Linear scanning tunneling spectroscopy over a large energy range in black phosphorus
Linear scanning tunneling spectroscopy over a large energy range in black phosphorus
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黑磷大能量范围内的线性扫描隧道光谱
DOI：
10.1063/1.5029571
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发表时间：
2018-07
影响因子：
3.2
通讯作者：
Feng Min
中科院分区：
文献类型：
--
作者：
Guo Hongli;Cui Xingxia;Zhou Weiqing;Han Ding;Lin Chungwei;Cao Limin;Feng Min
通过低温扫描隧道显微镜/光谱技术（STM/STS）、密度泛函理论计算、解析拟合和模型模拟等手段，揭示了黑磷（BP）导电带（CB）的独特电子特性。我们发现表征BP局域态密度（LDOS）的微分电导谱在未占据电子态区域的大能量范围内呈现线性特征。结合理论计算，我们证明了导带最小值上方的线性特性源于BP的CB各向异性频带色散的特定组合。特别是BP的CB波函数在BP层之间具有明显的密度，并且向真空中延伸明显，这与相邻波段的波函数形成鲜明对比。这使得即使在能量足够高而涉及其他频段时，CB也能主导STS信号，并在很宽的能量范围内保持STS频谱的线性。CB在BP中间层中提供线性DOS并具有明显的波函数密度，这一事实为BP和BP基材料的电子结构和性能的工程设计提供了新的见解。通过低温扫描隧道显微镜/光谱技术（STM/STS）、密度泛函理论计算、解析拟合和模型模拟等手段，揭示了黑磷（BP）导电带（CB）的独特电子特性。我们发现表征BP局域态密度（LDOS）的微分电导谱在未占据电子态区域的大能量范围内呈现线性特征。结合理论计算，我们证明了导带最小值上方的线性特性源于BP的CB各向异性频带色散的特定组合。特别是BP的CB波函数在BP层之间具有明显的密度，并且向真空中延伸明显，这与相邻波段的波函数形成鲜明对比。这使得CB即使在能量足够高而涉及其他频段时也能主导STS信号，并保持STS规格的线性。
We reveal the unique electronic characteristics of the conduction band (CB) of black phosphorus (BP) by combining low-temperature scanning tunneling microscopy/spectroscopy (STM/STS), density functional theory calculations, analytic fitting, and model simulations. We discover that the differential conductance spectrum, which represents the local density of states (LDOS) of BP, exhibits a linear character over a large energy range in the unoccupied electronic state region. Combining theoretical calculations, we demonstrate that the linear character right above the conduction band minimum originates from a specific combination of the anisotropic band dispersions of BP's CB. In particular, the wave function of BP's CB possesses a pronounced density between BP layers and extends into the vacuum significantly, which is in sharp contrast to those of adjacent bands. This makes the CB dominate STS signals even when the energy is sufficiently high to involve other bands, and maintains the linearity of the STS spectrum over a wide energy range. The fact that the CB provides linear DOS and possesses pronounced wave function density in BP interlayers provides new insights for engineering the electronic structures and properties of BP and BP based materials.We reveal the unique electronic characteristics of the conduction band (CB) of black phosphorus (BP) by combining low-temperature scanning tunneling microscopy/spectroscopy (STM/STS), density functional theory calculations, analytic fitting, and model simulations. We discover that the differential conductance spectrum, which represents the local density of states (LDOS) of BP, exhibits a linear character over a large energy range in the unoccupied electronic state region. Combining theoretical calculations, we demonstrate that the linear character right above the conduction band minimum originates from a specific combination of the anisotropic band dispersions of BP's CB. In particular, the wave function of BP's CB possesses a pronounced density between BP layers and extends into the vacuum significantly, which is in sharp contrast to those of adjacent bands. This makes the CB dominate STS signals even when the energy is sufficiently high to involve other bands, and maintains the linearity of the STS spec...
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影响因子：
3.7
作者：
Kresse, G;Furthmuller, J
通讯作者：
Furthmuller, J
影响因子：
3.2
作者：
J. Riffle;C. Flynn;B. S. Laurent;C. Ayotte;C. Caputo;S. Hollen
通讯作者：
J. Riffle;C. Flynn;B. S. Laurent;C. Ayotte;C. Caputo;S. Hollen
DOI：
--
发表时间：
2010
期刊：
Journal of Physics: Condensed Matter
影响因子：
--
作者：
J. Klimeš;D. Bowler;A. Michaelides
通讯作者：
J. Klimeš;D. Bowler;A. Michaelides
影响因子：
10.8
作者：
Z. Qiu;Hanyan Fang;A. Carvalho;A. Rodin;Yanpeng Liu;Sherman Jun;R. Tan;Mykola Telychko;Pin Lv;Jie Su;Yewu Wang;A. Neto;Jiong Lu
通讯作者：
Z. Qiu;Hanyan Fang;A. Carvalho;A. Rodin;Yanpeng Liu;Sherman Jun;R. Tan;Mykola Telychko;Pin Lv;Jie Su;Yewu Wang;A. Neto;Jiong Lu
影响因子：
3.2
作者：
WARSCHAUER, DM
通讯作者：
WARSCHAUER, DM