Lattice Dynamics of Bi1.9Dy0.1Te3 Topological Insulator

被引：0

作者：

Ghosh, Labanya ^{[1
]}

Gangwar, Vinod K. ^{[1
,6
]}

Singh, Mahima ^{[1
]}

Kumar, Satya Vijay ^{[1
]}

Dixit, Srishti ^{[1
]}

Verma, Abhineet ^{[2
]}

Sharma, Durgesh Kumar ^{[3
]}

Kumar, Sudhir ^{[4
]}

Saha, S. ^{[2
]}

Ghosh, A. K. ^{[5
]}

Chatterjee, Sandip ^{[1
]}

机构：

[1] Indian Inst Technol BHU, Dept Phys, Varanasi 221005, Uttar Pradesh, India

[2] Banaras Hindu Univ, Dept Chem, Varanasi 221005, Uttar Pradesh, India

[3] Jawharlal Nehru Ctr Adv Sci Res, Theoret Sci Unit, Bangalore 560064, Karnataka, India

[4] MJP Rohilkhand Univ, Fac Engn & Technol, Appl Phys Dept, Bareilly 243006, Uttar Pradesh, India

[5] Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh, India

[6] KGKPG Coll Moradabad, Moradabad 244001, Uttar Pradesh, India

来源：

PHYSICA B-CONDENSED MATTER | 2022年 / 640卷

关键词：

Topological insulators; Thermoelectric; Raman spectroscopy; Thermal conductivity; Density functional theory;

D O I：

暂无

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In this report, we have investigated the Density functional theory (DFT) calculation, temperature-dependent thermoelectric power and Raman spectroscopy of Bi1.9Dy0.1Te3 topological insulator (TI). In this system, discrepancy due to the rare earth ion Dy initiates a Red-shift in Raman active modes in the Bi2Te3 TI. Here, the lattice thermal conductivity (kappa(L)) was evaluated in the Umklapp scattering limit using the temperature dependency of the vibrational phonon modes and was used to evaluate the Figure of merit (ZT) of the system. It has been demonstrated that the estimated Power factor and ZT is very large, confirming the efficiency of Bi1.9Dy0.1Te3 for better thermoelectric and electronic applications. Such immense thermoelectric power value of the corresponding system was further supported by the DFT calculation.

引用

页数：8

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