CR measurement of Dirac-cone state realized in 2D organic conductor under high pressure

本研究的目的是获得Suzumura群理论所预言的在高于1.5 Gpa的高压下二维导体中Dirac锥卫星存在的直接实验证据。狄拉克锥态是凝聚态物理学中的一个新概念，有望在高压下实现。然而，为了对其进行直接观测，我们开发了包括压力室在内的新系统，因为测量需要在高压、低温和强磁场等多个极端条件下对电磁波进行吸收测量，因此可以在太赫兹区域传输电磁波。研制成功了1.5 GPa4.2K 10T、400 GHz以上频率下的测量系统。目前，我们已经能够进行直接测量，并有望在不久的将来得到结果。

The aim of this study is to get the direct experimental evidence of Dirac cone satae in 2 dimensional conductor under high pressure beyond 1.5 GPa, which is predicted by the theory of Suzumura group. The Dirac cone state, which is expected to realize under high pressure, is the new concept in condensed matter physics. However, in order to make the direct observation of it, we developed the new system including the development of pressure cell, which enables the transmission of electro-magnetic wave in the THz region because the measurement requires the absorption measurement of the electro-magnetic wave under multi-extreme conditions, such as high pressure, low temperature and high magnetic field. We have succeeded in developing the system which enables the measurement under 1.5 GPa, 4.2K, 10T and frequency beyond 400 GHz. Now we are in the position to make the direct measurement, and the result is expected in near future.