Development of a robust platform for spin qubits in SiGe heterostructures:
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| Main Author: | |
|---|---|
| Format: | Thesis Book |
| Language: | English |
| Published: |
Garching b. München
Verein zur Förderung des Walter-Schottky-Inst. der Techn. Univ. München
2013
|
| Edition: | 1. Aufl. |
| Series: | Selected Topics of Semiconductor Physics and Technology
Vol. 161 |
| Subjects: | |
| Online Access: | Inhaltsverzeichnis |
| Physical Description: | VII, 191 S. Ill., graph. Darst. |
| ISBN: | 9783941650619 |
Staff View
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| 245 | 1 | 0 | |a Development of a robust platform for spin qubits in SiGe heterostructures |c Andreas Wild |
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| 264 | 1 | |a Garching b. München |b Verein zur Förderung des Walter-Schottky-Inst. der Techn. Univ. München |c 2013 | |
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Record in the Search Index
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| adam_text | IMAGE 1
CONTENTS
ABSTRACT I
ZUSAMMENFASSUNG III
1 INTRODUCTION 1
2 THEORETICAL CONCEPTS 7
2.1 NUCLEAR SPIN ENGINEERED 2DES IN SI/SIGE HETEROSTRUCTURES 7
2.1.1 THE SI/SIGE MATERIAL SYSTEM 7
2.1.2 ELECTRONIC PROPERTIES OF 2DES IN SI/SIGE 11
2.1.3 THEORY OF SELF-CONSISTENT BAND STRUCTURE SIMULATIONS 16 2.2
DEVICES AND CHARACTERIZATION TECHNIQUES 19
2.2.1 2D SYSTEMS 19
2.2.2 QUANTUM POINT CONTACTS 21
2.2.3 QUANTUM DOTS 24
2.3 DEVICE FABRICATION 31
2.3.1 FABRICATION STEPS 31
2.3.2 SAMPLE STRUCTURE 31
2.3.3 MATERIAL SELECTION 33
2.4 EXPERIMENTAL SETUP 33
3 AN ELECTROSTATICALLY DEFINED DOUBLE QD IN A NATURAL SI 2DES 37
3.1 2DES PROPERTIES AND SAMPLE DESIGN 38
3.2 TRANSPORT SPECTROSCOPY OF A SERIAL DOUBLE QD 39
3.3 CHARGE SENSING WITH A REMOTE SINGLE ELECTRON TRANSISTOR 42
3.4 PULSED GATE EXPERIMENTS 49
3.5 CONCLUSION 50
4 FIELD EFFECT CONTROL OF 2DES IN SI/SIGE HETEROSTRUCTURES 53
4.1 MEASUREMENT OF THE 2DES DENSITY AND MOBILITY 53
4.2 CAPACITIVE COUPLING BETWEEN GATE AND 2DES 57
4.2.1 DETERMINATION OF GATE-2DES CAPACITANCE 57
4.2.2 ERROR ANALYSIS 60
4.2.3 DISCUSSION 69
VII
HTTP://D-NB.INFO/1034991043
IMAGE 2
4.3 DETERMINATION OF TUNNEL RATES 71
4.4 HETEROSTRUCTURE SIMULATION 77
4.5 CONCLUSION 82
5 DISORDER ANALYSIS OF SI/SIGE 2DES 85
5.1 SCATTERING TIME ANALYSIS 86
5.1.1 THEORY AND MODEL 87
5.1.2 MOBILITY ANALYSIS 91
5.1.3 DISCUSSION 96
5.2 MAGNETO-TRANSPORT AT LOW MAGNETIC FIELDS 98
5.2.1 MAGNETO-RESISTANCE ANALYSIS 99
5.2.2 DINGLE ANALYSIS 101
5.2.3 DISCUSSION 102
5.3 CONCLUSION 102
6 DEVICE DEVELOPMENT AND OPTIMIZATION 105
6.1 LEAKAGE CURRENT ANALYSIS 106
6.1.1 LEAKAGE CURRENTS BETWEEN GATES AND 2DES 106
6.1.2 LEAKAGE CURRENTS BETWEEN DIFFERENT GATES 107
6.2 STRUCTURAL ANALYSIS 108
6.2.1 WAFER SURFACE 108
6.2.2 METALLIZATION 109
6.2.3 ETCHING PROCESS I L L
6.3 CONCLUSION 113
7 ORIGIN AND SUPPRESSION OF CHARGE NOISE IN A SI/SIGE 2DES 117
7.1 SAMPLE STRUCTURE 118
7.2 GATE HYSTERESIS 119
7.3 CHARGE NOISE 120
7.4 TUNNEL RATE ANALYSIS 122
7.5 NUMERICAL ANALYSIS OF CHARGE RECONFIGURATIONS 124
7.5.1 MODEL CALIBRATION 125
7.5.2 ORIGIN OF HYSTERESIS AND CHARGE NOISE 128
7.6 CONCLUSION 131
8 A FEW ELECTRON DOUBLE QUANTUM DOT IN A 28SI/SIGE 2DES 133
8.1 HETEROSTRUCTURE PROPERTIES 134
8.1.1 CHEMICAL AND ISOTOPICAL ANALYSIS 135
8.1.2 MOBILITY ANALYSIS 137
8.2 QUANTUM DOT CHARACTERIZATION 138
8.2.1 TRANSPORT SPECTROSCOPY OF A SINGLE QD 138
8.2.2 REMOTE CHARGE SENSING OF A DOUBLE QD 142
8.3 CONCLUSION 143
VIII
IMAGE 3
9 SUMMARY AND OUTLOOK 145
A HIGH BAND-WIDTH MAGNETO-TRANSPORT SETUP 151
A.L CIRCUIT MODEL 152
A.2 CIRCUIT ANALYSIS 154
A.3 HIGH BAND-WIDTH CIRCUIT MODEL 158
A.4 CONCLUSION 160
B ANOMALIES IN THE REGIME OF THE INTEGER AND FRACTIONAL QUANTUM HALL
EFFECT 161 B.L MEASUREMENT PROCEDURE 161
B.2 RESULTS 162
B.2.1 DOMINANCE OF FILLING FACTOR 2 162
B.2.2 AN APPARENT 7 / 2 FRACTIONAL QUANTUM HALL STATE 165
B.3 CONCLUSION 167
LIST OF ACRONYMS 169
LIST OF SYMBOLS 171
BIBLIOGRAPHY 173
LIST OF PUBLICATIONS 187
ACKNOWLEDGEMENTS 189
IX
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| author_facet | Wild, Andreas |
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| ctrlnum | (OCoLC)854724217 (DE-599)BVBBV041075789 |
| discipline | Physik |
| edition | 1. Aufl. |
| format | Thesis Book |
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| institution | BVB |
| isbn | 9783941650619 |
| language | English |
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| physical | VII, 191 S. Ill., graph. Darst. |
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| series2 | Selected Topics of Semiconductor Physics and Technology |
| spelling | Wild, Andreas Verfasser aut Development of a robust platform for spin qubits in SiGe heterostructures Andreas Wild 1. Aufl. Garching b. München Verein zur Förderung des Walter-Schottky-Inst. der Techn. Univ. München 2013 VII, 191 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Selected Topics of Semiconductor Physics and Technology Vol. 161 Zugl.: München, Techn. Univ., Diss., 2012 (DE-588)4113937-9 Hochschulschrift gnd-content Selected Topics of Semiconductor Physics and Technology Vol. 161 (DE-604)BV011499438 161 DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=026052677&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Wild, Andreas Development of a robust platform for spin qubits in SiGe heterostructures Selected Topics of Semiconductor Physics and Technology |
| subject_GND | (DE-588)4113937-9 |
| title | Development of a robust platform for spin qubits in SiGe heterostructures |
| title_auth | Development of a robust platform for spin qubits in SiGe heterostructures |
| title_exact_search | Development of a robust platform for spin qubits in SiGe heterostructures |
| title_full | Development of a robust platform for spin qubits in SiGe heterostructures Andreas Wild |
| title_fullStr | Development of a robust platform for spin qubits in SiGe heterostructures Andreas Wild |
| title_full_unstemmed | Development of a robust platform for spin qubits in SiGe heterostructures Andreas Wild |
| title_short | Development of a robust platform for spin qubits in SiGe heterostructures |
| title_sort | development of a robust platform for spin qubits in sige heterostructures |
| topic_facet | Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=026052677&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| volume_link | (DE-604)BV011499438 |
| work_keys_str_mv | AT wildandreas developmentofarobustplatformforspinqubitsinsigeheterostructures |