Crossed magnetic fields technique for studying spin and orbital properties of 2d electrons in the dilute regime
✍ Scribed by M.E. Gershenson; V.M. Pudalov; H. Kojima; N. Butch; E.M. Dizhur; G. Brunthaler; A. Prinz; G. Bauer
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 294 KB
- Volume
- 12
- Category
- Article
- ISSN
- 1386-9477
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✦ Synopsis
We developed a crossed magnetic ÿeld technique, which allowed us to probe separately the spin and orbital properties of two-dimensional (2D) electrons. Using this technique, we measured directly the spin susceptibility, the e ective electron mass and g-factor in diluted 2D systems near the metal-insulator transition. All these quantities increase gradually with decreasing electron density: e.g., the susceptibility increases by a factor of 4 at n 1 × 10 11 cm -2 . We have also studied the e ect of the in-plane magnetic ÿeld B || on dephasing. At high electron densities (n ¿ 2:5 × 10 11 cm -2 ), the dephasing time ' decreases with B || much stronger than the momentum relaxation time . At small n, on the contrary, the increase of the dephasing rate with B || is less than that for . In the latter case, the dependence '(B||) can be attributed to enhancement of dephasing by the B || -induced disorder.