论文标题
二维补偿金属中Lifshitz过渡附近的De Haas-Van Alphen振荡的3/2和5/2频率的增强
Enhancements of the 3/2 and 5/2 frequencies of de Haas-van Alphen oscillations near the Lifshitz transition in the two-dimensional compensated metal with overtilted Dirac cones
论文作者
论文摘要
我们研究了二维补偿金属中的de haas-van alphen（DHVA）振荡，在Lifshitz过渡附近，狄拉克锥有过二的狄拉克锥。我们采用$α$ - （bedt-ttf）$ _ 2 $ i $ _3 $的紧密结合模型，其中实现了无质量的狄拉克费米子。当沿$ y $轴的单轴压力$（p）$以上的$ p \ simeq 0.2 $ kbar中的$α$ - （bedt-tttf）$ _ 2 $ _ 2 $ i $ _3 $，一个电子口袋，一个电子口袋，它封闭了越过的狄拉克点，将两个电子口袋更改为两个电子准子，即toles。我们表明，在LIFSHITZ过渡发生的压力区域中，孔口袋的$ 3/2 $和$ 5/2 $区域的傅立叶组件异常增强。在Lifshitz过渡附近的二维过时的Dirac费米子中，将观察到这种现象。
We study the de Haas-van Alphen (dHvA) oscillations in the two-dimensional compensated metal with overtilted Dirac cones near the Lifshitz transition. We employ the tight-binding model of $α$-(BEDT-TTF)$_2$I$_3$, in which the massless Dirac fermions are realized. When a uniaxial pressure $(P)$ along the $y$-axis is applied above $P\simeq 0.2$ kbar in $α$-(BEDT-TTF)$_2$I$_3$, one electron pocket, which encloses the overtilted Dirac points, is changed to two electron pockets, i.e., Lifshitz transition happens, while a hole pocket does not change a topology. We show that the Fourier components corresponding to the $3/2$ and $5/2$ areas of the hole pocket are anomalously enhanced in the region of pressure where the Lifshitz transition occurs. This phenomenon will be observed in the two-dimensional overtilted Dirac fermions near the Lifshitz transition.
