Journal
PHYSICAL REVIEW B
Volume 89, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.155317
Keywords
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Funding
- ARO [W911NF-12-1-0334]
- AFOSR [FA9550-13-1-0045, FA9550-12-1-0479]
- NSF-PHY [1104546]
- NFSC [11304014]
- 973 Program of China [2013CB934500]
- BIT Basic Research Funds [20131842001, 20121842003]
- HKSAR Research Grant Council [HKU705513P]
- Croucher Foundation under the Croucher Innovation Award
- U.S. DOE, BES, Division of Materials Sciences and Engineering [DE-SC0008145]
- U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
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Majorana fermions, quantum particles with non-Abelian exchange statistics, are not only of fundamental importance, but also building blocks for fault-tolerant quantum computation. Although certain experimental breakthroughs for observing Majorana fermions have been made recently, their conclusive detection is still challenging due to the lack of proper material properties of the underlined experimental systems. Here we propose a platform for Majorana fermions based on edge states of certain nontopological two-dimensional semiconductors with strong spin-orbit coupling, such as monolayer group-VI transition-metal dichalcogenides (TMDs). Using first-principles calculations and tight-binding modeling, we show that zigzag edges of monolayer TMD can host a well isolated single edge band with strong spin-orbit-coupling energy. Combining with proximity induced s-wave superconductivity and in-plane magnetic fields, the zigzag edge supports robust topological Majorana bound states at the edge ends, although the two-dimensional bulk itself is nontopological.
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