TY - JOUR
T1 - Crossed magnetic fields technique for studying spin and orbital properties of 2d electrons in the dilute regime
AU - Gershenson, M. E.
AU - Pudalov, V. M.
AU - Kojima, H.
AU - Butch, N.
AU - Dizhur, E. M.
AU - Brunthaler, G.
AU - Prinz, A.
AU - Bauer, G.
N1 - Funding Information:
Authors are grateful to E. Abrahams, B. Altshuler, and D. Maslov for discussions. The work was supported by the NSF, ARO MURI, NATO Scientific Program, RFBR, FWF, INTAS, and the Programs ‘Physics of Nanostructures’, ‘Statistical Physics’, ‘Integration’, and ‘The State Support of Leading Scientific Schools’.
PY - 2002/1
Y1 - 2002/1
N2 - We developed a crossed magnetic field 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 effective 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 × 1011 cm-2. We have also studied the effect of the in-plane magnetic field B∥ on dephasing. At high electron densities (n ≥2.5 × 1011 cm-2), the dephasing time τφ decreases with B∥ much stronger than the momentum relaxation time τ. At small n, on the contrary, the increase of the dephasing rate with B∥ is less than that for τ. In the latter case, the dependence τφ(B∥ can be attributed to enhancement of dephasing by the B∥-induced disorder.
AB - We developed a crossed magnetic field 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 effective 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 × 1011 cm-2. We have also studied the effect of the in-plane magnetic field B∥ on dephasing. At high electron densities (n ≥2.5 × 1011 cm-2), the dephasing time τφ decreases with B∥ much stronger than the momentum relaxation time τ. At small n, on the contrary, the increase of the dephasing rate with B∥ is less than that for τ. In the latter case, the dependence τφ(B∥ can be attributed to enhancement of dephasing by the B∥-induced disorder.
KW - Magnetoresistance
KW - Metal-insulator transition
KW - Two-dimensional electron gas
UR - http://www.scopus.com/inward/record.url?scp=0035239535&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035239535&partnerID=8YFLogxK
U2 - 10.1016/S1386-9477(01)00376-9
DO - 10.1016/S1386-9477(01)00376-9
M3 - Conference article
AN - SCOPUS:0035239535
SN - 1386-9477
VL - 12
SP - 585
EP - 590
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
IS - 1-4
T2 - 14th International Conference on the
Y2 - 30 July 2001 through 3 August 2001
ER -