Details
| Original language | English |
|---|---|
| Pages (from-to) | 260-263 |
| Number of pages | 4 |
| Journal | Physica B: Condensed Matter |
| Volume | 256-258 |
| Publication status | Published - 2 Dec 1998 |
Abstract
We have performed magneto-transport experiments on a high mobility 2DEG in a Si/SiGe heterojunction in tilted magnetic fields up to 26 T at temperatures down to 450 mK. When tilting the sample in the magnetic field the value of the spin splitting increases with respect to the Landau level splitting leading to an overlap of spin-split sub-levels of different Landau levels, the so-called coincidences. Coincidences between up to five neighbouring Landau levels are found. From their positions we deduce a Landé factor g* ≈ 3.4. Coincidences between the lowest Landau levels with fully resolved individual valley states show extremely high SdH peaks compared to the individual SdH maxima outside the coincidence suggesting strong exchange enhancement effects in the occurrence of the coincidence.
Keywords
- Coincidence measurements, Magneto-transport, Silicon-germanium, Valley splitting
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Electrical and Electronic Engineering
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In: Physica B: Condensed Matter, Vol. 256-258, 02.12.1998, p. 260-263.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Anomalous coincidences between valley split Landau levels in a Si/SiGe heterostructure
AU - Schumacher, H. W.
AU - Nauen, A.
AU - Zeitler, U.
AU - Haug, R. J.
AU - Weitz, P.
AU - Jansen, A. G.M.
AU - Schäffler, F.
PY - 1998/12/2
Y1 - 1998/12/2
N2 - We have performed magneto-transport experiments on a high mobility 2DEG in a Si/SiGe heterojunction in tilted magnetic fields up to 26 T at temperatures down to 450 mK. When tilting the sample in the magnetic field the value of the spin splitting increases with respect to the Landau level splitting leading to an overlap of spin-split sub-levels of different Landau levels, the so-called coincidences. Coincidences between up to five neighbouring Landau levels are found. From their positions we deduce a Landé factor g* ≈ 3.4. Coincidences between the lowest Landau levels with fully resolved individual valley states show extremely high SdH peaks compared to the individual SdH maxima outside the coincidence suggesting strong exchange enhancement effects in the occurrence of the coincidence.
AB - We have performed magneto-transport experiments on a high mobility 2DEG in a Si/SiGe heterojunction in tilted magnetic fields up to 26 T at temperatures down to 450 mK. When tilting the sample in the magnetic field the value of the spin splitting increases with respect to the Landau level splitting leading to an overlap of spin-split sub-levels of different Landau levels, the so-called coincidences. Coincidences between up to five neighbouring Landau levels are found. From their positions we deduce a Landé factor g* ≈ 3.4. Coincidences between the lowest Landau levels with fully resolved individual valley states show extremely high SdH peaks compared to the individual SdH maxima outside the coincidence suggesting strong exchange enhancement effects in the occurrence of the coincidence.
KW - Coincidence measurements
KW - Magneto-transport
KW - Silicon-germanium
KW - Valley splitting
UR - http://www.scopus.com/inward/record.url?scp=0348199607&partnerID=8YFLogxK
U2 - 10.1016/S0921-4526(98)00589-4
DO - 10.1016/S0921-4526(98)00589-4
M3 - Article
AN - SCOPUS:0348199607
VL - 256-258
SP - 260
EP - 263
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
ER -