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- Title
Anomalous quantization trajectory and parity anomaly in Co cluster decorated BiSbTeSe2 nanodevices.
- Authors
Shuai Zhang; Rui Wang; Geliang Yu; Xing-Chen Pan; Zhongxia Wei; Zhanbin Bai; Fucong Fei; Mingyu Wang; Fengqi Song; Baigeng Wang; Dingyu Xing; Guanghou Wang; Li Pi; Jinglei Zhang; Chuanying Xi; Yuheng Zhang; Jian Liao; Yongqing Li; Xuefeng Wang
- 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 renor-malization 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.
- Subjects
QUANTIZATION (Physics); DIRAC function; X-ray spectroscopy; MAGNETIC fields; CRYSTAL growth
- Publication
Nature Communications, 2017, Vol 8, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-017-01065-7