Quasi-one-dimensional Quantum Anomalous Hall Systems as New Platforms for Scalable Topological Quantum Computation
ORAL
Abstract
Quantum anomalous Hall insulator/superconductor heterostructures emerged as a competitive platform to realize topological superconductors with chiral Majorana edge states as shown in recent experiments [He et al. Science 357, 294 (2017)]. However, chiral Majorana modes, being extended, cannot be used for topological quantum computation. In this work, we show that quasi-one-dimensional quantum anomalous Hall structures exhibit a large topological regime (much larger than the two-dimensional case) which supports localized Majorana zero energy modes. The non-Abelian properties of a cross-shaped quantum anomalous Hall junction is shown explicitly by time-dependent calculations. We believe that networks of such quasi-one-dimensional quantum anomalousHall systems can be easily fabricated for scalable topological quantum computation.
*KTL acknowledges the support of HKRGC, Croucher Foundation and Dr. Tai-chin Lo Foundation through C6026-16W, 16303014, 16324216, 16307117 and Croucher Innovation Grant. JL is supported by NSF-China under Grant Nos.11574245. PAL acknowledges the support by DOE grant FG02-03ER46076
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Presenters
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Yingming XIE
- Department of Physics, Hong Kong University of Science and Technology