Group delay time and Hartman effect in strained Weyl semimetals. (21st October 2019)

• Record Type: Journal Article
• Authors: Xu, Zhonghui; Siu, Zhuo Bin; Chen, Yan; Huang, Jinsong; Li, Yanling; Sun, Chi; Yesilyurt, Can; Jalil, Mansoor B A
• Is Part Of: Journal of physics. Volume 32:Number 3(2020)
• Publication Date: 2019-10-21
• Subjects: Weyl semimetals -- Hartman effect -- tunneling -- dwell time -- group delay time; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ab4619
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: The group delay time was theoretically studied in Weyl semimetals (WSMs) in the presence of strain. The Hartman effect, where the delay time for tunneling through a barrier tends to a constant for large barrier thickness, can be observed in WSMs when the incident angles and, and the unidirectional strain tensor u 33 and shear strain tensor u 32, are larger than some critical values. We show that the Hartman effect is strongly dependent on the strength of the unidirectional strain tensor u 33 and the ratio of the shear strain tensor . We also found that tensile and compressive strains have different effects on the group delay time and the transmission probability T in WSMs. Our study shows the possibility of modulating the group delay time and the Hartman effect in strained WSMs.