Anomalous quantization trajectory and parity anomaly in Co cluster decorated BiSbTeSe2 nanodevices

Shuai Zhang, Li Pi, Rui Wang, Geliang Yu, Xing-Chen Pan, Zhongxia Wei, Jinglei Zhang, Chuanying Xi, Zhanbin Bai, Fucong Fei, Mingyu Wang, Jian Liao, Yongqing Li, Xuefeng Wang, Fengqi Song (), Yuheng Zhang (), Baigeng Wang (), Dingyu Xing and Guanghou Wang
Additional contact information
Shuai Zhang: Nanjing University
Li Pi: University of Science and Technology of China
Rui Wang: Nanjing University
Geliang Yu: Nanjing University
Xing-Chen Pan: Nanjing University
Zhongxia Wei: Nanjing University
Jinglei Zhang: Chinese Academy of Sciences and Collaborative Innovation Center of Advanced Microstructures
Chuanying Xi: Chinese Academy of Sciences and Collaborative Innovation Center of Advanced Microstructures
Zhanbin Bai: Nanjing University
Fucong Fei: Nanjing University
Mingyu Wang: Nanjing University
Jian Liao: Chinese Academy of Sciences
Yongqing Li: Chinese Academy of Sciences
Xuefeng Wang: Nanjing University
Fengqi Song: Nanjing University
Yuheng Zhang: Chinese Academy of Sciences and Collaborative Innovation Center of Advanced Microstructures
Baigeng Wang: Nanjing University
Dingyu Xing: Nanjing University
Guanghou Wang: Nanjing University

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Dirac Fermions with different helicities exist on the top and bottom surfaces of topological insulators, offering a rare opportunity to break the degeneracy protected by the no-go theorem. Through the application of Co clusters, quantum Hall plateaus were modulated for the topological insulator BiSbTeSe2, allowing an optimized surface transport. Here, using renormalization group flow diagrams, we show the extraction of two sets of converging points in the conductivity tensor space, revealing that the top surface exhibits an anomalous quantization trajectory, while the bottom surface retains the 1/2 quantization. Co clusters are believed to induce a sizeable Zeeman gap ( > 4.8 meV) through antiferromagnetic exchange coupling, which delays the Landau level hybridization on the top surface for a moderate magnetic field. A quasi-half-integer plateau also appears at −7.2 Tesla. This allows us to study the interesting physics of parity anomaly, and paves the way for further studies simulating exotic particles in condensed matter physics.

Date: 2017
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DOI: 10.1038/s41467-017-01065-7

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