Phys Rev Lett 2002, 88:256601.CrossRef 6. Abrahams E, Kravchenko SV, Sarachik MP: Metallic behavior and related phenomena in two dimensions. Rev Mod Phys 2001, 73:251.CrossRef 7. Nicholas RJ, Haug RJ, von Klitzing K, Weimann G: Go6983 price Exchange enhancement of the spin splitting in a GaAs-Ga x Al 1 – x As heterojunction. Phys Rev B 1988, 37:1294.CrossRef 8. Dolgopolov VT, Shashkin AA, Aristov AV, Schmerek D, Hansen W, Kotthaus JP, Holland M: Direct measurements of the spin gap in the two-dimensional electron gas of AlGaAs-GaAs heterojunctions. Phys Rev Lett 1997, 79:729.CrossRef Selleck AZD6738 9. Fang FF, Stiles PJ: Effects of a tilted magnetic field
on a two-dimensional electron gas. Phys Rev 1968, 174:823.CrossRef 10. Janak JF: g Factors for an interacting electron gas. Phys Rev 1969, 178:1416.CrossRef 11. Nicholas RJ, Haug RJ, von Klitzing K, Weimann G: Exchange enhancement of the spin splitting in a GaAs-Ga x Al 1 – x As heterojunction.
Phys Rev B 1988, 77:1294.CrossRef 12. Kim GH, Nicholls JT, Khondaker SI, Farrer I, Ritchie DA: Tuning the insulator-quantum Hall liquid transitions in a two-dimensional electron gas using self-assembled InAs. Phys Rev B 2000, 61:10910.CrossRef 13. Thomas KJ, Nicholls JT, Simmons MY, Pepper M, Mace DR, Ritchie DA: Possible spin polarization in a one-dimensional electron gas. Phys Rev Lett 1996, 77:135.CrossRef 14. Liang C-T, Lin L-H, Chen KY, Lo S-T, Wang Y-T, Lou D-S, Kim G-H, Chang YH, Ochiai Y, Aoki N, Chen JC, Lin Y, Huang CF, Lin S-D, Ritchie DA: AZD4547 mouse Selleck Ixazomib On the direct insulator-quantum Hall transition in two-dimensional electron systems in the vicinity of nanoscaled scatterers. Nanoscale Res Lett 2011, 6:131.CrossRef 15. Goldman VJ, Jain JK, Shayegan M: Nature of the extended states in the fractional quantum Hall effect. Phys Rev Lett 1990, 65:907.CrossRef 16. Glozman I, Johnson CE, Jiang HW: Fate of the delocalized states in a vanishing magnetic
field. Phys Rev Lett 1995, 74:594.CrossRef 17. Nomura S, Yamaguchi M, Akazaki T, Tamura H, Maruyama T, Miyashita S, Hirayama Y: Enhancement of electron and hole effective masses in back-gated GaAs/Al x Ga 1 – x As quantum wells. Phys Rev B 2007, 76:201306(R).CrossRef 18. Braña AF, Diaz-Paniagua C, Batallan F, Garrido JA, Muñoz E, Omnes F: Scattering times in AlGaN/GaN two-dimensional electron gas from magnetoresistance measurements. J Appl Phys 2000, 88:932.CrossRef 19. Cho KS, Huang T-Y, Huang CP, Chiu YH, Liang C-T, Chen YF, Lo I: Exchange-enhanced g-factors in an Al0.25Ga0.75N/GaN two-dimensional electron system. J Appl Phys 2004, 96:7370.CrossRef 20. Tutuc E, Melinte S, Shayegan M: Spin polarization and g factor of a dilute GaAs two-dimensional electron system. Phys Rev Lett 2002, 88:036805.CrossRef Competing interests The authors declare that they have no competing interests. Authors’ contributions TYH and CTL performed the measurements. CTL, YFC, and GHK coordinated the projects.