arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1506.03346cond-mat.str-el
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WTe2的温度诱导Lifshitz转变

Temperature induced Lifshitz transition in WTe2

Yun Wu, Na Hyun Jo, Masayuki Ochi, Lunan Huang, Daixiang Mou, Sergey L. Bud'ko, P. C. Canfield, Nandini Trivedi, Ryotaro Arita, Adam Kaminski

摘要:

我们使用超高分辨率,可调谐,真空紫外激光为基础的,角分辨光电子能谱(ARPES)和温度和场相关的电阻率和热电功率(TEP)测量研究的电子性质的WTe 2,一种化合物,表现出非常大的,温度相关的磁电阻。TEP的温度依赖性在T=175 K处显示出斜率的变化,并且Kohler规则在70-140 K范围以上被打破。费米面沿X-Gamma-X方向由两个电子袋和两对空穴袋组成。当温度从40 K升高时,空穴袋逐渐下沉到化学势以下。像BaFe 2As 2一样,WTe 2的费米面在温度的适度变化下会发生明显而实质性的变化。在WTe 2中,这导致了一个罕见的例子,温度引起的Lifshitz转变,与空穴袋的完全消失。电子结构的这些剧烈变化自然解释了输运数据的不寻常特征。

英文摘要:

We use ultra-high resolution, tunable, VUV laser-based, angle-resolved photoemission spectroscopy (ARPES) and temperature and field dependent resistivity and thermoelectric power (TEP) measurements to study the electronic properties of WTe2, a compound that manifests exceptionally large, temperature dependent magnetoresistance. The temperature dependence of the TEP shows a change of slope at T=175 K and the Kohler rule breaks down above 70-140 K range. The Fermi surface consists of two electron pockets and two pairs of hole pockets along the X-Gamma-X direction. Upon increase of temperature from 40K, the hole pockets gradually sink below the chemical potential. Like BaFe2As2, WTe2 has clear and substantial changes in its Fermi surface driven by modest changes in temperature. In WTe2, this leads to a rare example of temperature induced Lifshitz transition, associated with the complete disappearance of the hole pockets. These dramatic changes of the electronic structure naturally explain unusual features of the transport data.

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