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Proximity Effects and Topological Spin Currents in van der Waals Heterostructures (Final Report)

Technical Report ·
DOI:https://doi.org/10.2172/1973585· OSTI ID:1973585
 [1]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States)
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The major goal of this grant has been to study spin-polarized topological edge states. The original proposal was focused specifically on those of the quantum anomalous Hall (QAH) effect, which was proposed to be realizable via a (simultaneous) magnetic and spin-orbit proximity effect in graphene. En route to realizing the QAH effect, the goal was also to study the newly-discovered 2D magnetic insulators, which have finally been isolated in the single-to-few atomic layers from compounds whose bulk properties have known since the 1970s, and the extent to which magnetic effects could be seen in graphene via proximity coupling. Since the original proposal, the scope of the work has expanded to include study of the topological edge states of the quantum spin Hall (QSH) effect and how they are modified by proximity effects and in twisted bilayers. The broader scientific context of the experiments in this proposal is to understand the physical mechanisms behind proximity effects in van der Waals heterostructures. Perhaps the ultimate scientific and technological goal of realizing topological states through proximity effects is the creation of Majorana zero modes in solid-state devices, which has been identified as a major priority in condensed-matter physics and quantum information because of the potential use of Majorana zero modes in topological quantum computing. Van der Waals materials offer advantages in this area because of the diversity of materials that can potentially be used and the unique device architectures that are possible using the van der Waals assembly techniques.

Research Organization:
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
SC0018115
OSTI ID:
1973585
Report Number(s):
DE-SC0018115; TRN: US2404808
Country of Publication:
United States
Language:
English

References (12)

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Nanowire-Mesh-Templated Growth of Out-of-Plane Three-Dimensional Fuzzy Graphene journal May 2017
Charged Bosons Made of Fermions in Bilayer Structures with Strong Metallic Screening journal September 2021
Superconducting contact and quantum interference between two-dimensional van der Waals and three-dimensional conventional superconductors journal January 2021
Electrical Probes of the Non-Abelian Spin Liquid in Kitaev Materials journal July 2020
Observation of the Interlayer Exciton Gases in WSe 2 -p:WSe 2 Heterostructures journal June 2020
Tunneling Spectroscopy of Two-Dimensional Materials Based on Via Contacts journal November 2022
Tuning Ising superconductivity with layer and spin–orbit coupling in two-dimensional transition-metal dichalcogenides journal April 2018
Molecularly Thin Electrolyte for All Solid-State Nonvolatile Two-Dimensional Crystal Memory journal October 2019
Direct measurement of ferroelectric polarization in a tunable semimetal journal September 2021
Electron Transport in Multidimensional Fuzzy Graphene Nanostructures journal July 2019
Quantum Spin Hall Edge States and Interlayer Coupling in Twisted Bilayer WTe2 journal June 2022

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