Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/17113
標題: Probing the microwave magnetotransport properties of the edge states of a two-dimensional electron system
探測二維電子系統邊緣態之微波磁傳輸特性
作者: 鍾坤烜
Chung, Kun-Hsuan
關鍵字: Integer Quantum Hall Effect
量子霍爾效應
Coplanar Waveguide
edge magnetoplasma
共平面波導
邊緣磁電漿子
出版社: 物理學系所
引用: [1] D. C. Glattli, E. Y. Andrei, G. Deville, J. Poitrenaud, and F. I. B. Williams, Phys. Rev. Lett. 54, 1710 (1985). [2] V. I. Talyanskii, A. V. Polisski, D. D. Arnone, M. Pepper, C. G. Smith, D. A. Ritchie, J. E. Frost, and G. A. C. Jones, Phys. Rev. B 46, 12427 (1992). [3] M. Wassermeier, J. Oshinowo, J. P. Kotthaus, A. H. MacDonald , C. T. Foxon, and J. J. Harris, Phys. Rev. B 41, 10287 (1990). [4] V. A. Volkov and S. A. Mikhalov, JEPT Lett. 42, 557 (1985). [5] A. E. Kuchma, V. A. Sverdlov, Phys. Rev. B 54, 16333 (1996). [6] Y. W. Suen, W. H. Hsieh, C. L. Chen, L. C. Li, C. H. Kuan, RSI. 76, 084704 (2005) [7] C. P. Wen, IEEE Trans. Microwave Theory Tech. 17, 1087 (1969). [8] L. W. Engel, D. Shahar, C. Kurdak, and D. C. Tsui, Phys. Rev. Lett. 71, 2638 (1993) [9] 張紓語碩士論文,”量子線陣列在磁場中之動態特性” (國立中興大學物理系, 2004) [10] D. K Cheng, ”Field and Wave Electromagnetics”Addison Wesley (1989) [11] 謝文興博士論文,”High-Frequency Dynamic Magnetotransport Properties of Low-Dimensional Electron Systems”(國立台灣大學電機工程系,2005) [12] 萬德昌碩士論文,”利用共平面波導探測二維系統的高頻磁傳輸特性”(國立中興大學物理系, 2002) [13] T. Ando, A. B. Fowler, and F. Stern, Rev. Mod. Phys. 54, 437 (1982) [14] J. Singh, ”Physics of Semiconductors and Their Hetrostructures”MacGraw Hill (1993) [15] K. von Klitzing, G. Dorda, and M. Pepper, Phys. Rev. Lett. 45, 494 (1980) [16] B. N. Taylor, Physics Today 42, 23 (1989) [17] D. B. Mast, A. J. Dahm, and A. L. Fetter, Phys. Rev. Lett. 54, 1706 (1985) [18] V. A. Volkov and S. A. Mikhailov. Sov. Phys.JEPT, 67, 1639 (1988) [19] M. Wassermeier, J. Oshinowo, J. P. Kotthaus, A. H. MacDonald , C. T. Foxon, and J. J. Harris, Phys. Rev. B 41, 10287 (1990) [20] W. H. Hsieh, Y. W. Suen, S. Y. Chang, L. C. Li, C. H.Kuan, B. C. Lee, and C. P. Lee, Appl. Phys. Lett. 85, 4196 (2004) [21] 宋育泰碩士論文,”高感度低飄移微波向量偵測器應用在低溫低維度電子系統” (國立中興大學物理系, 2006) [22] 陳君豪碩士論文,” 二維電子中反量子線之高頻磁傳輸特性” (國立中興大學物理系, 2007)
摘要: 本篇論文主要研究二維電子系統邊緣態之磁傳輸特性。我們在GaAs/AlGaAs異質結構的二維電子系統基板上製作一共平面波導,並以電子束微影製程及濕式蝕刻製程嵌入一反量子線陣列。共兩塊樣品,量子線寬度皆為0.5um,而長度分別為4um及8um。利用實驗室製作的超高感度微波向量器觀察微波訊號輸入樣品後相位及振幅的微小變化。藉此觀察微波振幅及相位的變化,再經由理論計算可獲得在整數量子霍爾平臺(filling factor=1及filling factor=2)處之二維電導率實部及虛部微小變化情況。我們在頻率f=100MHz~500MHz時,觀察到量子線長度為4um之樣品其量子霍爾平臺處有不規則的吸收情況,此實驗結果可用邊緣磁電漿子激發(edge magnetoplasma excitations)來作解釋。然而在量子線長度為8um之樣品卻出現不同的吸收情況及相位變化特性,我們認為此結果應為其他一維系統激發態所造成。
High-frequency magnetotransport properties of the edge states of two-dimensional electron system (2DES) are studied with a coplanar waveguide (CPW) broadband sensor where anti-wires are embedded in its slots. The series of anti-wires on a 2DEG were fabricated by e-beam lithography and wet etching process. The anti-wires are 0.5um wide and 4um and 8um in length for two different samples. The variations of the phase and the amplitude of microwave signals passing through the sample were measured by a home-made ultra-high sensitivity microwave vector meter. The tiny change of the real and the imaginary part of the conductivities due to the anti-wires in the integer-quantum-Hall plateau (filling factor=1 and filling factor=2) can be extracted therefrom. We observed an anomalous absorption together with phase change in the filling factor=2 plateau regime for a 4um-long anti-wire array in the frequency range from 100MHz to 500MHz. These experimental results can be explained by the edge magnetoplasma excitations. However, in the 8um-long anti-wire array sample, a very different absorption and phase change features were appeared. This may be attributed to low-lying excitations or spin-wave excitations in the one-dimensional system.
URI: http://hdl.handle.net/11455/17113
其他識別: U0005-0802201010082700
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0802201010082700
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