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Chin. Phys. B, 2016, Vol. 25(1): 017202    DOI: 10.1088/1674-1056/25/1/017202
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Unexpected low thermal conductivity and large power factor in Dirac semimetal Cd3As2

Cheng Zhang(张成)1,2, Tong Zhou(周通)1,2,3, Sihang Liang(梁斯航)1,2, Junzhi Cao(曹钧植)1,2,Xiang Yuan(袁翔)1,2, Yanwen Liu(刘彦闻)1,2, Yao Shen(沈瑶)1,2, Qisi Wang(王奇思)1,2,Jun Zhao(赵俊)1,2, Zhongqin Yang(杨中芹)1,2,3, Faxian Xiu(修发贤)1,2
1. State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
2. Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China;
3. Key Laboratory for Computational Physical Sciences (MOE), Fudan University, Shanghai 200433, China
Abstract  

Thermoelectrics has long been considered as a promising way of power generation for the next decades. So far, extensive efforts have been devoted to the search of ideal thermoelectric materials, which require both high electrical conductivity and low thermal conductivity. Recently, the emerging Dirac semimetal Cd3As2, a three-dimensional analogue of graphene, has been reported to host ultra-high mobility and good electrical conductivity as metals. Here, we report the observation of unexpected low thermal conductivity in Cd3As2, one order of magnitude lower than the conventional metals or semimetals with a similar electrical conductivity, despite the semimetal band structure and high electron mobility. The power factor also reaches a large value of 1.58 mW·m-1·K-2 at room temperature and remains non-saturated up to 400 K. Corroborating with the first-principles calculations, we find that the thermoelectric performance can be well-modulated by the carrier concentration in a wide range. This work demonstrates the Dirac semimetal Cd3As2 as a potential candidate of thermoelectric materials.

Keywords:  Dirac semimetal      thermal conductivity      power factor      thermoelectric material  
Received:  25 November 2015      Revised:  25 November 2015      Accepted manuscript online: 
PACS:  72.20.Pa (Thermoelectric and thermomagnetic effects)  
  72.20.Jv (Charge carriers: generation, recombination, lifetime, and trapping)  
  72.15.-v (Electronic conduction in metals and alloys)  
Corresponding Authors:  Faxian Xiu     E-mail:  faxian@fudan.edu.cn

Cite this article: 

Cheng Zhang(张成), Tong Zhou(周通), Sihang Liang(梁斯航), Junzhi Cao(曹钧植),Xiang Yuan(袁翔), Yanwen Liu(刘彦闻), Yao Shen(沈瑶), Qisi Wang(王奇思),Jun Zhao(赵俊), Zhongqin Yang(杨中芹), Faxian Xiu(修发贤) Unexpected low thermal conductivity and large power factor in Dirac semimetal Cd3As2 2016 Chin. Phys. B 25 017202

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