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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 管傑雄(Chieh-Hsiung Kuan) | |
| dc.contributor.author | Wen-Hsing Hsieh | en |
| dc.contributor.author | 謝文興 | zh_TW |
| dc.date.accessioned | 2021-06-13T17:26:57Z | - |
| dc.date.available | 2008-01-11 | |
| dc.date.copyright | 2005-01-11 | |
| dc.date.issued | 2005 | |
| dc.date.submitted | 2005-01-11 | |
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Observability of counterpropagating modes at fractional quantum hall edges. Phys. Rev. B, 58:13778-13781, 1998. [83] C. Dahl, F. Brinkop, and A. Wixforth. Dimensional resonances in elliptic electrondisks. Solid State Commun., 80:673-676, 1991. [84] The etching solvate is H2SO4 :H2O2 :H2O= 1 : 8 : 40. The etching rate of this solvate is about 220 ºA/sec. [85] K. K. Choi, D. C. Tsui, and K. Alavi. Experimental determination of the edge depletion width of ahe two¡dimensional electron gas in GaAs/AlxGa1¡xAs. Appl. Phys. Lett., 50:110-112, 1987. [86] Thurlby Thandar Instruments Ltd., Huntingdon, Cambridgeshire PE29 7DR, U.K. [87] Mini-Circuits, Brooklyn, NY. [88] Maxim Integrated Products, Sunnyvale, CA. [89] Intersil Corporation, Milpitas, CA. [90] Analog Devices, Inc., Norwood, MA. [91] In this design, we need to insert a TTL invertor between the TTL1 and the controllead of the analog switch. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/39368 | - |
| dc.description.abstract | In this thesis, I report a systematic studies of the high-frequency magnetotransport properties of low-dimensional electron systems (LDESs) in low-temperature. One of our most important achievement is the development of an ultra-high-sensitivity microwave vector detection system, which delivers an extremely low power level signal to the LDESs under test. The high sensitivity and resolution of our detection system, which have achieved 0.005% and 0.001degree resolutions in amplitude and phase variations at 10 GHz with an average signal power below -100 dBm, together with the coplanar-wave-guide broad band sensor, allow us to probe the very tiny change of the microwave signal due to the presence of the LDES and to explore the underlying new physics. From the measured phase variation, we can distinguish a very tiny change in the induced dipole moment of each quantum wire. Our system outperforms most of the commercial vector network analyzers (VNAs).
Both the real and the imaginary parts of high-frequency conductivity of two-dimensional electron systems in two different heterostructures especially near the center of the integer quantum Hall (IQH) plateau at the frequency range from 100 MHz up to 18 GHz are carefully investigated. Studies of the frequency dependence of real part of the complex conductivity near the center of the IQH plateau shows an interesting power law dependence between the localization length and the magnetic field difference away from the plateau center with an exponent close to 2.3. The other important part of this thesis is the high-frequency magnetotransport properties of carriers in a quantum-wire (QW) array at 0.3K. The QW array consists of 7200 QWs fabricated from a 2DES in a GaAs/AlGaAs heterostructure by e-beam lithography and wet etching processes. These QWs are embedded in the gap of a 50 ohm meandering coplanar waveguide (CPW). The microwave spectrum of this QW array is carefully studied. The results exhibit a series of absorption dips, whose frequencies show a bell-shaped magnetic-field dependence corresponding to each IQH plateau. This bell-shaped dependence can be attributed to edge magnetoplasma (EMP) excitations of the QW array, and has been theoretically predicted. Besides that, we also observe a strong absorption extending from the top of each bell-shaped spectrum to the side IQH plateau as the frequency increases, and map out the transition behavior from EMP absorption region to IQHE-typed or Shubnikov-de-Hass-(SdH)-typed adsorption. This observation reveals that the IQH and SdH oscillations are screened at frequencies below the EMP frequencies. At the end, I will present the resonance peaks at fields below that SdH oscillations start. These adsorption peaks may be attributed to the hybrid modes of the cyclotron resonance and the two-dimensional bulk plasma. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T17:26:57Z (GMT). No. of bitstreams: 1 ntu-94-D88921005-1.pdf: 8454641 bytes, checksum: da2c697e569996e2b0c2d2aa2f41eae4 (MD5) Previous issue date: 2005 | en |
| dc.description.tableofcontents | Abstract iii
Acknowledgements v List of Abbreviations and Symbols vi Contents vii List of Figures x List of Tables xvii 1 Intorduction 1 1.1 Brief review of 2DESs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 High-frequency magnetotransport properties of LDESs . . . . . . . . . . 3 1.2.1 High-frequency magnetotransport properties of 2DESs . . . . . . 3 1.2.2 Edge magnetoplasma excitations in LDESs . . . . . . . . . . . . . 4 1.3 Structure of the thesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Ultra-high-sensitivity microwave vector detection for probing LDESs 8 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Design of the microwave vector detection system . . . . . . . . . . . . . . 10 2.3 Performance of the detection system . . . . . . . . . . . . . . . . . . . . 11 2.4 Using the detection system to probe a quantum-wire array . . . . . . . . 11 2.5 Measurement of the susceptibility of a quantum wire . . . . . . . . . . . 13 2.6 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 vii 3 Localizations lengths of 2DESs in IQH plateau regions 20 3.1 Scaling behaviors of a 2DES . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.2 Sample preparations and experimental set-up . . . . . . . . . . . . . . . 23 3.2.1 Sample preparations . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.2.2 Experimental set-up . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.3 Experimental results and discussions . . . . . . . . . . . . . . . . . . . . 26 3.3.1 f-dependence scaling behaviors for lm4116c4 . . . . . . . . . . . . 26 3.3.2 T-dependence behaviors for lm4116c6 . . . . . . . . . . . . . . . . 29 3.3.3 The e®ect of edge on the scaling behaviors in IQH plateaus . . . . 29 3.3.4 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.4 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4 Edge magnetoplasma excitations in quantum-wire arrays 61 4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 4.1.1 Classical theory of EMP in a quantum wire array . . . . . . . . . 62 4.1.2 Properties of EMPs in LDESs . . . . . . . . . . . . . . . . . . . . 64 4.2 Sample preparation and experimental set-up . . . . . . . . . . . . . . . . 65 4.2.1 Sample preparations . . . . . . . . . . . . . . . . . . . . . . . . . 65 4.2.2 Experimental set-up . . . . . . . . . . . . . . . . . . . . . . . . . 66 4.3 Experimental results and discussions . . . . . . . . . . . . . . . . . . . . 67 4.3.1 Dynamic properties of EMP excitations for lm3979c6 in IQHE regimes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 4.3.2 High-frequency absorption at low magnetic ‾elds . . . . . . . . . 70 4.4 conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 5 Conclusions 92 5.1 Ultra-high-sensitivity microwave vector detection for probing LDESs . . . 92 5.2 Localization lengths of 2DESs in IQH plateau regions . . . . . . . . . . . 93 5.3 Edge magnetoplasma excitations in quantum-wire arrays . . . . . . . . . 93 viii A Instrumentation of a high-sensitivity microwave vector detection system 95 A.1 System and circuit designs . . . . . . . . . . . . . . . . . . . . . . . . . . 95 A.1.1 Description of the Complete System . . . . . . . . . . . . . . . . 95 A.1.2 Pulse Handling Circuits and the Integrator . . . . . . . . . . . . . 97 A.1.3 Microwave Modules . . . . . . . . . . . . . . . . . . . . . . . . . . 98 A.2 Results and Discussions . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 A.2.1 Response of the PLL . . . . . . . . . . . . . . . . . . . . . . . . . 98 A.2.2 Detection Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 B The conductivity of a 2DES 110 B.1 Wave characteristics of a transmission line . . . . . . . . . . . . . . . . . 111 References 115 | |
| dc.language.iso | en | |
| dc.subject | 半導體 | zh_TW |
| dc.subject | 異質接面 | zh_TW |
| dc.subject | 磁傳輸 | zh_TW |
| dc.subject | 微波 | zh_TW |
| dc.subject | hetetostructure | en |
| dc.subject | microwave | en |
| dc.subject | magnetotransport | en |
| dc.subject | semiconductor | en |
| dc.title | 低維度電子系統的高頻動態磁傳輸特性之研究 | zh_TW |
| dc.title | High-Frequency Dynamic Magnetotransport Properties of Low-Dimensional Electron Systems | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 93-1 | |
| dc.description.degree | 博士 | |
| dc.contributor.coadvisor | 孫允武(Yuen-Wuu Suen) | |
| dc.contributor.oralexamcommittee | 郭華丞(Watson Kuo),簡紋濱(Wen-Bin Jian),孫建文(Kien-Wen Suen),賴聰賢(Tsong-Sheng Lay),陳?東(Chii-Dong Chen),吳仲卿(Jong-Ching Wu) | |
| dc.subject.keyword | 磁傳輸,微波,異質接面,半導體, | zh_TW |
| dc.subject.keyword | semiconductor,microwave,magnetotransport,hetetostructure, | en |
| dc.relation.page | 13 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2005-01-11 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電機工程學研究所 | zh_TW |
| 顯示於系所單位： | 電機工程學系 | |
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| ntu-94-1.pdf 未授權公開取用 | 8.26 MB | Adobe PDF |
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