Transport of two-dimensional electrons through magnetic barriers: [an investigation of two-dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets]
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Buch |
| Sprache: | English |
| Veröffentlicht: |
Berlin
Logos-Verl.
2001
|
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | Zugl.: Nottingham, Univ., Diss., 2001 |
| Beschreibung: | VIII, 200 S. graph. Darst. : 21 cm |
| ISBN: | 389722707X |
Internformat
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| 035 | |a (OCoLC)50523904 | ||
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| 100 | 1 | |a Kubrak, Volker |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Transport of two-dimensional electrons through magnetic barriers |b [an investigation of two-dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets] |c by Volker Kubrak |
| 264 | 1 | |a Berlin |b Logos-Verl. |c 2001 | |
| 300 | |a VIII, 200 S. |b graph. Darst. : 21 cm | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 500 | |a Zugl.: Nottingham, Univ., Diss., 2001 | ||
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| 943 | 1 | |a oai:aleph.bib-bvb.de:BVB01-009461246 | |
Datensatz im Suchindex
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| adam_text |
CONTENTS
ABSTRACT
.
VI
ACKNOWLEDGEMENTS
.
VII
OWN
PUBLICATIONS
.VIII
1
INTRODUCTION
1
1.1
MOTIVATION
.
1
1.2
MAGNETIC
BARRIERS
.
2
1.2.1
DEFINITION
OF
BARRIER
TYPES
.
4
1.2.2
PRINCIPLE
OF
BARRIER
ACTION
.
5
1.2.2.1
SEMI-CLASSICAL
PICTURE
.
5
1.2.2.2
TRANSMISSION
VERSUS
BARRIER
AMPLITUDE
-
DEFINITION
OF
TRANSPARENT
AND
OPAQUE
.
8
1.2.2.3
QUANTUM
PICTURE
.
9
1.2.3
DEFINITION
OF
BARRIER
RESISTANCE
AND
CONDUCTANCE
.
11
1.3
GUIDE
TO
THIS
THESIS
.
12
1.3.1
CHAPTER
BY
CHAPTER
.
12
1.3.2
HIGHLIGHTS
AND
SECTIONS
RELEVANT
TO
APPLICATIONS
.
14
2
BACKGROUND
THEORY
15
2.1
ELECTRONIC
TRANSPORT
IN
TWO-DIMENSIONAL
ELECTRON
GASES
.
15
2.1.1
FORMATION
OF
A
2DEG
AT
A
HETERO-INTERFACE
.
16
2.1.2
DIFFUSIVE
TRANSPORT
.
20
2.1.2.1
KUBO
FORMULA
FOR
THE
CONDUCTIVITY
OF
A
2DEG
.
21
2.1.2.2
DIFFUSIVE
TRANSPORT
IN
A
MAGNETIC
FIELD
.
23
2.1.3
BALLISTIC
TRANSPORT
.
24
2.1.3.1
LANDAUER
FORMULA
FOR
WIDE
CHANNELS
.
26
2.1.4
SEMI-BALLISTIC
TRANSPORT
.
27
2.1.5
EDGE
STATES
AND
THE
INTEGER
QUANTUM
HALL
EFFECT
.
29
2.2
MAGNETIC
PROPERTIES
OF
MICROSTRUCTURED
FERROMAGNETS
.
31
2.2.1
SHAPE
ANISOTROPY
OF
MICROSTRUCTURED
ELEMENTS
.
32
2.2.2
STONER-WOHLFARTH
MODEL
FOR
SINGLE-DOMAIN
PARTICLES
.
36
2.2.3
OTHER
MODES
FOR
MAGNETIZATION
REVERSAL
.
40
2.2.4
DOMAIN
STRUCTURES
.
42
IV
CONTENTS
3
SAMPLE
DESIGN
AND
FABRICATION
45
3.1
BARRIER
FIELD
PROFILES
.
46
3.1.1
SIMPLE
BARRIERS
FROM
RECTANGULAR
ELEMENTS
.
48
3.1.2
SIGN-ALTERNATING
BARRIERS
FROM
NARROW
STRIPES
.
50
3.1.3
BARRIERS
FROM
ARRAYS
OF
STRIPES
.
51
3.1.4
OTHER
EFFECTS
OF
THE
MAGNETIC
ELEMENTS
ON
THE
2DEG
.
51
3.2
WAFERS
.
54
3.3
SAMPLE
FABRICATION
.
56
3.3.1
PROCESSING
INTO
HALL
BARS
.
56
3.3.2
FABRICATION
OF
THE
MAGNETIC
ELEMENTS
.
57
4
TRANSPORT
THROUGH
A
SIMPLE
MAGNETIC
BARRIER
59
4.1
BARRIER
RESISTANCES
.
60
4.1.1
DEFINITION
OF
BARRIER
RESISTANCE
AND
CONDUCTANCE
.
63
4.1.2
BARRIER
RESISTANCE
AND
CONDUCTANCE
OF
A
D
=
270
NM
BARRIER
.
64
4.1.2.1
CONSIDERATION
OF
EFFECTS
DUE
TO
DEVIATIONS
FROM
THE
IDEAL
FIELD
PROFILE
.
66
4.1.3
BARRIER
RESISTANCE
AND
CONDUCTANCE
OF
A
D
=
600
NM
BARRIER
.
70
4.1.3.1
BARRIER
RESISTANCE
AT
ROOM
TEMPERATURE
.
71
4.1.4
BARRIER
RESISTANCE
OF
A
D
=
100
NM
BARRIER
.
74
4.2
DETERMINING
THE
BARRIER
AMPLITUDE
WITH
THE
LOCAL
HALL
EFFECT
.
77
4.3
BARRIER
RESISTANCE
VERSUS
BARRIER
AMPLITUDE
.
81
4.4
THEORY
FOR
THE
TRANSMISSION
THROUGH
MAGNETIC
BARRIERS
.
83
4.4.1
CLASSICAL
BALLISTIC
THEORY
FOR
THE
BARRIER
RESISTANCE
.
83
4.4.2
SCATTERING-ASSISTED
TRANSMISSION
.
85
4.4.3
TRANSMISSION
BY
SKIPPING
ALONG
THE
EDGES
.
91
4.4.4
RESULTS
FOR
SPECIFIC
SAMPLES
.
94
4.4.4.1
SIMULATION
OF
THE
D
=
270
NM
DEVICE
.
94
4.4.4.2
SIMULATION
OF
THE
D
=
600
NM
DEVICE
.
98
4.4.4.3
SIMULATION
OF
THE
D
=
100
NM
DEVICE
.
99
4.4.5
REVIEW
OF
THE
DIFFUSIVE
THEORY
.
100
4.5
EVIDENCE
FOR
CONDUCTANCE
QUANTIZATION
IN
OPAQUE
BARRIERS
.
104
5
TRANSPORT
THROUGH
A
SIGN-ALTERNATING
MAGNETIC
BARRIER
111
5.1
BARRIER
RESISTANCES
.
113
5.1.1
BARRIER
RESISTANCE
OF
AN
A
=
200
NM
BARRIER
.
113
5.1.2
BARRIER
RESISTANCE
OF
AN
A
=
400
NM
BARRIER
.
117
5.1.3
BARRIER
RESISTANCE
OF
AN
A
=
1700
NM
BARRIER
.
118
5.2
THEORY
FOR
THE
TRANSPORT
THROUGH
SIGN-ALTERNATING
BARRIERS
.
121
5.2.1
SNAKE
ORBITS
.
123
5.2.2
BALLISTIC
AND
SEMI-BALLISTIC
TRANSMISSION
.
125
5.2.3
DIFFUSIVE
THEORY
FOR
THE
BARRIER
RESISTANCE
DUE
TO
THE
PRESENCE
OF
SNAKE
ORBITS
.
130
5.2.4
COMPARISON
WITH
EXPERIMENT
AND
DISCUSSION
.
134
5.3
MAGNETIZATION
CURVES
INDUCED
FROM
THE
BARRIER
RESISTANCE
.
135
CONTENTS
V
5.4
MAGNETIZATION
REVERSAL
IN
NARROW
CO
STRIPES
.
139
6
TRANSPORT
THROUGH
ARRAYS
OF
SIGN-ALTERNATING
BARRIERS
147
6.1
MAGNETORESISTANCE
DUE
TO
PERIODIC
AND
APERIODIC
GRATINGS
.
149
6.2
RESISTANCE
DUE
TO
A
FINITE
ARRAY
OF
BARRIERS
.
152
6.3
DIFFUSIVE
THEORY
FOR
THE
MR
DUE
TO
GRATINGS
.
157
6.4
DISCUSSION
OF
A
POSSIBLE
MR
CONTRIBUTION
BY
ELECTRON-ELECTRON
SCAT
TERING
.
167
7
CONCLUSION
173
7.1
SUMMARY
.
173
7.2
OUTLOOK
.
175
APPENDIX
177
A
EXPERIMENTAL
TECHNIQUES
177
A.L
CRYO-MAGNETIC
SYSTEMS
.
178
A.1.1
4
HE
CRYOSTAT
WITH
EXTERNAL
MAGNET
.
178
A.1.2
4
HE
CRYOSTAT
WITH
SUPERCONDUCTING
MAGNET
.
179
A.1.3
3
HE
CRYOSTAT
WITH
SUPERCONDUCTING
MAGNET
.
180
A.
1.4
DILUTION
REFRIGERATOR
WITH
SUPERCONDUCTING
MAGNET
.
180
A.2
RESISTANCE
MEASUREMENTS
.
180
A.2.1
RESISTANCE
BRIDGE
.
180
A.2.2 LOCK-IN
AMPLIFIERS
.
181
B
UNITS
OF
MAGNETIC
QUANTITIES
183
C
LIST
OF
SYMBOLS
185
BIBLIOGRAPHY
189 |
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| author_sort | Kubrak, Volker |
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| bvnumber | BV013832996 |
| ctrlnum | (OCoLC)50523904 (DE-599)BVBBV013832996 |
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| genre | (DE-588)4113937-9 Hochschulschrift gnd-content |
| genre_facet | Hochschulschrift |
| id | DE-604.BV013832996 |
| illustrated | Illustrated |
| indexdate | 2025-03-10T11:09:23Z |
| institution | BVB |
| isbn | 389722707X |
| language | English |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-009461246 |
| oclc_num | 50523904 |
| open_access_boolean | |
| owner | DE-355 DE-BY-UBR |
| owner_facet | DE-355 DE-BY-UBR |
| physical | VIII, 200 S. graph. Darst. : 21 cm |
| publishDate | 2001 |
| publishDateSearch | 2001 |
| publishDateSort | 2001 |
| publisher | Logos-Verl. |
| record_format | marc |
| spelling | Kubrak, Volker Verfasser aut Transport of two-dimensional electrons through magnetic barriers [an investigation of two-dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets] by Volker Kubrak Berlin Logos-Verl. 2001 VIII, 200 S. graph. Darst. : 21 cm txt rdacontent n rdamedia nc rdacarrier Zugl.: Nottingham, Univ., Diss., 2001 Elektronengas (DE-588)4151870-6 gnd rswk-swf Inhomogenes Feld (DE-588)4402990-1 gnd rswk-swf Magnetfeld (DE-588)4074450-4 gnd rswk-swf Dimension 2 (DE-588)4321721-7 gnd rswk-swf Galliumarsenid (DE-588)4019155-2 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Galliumarsenid (DE-588)4019155-2 s Elektronengas (DE-588)4151870-6 s Dimension 2 (DE-588)4321721-7 s Magnetfeld (DE-588)4074450-4 s Inhomogenes Feld (DE-588)4402990-1 s DE-604 DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=009461246&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Kubrak, Volker Transport of two-dimensional electrons through magnetic barriers [an investigation of two-dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets] Elektronengas (DE-588)4151870-6 gnd Inhomogenes Feld (DE-588)4402990-1 gnd Magnetfeld (DE-588)4074450-4 gnd Dimension 2 (DE-588)4321721-7 gnd Galliumarsenid (DE-588)4019155-2 gnd |
| subject_GND | (DE-588)4151870-6 (DE-588)4402990-1 (DE-588)4074450-4 (DE-588)4321721-7 (DE-588)4019155-2 (DE-588)4113937-9 |
| title | Transport of two-dimensional electrons through magnetic barriers [an investigation of two-dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets] |
| title_auth | Transport of two-dimensional electrons through magnetic barriers [an investigation of two-dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets] |
| title_exact_search | Transport of two-dimensional electrons through magnetic barriers [an investigation of two-dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets] |
| title_full | Transport of two-dimensional electrons through magnetic barriers [an investigation of two-dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets] by Volker Kubrak |
| title_fullStr | Transport of two-dimensional electrons through magnetic barriers [an investigation of two-dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets] by Volker Kubrak |
| title_full_unstemmed | Transport of two-dimensional electrons through magnetic barriers [an investigation of two-dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets] by Volker Kubrak |
| title_short | Transport of two-dimensional electrons through magnetic barriers |
| title_sort | transport of two dimensional electrons through magnetic barriers an investigation of two dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets |
| title_sub | [an investigation of two-dimensional electron gases in spatielly inhomogeneous magnetic fields produced by microstructured ferromagnets] |
| topic | Elektronengas (DE-588)4151870-6 gnd Inhomogenes Feld (DE-588)4402990-1 gnd Magnetfeld (DE-588)4074450-4 gnd Dimension 2 (DE-588)4321721-7 gnd Galliumarsenid (DE-588)4019155-2 gnd |
| topic_facet | Elektronengas Inhomogenes Feld Magnetfeld Dimension 2 Galliumarsenid Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=009461246&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| work_keys_str_mv | AT kubrakvolker transportoftwodimensionalelectronsthroughmagneticbarriersaninvestigationoftwodimensionalelectrongasesinspatiellyinhomogeneousmagneticfieldsproducedbymicrostructuredferromagnets |