De Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) oscillations of the organic metal $θ$-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2) are studied in magnetic fields of up to 55 T at liquid helium temperatures. In line with Fermi surfaces (FS) illustrating the linear chain of coupled orbits, the observed Fourier components are linear combinations of the frequencies linked to the two basic orbits $α$ and $β$, which have small effective masses compared to other organic metals with the same FS topology. Analytical formulas based on a second order development of the free energy within the canonical ensemble, not only account for the field and temperature dependence of the dHvA amplitudes but also for their relative values. In addition, strongly non-Lifshitz-Kosevich behaviours are quantitatively interpreted. In contrast, Shubnikov-de Haas oscillations are not accounted for by this model. short title: Quantum oscillations of $θ$-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2)
Ambient-Pressure Organic Dirac Electron State in $α$-(BETS)$_2$AuCl$_2$
Graduate School of Science and Engineering, Saitama University（埼玉大学理工学研究科）；Research and Development Bureau, Saitama University（埼玉大学研发局）；Institute for Solid State Physics, University of Tokyo（东京大学固体物理研究所）
Shubnikov-de Haas effect and Yamaji oscillations in the antiferromagnetically ordered organic superconductor k-(BETS)2FeBr4: A Fermiology study
在有机超导体$κ$ -（BETS）$_2$ FeBr $_4$中观察到了Shubnikov-De Haas效应（SdH）和角相关磁电阻振荡（AMRO）。与其同构化合物$κ-(BETS)$ _2 $FeCl$ _4 $, SdH oscillations, for fields perpendicular to the conducting planes, reveal three Fermi Surface (FS) closed orbits $ α $, $ β $, and $ γ $ whose cross sectional areas are 19.8 %, 99.9 %, and 2.4 % of the first Brillouin zone, respectively. The conduction electron effective masses were found to be: $ μ_α =（4.7 \pm 0.2）$ m$ _e $, $ μ_β =（8.0 \pm 1.0）$ m$ _e $, and $ μ_γ =（2.0 \pm 0.2）$ m$ _e $. The observation of a $ γ $ orbit is not expected from band structure calculations, $ μ_β $ is …
Crystal structure, Fermi surface calculations and Shubnikov-de Haas oscillations spectrum of the organic metal $θ$-(BETS)$_4$HgBr$_4$(C$_6$H$_5$Cl) at low temperature
Observations of $ν=1$ Quantum Hall Effect and Inter-Band Effects of Magnetic fields on Hall Conductivity in Organic Massless Dirac Fermion System $α$-(BETS)$_2$I$_3$ under Pressure
本文在压力下的 α-(BETS)₂I₃ 有机无质量 Dirac 费米子体系中观测到 ν=1 量子 Hall 态，并通过化学势跨越 Dirac 点揭示了磁场对 Hall 电导率的带间效应。
Dynamics of ethylene groups and hyperfine interactions between donor and anion molecules in $λ$-type organic conductors studied by $^{69,71}$Ga-NMR spectroscopy
Gap opening mechanism for correlated Dirac electrons in organic compounds $α$-(BEDT-TTF)$_2$I$_3$ and $α$-(BEDT-TSeF)$_2$I$_3$
为了确定电子关联如何在有机化合物$α$ -（BEDT-TTF）$_2$ I $_3$ [ $α$ -（ET）$_2$ I $_3$ ]和$α$ -（BEDT-TSeF）$_2$ I $_3$ [ $α$ -（BETS）$_2$ I $_3$ ]中打开二维无质量狄拉克电子的能隙，我们推导并分析了这两种化合物的$ab$ $initio$低能有效哈密顿量。我们发现在$α$ -（ET）$_2$ I $_3$中，水平条纹电荷有序在无质量的狄拉克电子中打开了一个能隙，而在$α$ -（BETS）$_2$ I $_3$中出现了一个没有明显对称破缺的绝缘相.我们澄清了各向异性转移积分和电子相关性的组合引起自旋相关性的降维，即，一维自旋关联在$α$ -（BETS）$_2$ I $_3$中发展。我们证明了一维自旋关联在无质量的狄拉克电子中打开了一个能隙。我们的发现为利用强电子关联打开无质量狄拉克电子的能隙铺平了道路。
