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Tunable discrete scale invariance in transition-metal pentatelluride flakes | | Yanzhao Liu
; Huichao Wang
; Haipeng Zhu
; Yanan Li
; Jun Ge
; Junfeng Wang
; Liang Li
; Ji-Yan Dai
; Jiaqiang Yan
; David Mandrus
; Robert Joynt
; Jian Wang
; | | Date: |
25 Nov 2020 | | Abstract: | Log-periodic quantum oscillations discovered in transition-metal
pentatelluride give a clear demonstration of discrete scale invariance (DSI) in
solid-state materials. The peculiar phenomenon is convincingly interpreted as
the presence of two-body quasi-bound states in a Coulomb potential. However,
the modifications of the Coulomb interactions in many-body systems having a
Dirac-like spectrum are not fully understood. Here, we report the observation
of tunable log-periodic oscillations and DSI in ZrTe5 and HfTe5 flakes. By
reducing the flakes thickness, the characteristic scale factor is tuned to a
much smaller value due to the reduction of the vacuum polarization effect. The
decreasing of the scale factor demonstrates the many-body effect on the DSI,
which has rarely been discussed hitherto. Furthermore, the cut-offs of
oscillations are quantitatively explained by considering the Thomas-Fermi
screening effect. Our work clarifies the many-body effect on DSI and paves a
way to tune the DSI in quantum materials. | | Source: | arXiv, 2011.12594 | | Services: | Forum | Review | PDF | Favorites | |
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