Effects of magnetic field in organic conductors with relativistic electrons

我们首次在有机导体α-(BEDT-TTf)_2I_3中发现了高压下的大块无质量狄拉克费米子系统。其中一个特征是零模朗道能级总是存在于磁场中的零能级。在这项工作中，我们成功地检测了零模及其自旋分裂对层间输运的影响。最令人印象深刻的发现是在Θ-(BEDT-TTf)_2I_3中实现了同时含有狄拉克粒子和正常电子的多能带狄拉克费米子系统。

We have discovered first bulk massless Dirac fermion systems in an organic conductor α-(BEDT-TTF)_2I_3under high pressure. One of the characteristic feature is that the zero-mode Landau level always exist at the zero-energy in magnetic field. In this work, we succeeded in detecting the effects of zero-mode including its spin splitting on inter-layer transport. The most impressive findings are that the multi-band Dirac fermion systems with both Dirac particles and normal electrons are realized in Θ-(BEDT-TTF)_2I_3.