Effects of domain walls in quantum anomalous Hall insulator/superconductor heterostructures

Effects of domain walls in quantum anomalous Hall insulator/superconductor heterostructures In a recent experiment, half-quantized longitudinal conductance plateaus (HQCPs) of height e22h have been observed in quantum anomalous Hall (QAH) insulator/superconductor heterostructure transport measurements. However, there are debates about whether these HQCPs are caused by Majorana edge modes or other trivial reasons. It was predicted that HQCPs can only appear when the Hall conductance σxy is quantized. Surprisingly, HQCPs appear when the Hall conductance σxy is only 80% of the quantized value at which extra conducting channels in the bulk should ruin the HQCPs. In this Rapid Communication, we explain how domain walls can cause σxy to deviate from its quantized value and at the same time maintain the quantization of HQCPs. Importantly, our study also explains a long standing puzzle of why ρxx can be finite when ρxy is quantized in QAH systems. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Effects of domain walls in quantum anomalous Hall insulator/superconductor heterostructures

Preview Only

Effects of domain walls in quantum anomalous Hall insulator/superconductor heterostructures

Abstract

In a recent experiment, half-quantized longitudinal conductance plateaus (HQCPs) of height e22h have been observed in quantum anomalous Hall (QAH) insulator/superconductor heterostructure transport measurements. However, there are debates about whether these HQCPs are caused by Majorana edge modes or other trivial reasons. It was predicted that HQCPs can only appear when the Hall conductance σxy is quantized. Surprisingly, HQCPs appear when the Hall conductance σxy is only 80% of the quantized value at which extra conducting channels in the bulk should ruin the HQCPs. In this Rapid Communication, we explain how domain walls can cause σxy to deviate from its quantized value and at the same time maintain the quantization of HQCPs. Importantly, our study also explains a long standing puzzle of why ρxx can be finite when ρxy is quantized in QAH systems.
Loading next page...
 
/lp/aps_physical/effects-of-domain-walls-in-quantum-anomalous-hall-insulator-iq4RqF80XK
Publisher
American Physical Society (APS)
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.041118
Publisher site
See Article on Publisher Site

Abstract

In a recent experiment, half-quantized longitudinal conductance plateaus (HQCPs) of height e22h have been observed in quantum anomalous Hall (QAH) insulator/superconductor heterostructure transport measurements. However, there are debates about whether these HQCPs are caused by Majorana edge modes or other trivial reasons. It was predicted that HQCPs can only appear when the Hall conductance σxy is quantized. Surprisingly, HQCPs appear when the Hall conductance σxy is only 80% of the quantized value at which extra conducting channels in the bulk should ruin the HQCPs. In this Rapid Communication, we explain how domain walls can cause σxy to deviate from its quantized value and at the same time maintain the quantization of HQCPs. Importantly, our study also explains a long standing puzzle of why ρxx can be finite when ρxy is quantized in QAH systems.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 18, 2017

There are no references for this article.

Sorry, we don’t have permission to share this article on DeepDyve,
but here are related articles that you can start reading right now:

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off