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New Environment for a Two-Dimensional Topological Insulator with Hexagonal Channels Hosting Diiodido-bismuthate(I) Anions in a Singlet State
Chemistry of Materials ( IF 7.2 ) Pub Date : 2016-01-14 00:00:00 , DOI: 10.1021/acs.chemmater.5b04496 Bertold Rasche 1 , Wouter Van den Broek 2 , Michael Ruck 1, 3
Chemistry of Materials ( IF 7.2 ) Pub Date : 2016-01-14 00:00:00 , DOI: 10.1021/acs.chemmater.5b04496 Bertold Rasche 1 , Wouter Van den Broek 2 , Michael Ruck 1, 3
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A honeycomb layer of transition metal-centered bismuth cubes has attracted attention as part of the weak topological insulator (TI) Bi14Rh3I9. The intermetallic layer itself is a two-dimensional TI and has been found in Bi13Pt3I7 and Bi12Pt3I5, as well as in the new material Bi38Pt9I14, yet with different stacking sequences and types of insulating spacer layers in all cases. The arrangements strongly influence the electronic situation, especially the coupling between the TI layers. X-ray diffraction and electron microscopy show that in Bi38Pt9I14 the intermetallic layers are exclusively separated by single layers of iodide ions. The eclipsed stacking of the honeycomb layers results in hexagonal channels. These host hitherto unknown linear [BiI2]− anions with bismuth atoms in the uncommon +I oxidation state. Quantum chemical calculations as well as magnetic susceptibility data indicate a singlet state stabilized by strong spin–orbit coupling. Bi38Pt9I14 is a semiconductor with a very narrow energy gap, as resistivity measurements show. The nontrivial topological invariants of the electronic bands at the Fermi energy and the coupling of TI layers throughout the crystal suggest even a strong TI.
中文翻译：
具有单峰态二碘代-铋（I）阴离子的六边形通道的二维拓扑绝缘子的新环境
作为弱拓扑绝缘体（TI）Bi 14 Rh 3 I 9的一部分，以过渡金属为中心的铋立方体的蜂窝层引起了人们的注意。金属间层本身是二维的TI，已在Bi 13 Pt 3 I 7和Bi 12 Pt 3 I 5以及新材料Bi 38 Pt 9 I 14中发现，但在所有情况下都具有不同的堆叠顺序和绝缘间隔层的类型。这些布置强烈影响电子状况，尤其是TI层之间的耦合。X射线衍射和电子显微镜显示，在Bi 38 Pt 9 I 14中，金属间层仅被碘离子的单层隔开。蜂窝层的黯淡堆叠会形成六边形通道。这些宿主具有迄今未知的线性铋离子[BiI 2 ] -，其铋原子处于罕见的+ I氧化态。量子化学计算以及磁化率数据表明，单峰态通过强自旋-轨道耦合而稳定。双38的Pt 9如电阻率测量所示，I 14是具有非常窄的能隙的半导体。电子带在费米能量处的非平凡拓扑不变性以及整个晶体中TI层的耦合都表明，即使是强TI也是如此。
更新日期：2016-01-14
中文翻译：
具有单峰态二碘代-铋（I）阴离子的六边形通道的二维拓扑绝缘子的新环境
作为弱拓扑绝缘体（TI）Bi 14 Rh 3 I 9的一部分，以过渡金属为中心的铋立方体的蜂窝层引起了人们的注意。金属间层本身是二维的TI，已在Bi 13 Pt 3 I 7和Bi 12 Pt 3 I 5以及新材料Bi 38 Pt 9 I 14中发现，但在所有情况下都具有不同的堆叠顺序和绝缘间隔层的类型。这些布置强烈影响电子状况，尤其是TI层之间的耦合。X射线衍射和电子显微镜显示，在Bi 38 Pt 9 I 14中，金属间层仅被碘离子的单层隔开。蜂窝层的黯淡堆叠会形成六边形通道。这些宿主具有迄今未知的线性铋离子[BiI 2 ] -，其铋原子处于罕见的+ I氧化态。量子化学计算以及磁化率数据表明，单峰态通过强自旋-轨道耦合而稳定。双38的Pt 9如电阻率测量所示，I 14是具有非常窄的能隙的半导体。电子带在费米能量处的非平凡拓扑不变性以及整个晶体中TI层的耦合都表明，即使是强TI也是如此。
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