Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd 1-x Mn x Te heterostructures:
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
2012
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| Schlagworte: | |
| Online-Zugang: | kostenfrei https://nbn-resolving.org/urn:nbn:de:bvb:355-epub-253964 Inhaltsverzeichnis |
| Beschreibung: | IV, 135 S. Ill., graph. Darst. |
Internformat
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| 245 | 1 | 0 | |a Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd 1-x Mn x Te heterostructures |c vorgelegt von Christian Betthausen |
| 246 | 1 | 3 | |a Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd1-xMnxTe heterostructures |
| 264 | 1 | |c 2012 | |
| 300 | |a IV, 135 S. |b Ill., graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 502 | |a Regensburg, Univ., Diss., 2012 | ||
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Datensatz im Suchindex
| _version_ | 1804149796780376064 |
|---|---|
| adam_text | IMAGE 1
CONTENTS
INTRODUCTION 1
1 MATERIAL PROPERTIES OF CDTE AND CDMNTE 3
1.1 CRYSTAL STRUCTURE 3
1.2 BAND STRUCTURE IN ABSENCE OF A MAGNETIC FIELD 5
1.3 MAGNETIC PROPERTIES 8
2 THEORETICAL BACKGROUND 13
2.1 CHARGE CARRIERS IN TWO DIMENSIONS 13
2.1.1 IMPLEMENTATION 13
2.1.2 QUANTUM MECHANICAL DESCRIPTION 15
2.1.3 SCATTERING MECHANISMS 15
2.1.4 LOW-FIELD MAGNETOTRANSPORT 17
2.2 QUANTUM HALL EFFECTS: INTEGER AND FRACTIONAL 18
2.2.1 LANDAU QUANTIZATION 18
2.2.2 INTEGER QUANTUM HALL EFFECT 19
2.2.3 FRACTIONAL QUANTUM HALL EFFECT . 21
2.3 SP-D EXCHANGE INTERACTION 26
2.3.1 EXCHANGE HAMILTONIAN 26
2.3.2 EIGENENERGIES OF A PARABOLIC CONDUCTION BAND 28
2.3.3 IMPACT ON MAGNETOTRANSPORT 30
2.4 MODULATED STRUCTURES 32
2.4.1 EXPERIMENTAL FINDINGS 32
2.4.2 THEORY - AT A GLANCE 34
3 SAMPLE PREPARATION AND EXPERIMENTAL SETUP 37
3.1 SAMPLE PREPARATION 37
3.1.1 WAFER MATERIAL 37
3.1.2 LITHOGRAPHY AND STRUCTURING 40
3.1.3 SAMPLE DESIGN . . 43
3.1.4 OHMIC CONTACTS 45
3.2 EXPERIMENTAL SETUP 49
3.2.1 DILUTION REFRIGERATION 49
3.2.2 ELECTRONICS 51
III
HTTP://D-NB.INFO/1031256113
IMAGE 2
CONTENTS
4 FRACTIONAL QUANTUM HALL EFFECT IN CDTE AND CDMNTE 55
4.1 FQHE IN CDTE 55
4.2 FQHE IN CDMNTE 60
4.2.1 SETUP AND MATERIAL PARAMETERS 61
4.2.2 COMPOSITE FERMIONS IN A DILUTED MAGNETIC SEMICONDUCTOR 66 4.3
SUMMARY - FQHE IN CDTE AND CDMNTE 77
5 SPIN TRANSISTOR ACTION VIA TUNABLE ADIABATICITY 79
5.1 INITIAL CONSIDERATIONS 79
5.2 EVIDENCE OF SPIN TRANSISTOR ACTION 84
5.2.1 SETUP AND FIRST EXPERIMENTS 85
5.2.2 TOWARDS A SPIN TRANSISTOR 89
5.3 BLOCKING OF SPIN TRANSMISSION 93
5.3.1 THE ADIABATIC THEOREM OF QUANTUM MECHANICS 94
5.3.2 BALLISTIC MODEL 96
5.3.3 TRANSPORT CALCULATIONS 99
5.3.4 NON-HELICAL STRAY FIELDS 103
5.3.5 DEVICE PERFORMANCE 107
5.4 ADDITIONAL EXPERIMENTS 110
5.4.1 RANDOM STRAY FIELDS AND DEMAGNETIZED STRIPES 110 5.4.2 IRON STRIPE
GRATINGS 113
5.5 SUMMARY - SPIN TRANSISTOR ACTION 115
6 CONCLUSIONS 117
APPENDIX 121
BIBLIOGRAPHY 125
LIST OF PUBLICATIONS 133
IV
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| spelling | Betthausen, Christian Verfasser aut Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd 1-x Mn x Te heterostructures vorgelegt von Christian Betthausen Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd1-xMnxTe heterostructures 2012 IV, 135 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Regensburg, Univ., Diss., 2012 Magnetowiderstand (DE-588)4221121-9 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Magnetowiderstand (DE-588)4221121-9 s DE-604 Erscheint auch als Online-Ausgabe urn:nbn:de:bvb:355-epub-253964 http://epub.uni-regensburg.de/25396/ Verlag kostenfrei Volltext https://nbn-resolving.org/urn:nbn:de:bvb:355-epub-253964 Resolving-System DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=025496205&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Betthausen, Christian Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd 1-x Mn x Te heterostructures Magnetowiderstand (DE-588)4221121-9 gnd |
| subject_GND | (DE-588)4221121-9 (DE-588)4113937-9 |
| title | Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd 1-x Mn x Te heterostructures |
| title_alt | Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd1-xMnxTe heterostructures |
| title_auth | Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd 1-x Mn x Te heterostructures |
| title_exact_search | Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd 1-x Mn x Te heterostructures |
| title_full | Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd 1-x Mn x Te heterostructures vorgelegt von Christian Betthausen |
| title_fullStr | Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd 1-x Mn x Te heterostructures vorgelegt von Christian Betthausen |
| title_full_unstemmed | Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd 1-x Mn x Te heterostructures vorgelegt von Christian Betthausen |
| title_short | Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd 1-x Mn x Te heterostructures |
| title_sort | spin effects in high and low field magnetotransport experiments in semimagnetic cd 1 x mn x te heterostructures |
| topic | Magnetowiderstand (DE-588)4221121-9 gnd |
| topic_facet | Magnetowiderstand Hochschulschrift |
| url | http://epub.uni-regensburg.de/25396/ https://nbn-resolving.org/urn:nbn:de:bvb:355-epub-253964 http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=025496205&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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