Author
Listed:
- Shuai Zhang
(Nanjing University)
- Li Pi
(University of Science and Technology of China
Chinese Academy of Sciences and Collaborative Innovation Center of Advanced Microstructures)
- 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)
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.
Suggested Citation
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 Son, 2017.
"Anomalous quantization trajectory and parity anomaly in Co cluster decorated BiSbTeSe2 nanodevices,"
Nature Communications, Nature, vol. 8(1), pages 1-6, December.
Handle:
RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01065-7
DOI: 10.1038/s41467-017-01065-7
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