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Title: Tunable discrete scale invariance in transition-metal pentatelluride flakes

Journal Article · · npj Quantum Materials
 [1];  [2];  [3];  [1];  [1];  [3];  [3]; ORCiD logo [4];  [5];  [6];  [7]; ORCiD logo [8]
  1. Peking Univ., Beijing (China)
  2. Sun Yat-Sen Univ., Guangzhou (China)
  3. Huazhong Univ. of Science and Technology, Wuhan (China)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Hong Kong Polytechnic Univ. (China)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  7. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Wisconsin, Madison, WI (United States)
  8. Peking Univ., Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Beijing Academy of Quantum Information Sciences (China)

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. Finally, our work clarifies the many-body effect on DSI and paves a way to tune the DSI in quantum materials.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Key Research and Development Program of China; National Natural Science Foundation of China (NNSFC); Beijing Natural Science Foundation; Chinese Academy of Sciences (CAS)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1756231
Journal Information:
npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 5; ISSN 2397-4648
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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