[1] Esaki L, Tsu R. IBM J. Res. and Development, 1970, 14: 61.
[2] Kondo Y, Ono M, Matsuzaka S, et al. Phys. Rev. Lett., 2008, 101: 207601.
[3] Feng W, Kuryatkov V V, Chandolu A, et al. J. Appl. Phys., 2008, 104: 103530.
[4] Nikiforov A Yu, Cargill III G S, Guo S P, et al. J. Appl. Phys., 2008, 104: 114506.
[5] Genest J, Béal R, Aimez V, et al. Appl. Phys. Lett., 2008, 93: 071106.
[6] So F F, Forrest S R, Shi Y Q, et al. Appl. Phys. Lett., 1990, 56: 674.
[8] Ohmori Y, Fujii A, Uchida M, et al. Appl. Phys. Lett., 1993, 63: 1871.
[9] Fujita S, Nakazawa T, Asano M, et al. Jpn. J. Appl. Phys., 2000, 39: 5301.
[10] Huang Jinzhao, Xu Zheng, Zhao Suling, et al. Syn. Met., 2007, 157: 739.
[11] Fujii A, Ohmori Y, Morisishima C, et al. Jpn. J. Appl. Phys., 1994, 33: 348.
[12] Baek H, Lee C. J. Appl. Phys., 2008, 103: 054510.
[13] Tse S C, Tsung K K, So S K. Appl. Phys. Lett., 2007, 90: 13502.