. All rights reserved. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-0032091420&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/339691 |
ISSN: | 09214526 | DOI: | 10.1016/S0921-4526(98)00115-X | SDG/關鍵字: | Electric resistance; Electron energy levels; Electron tunneling; Spectrum analysis; Coulomb blockade (CB); Diffusion thermopower; Electron gas heating; Semiconductor quantum dots |
顯示於: | 物理學系 |
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