Probing helicity and the topological origins of helicity via non-local Hanbury-Brown and Twiss correlations

Abstract Quantum Hall edge modes are chiral while quantum spin Hall edge modes are helical. However, unlike chiral edge modes which always occur in topological systems, quasi-helical edge modes may arise in a trivial insulator too. These trivial quasi-helical edge modes are not topologically protect...

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Autores principales:	Arjun Mani, Colin Benjamin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ad7750149e0b42d58101a27e694595ac
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spelling	oai:doaj.org-article:ad7750149e0b42d58101a27e694595ac2021-12-02T15:05:07ZProbing helicity and the topological origins of helicity via non-local Hanbury-Brown and Twiss correlations10.1038/s41598-017-06820-w2045-2322https://doaj.org/article/ad7750149e0b42d58101a27e694595ac2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06820-whttps://doaj.org/toc/2045-2322Abstract Quantum Hall edge modes are chiral while quantum spin Hall edge modes are helical. However, unlike chiral edge modes which always occur in topological systems, quasi-helical edge modes may arise in a trivial insulator too. These trivial quasi-helical edge modes are not topologically protected and therefore need to be distinguished from helical edge modes arising due to topological reasons. Earlier conductance measurements were used to identify these helical states, in this work we report on the advantage of using the non local shot noise as a probe for the helical nature of these states as also their topological or otherwise origin and compare them with chiral quantum Hall states. We see that in similar set-ups affected by same degree of disorder and inelastic scattering, non local shot noise “HBT” correlations can be positive for helical edge modes but are always negative for the chiral quantum Hall edge modes. Further, while trivial quasi-helical edge modes exhibit negative non-local”HBT” charge correlations, topological helical edge modes can show positive non-local “HBT” charge correlation. We also study the non-local spin correlations and Fano factor for clues as regards both the distinction between chirality/helicity as well as the topological/trivial dichotomy for helical edge modes.Arjun ManiColin BenjaminNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-19 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Arjun Mani Colin Benjamin Probing helicity and the topological origins of helicity via non-local Hanbury-Brown and Twiss correlations
description	Abstract Quantum Hall edge modes are chiral while quantum spin Hall edge modes are helical. However, unlike chiral edge modes which always occur in topological systems, quasi-helical edge modes may arise in a trivial insulator too. These trivial quasi-helical edge modes are not topologically protected and therefore need to be distinguished from helical edge modes arising due to topological reasons. Earlier conductance measurements were used to identify these helical states, in this work we report on the advantage of using the non local shot noise as a probe for the helical nature of these states as also their topological or otherwise origin and compare them with chiral quantum Hall states. We see that in similar set-ups affected by same degree of disorder and inelastic scattering, non local shot noise “HBT” correlations can be positive for helical edge modes but are always negative for the chiral quantum Hall edge modes. Further, while trivial quasi-helical edge modes exhibit negative non-local”HBT” charge correlations, topological helical edge modes can show positive non-local “HBT” charge correlation. We also study the non-local spin correlations and Fano factor for clues as regards both the distinction between chirality/helicity as well as the topological/trivial dichotomy for helical edge modes.
format	article
author	Arjun Mani Colin Benjamin
author_facet	Arjun Mani Colin Benjamin
author_sort	Arjun Mani
title	Probing helicity and the topological origins of helicity via non-local Hanbury-Brown and Twiss correlations
title_short	Probing helicity and the topological origins of helicity via non-local Hanbury-Brown and Twiss correlations
title_full	Probing helicity and the topological origins of helicity via non-local Hanbury-Brown and Twiss correlations
title_fullStr	Probing helicity and the topological origins of helicity via non-local Hanbury-Brown and Twiss correlations
title_full_unstemmed	Probing helicity and the topological origins of helicity via non-local Hanbury-Brown and Twiss correlations
title_sort	probing helicity and the topological origins of helicity via non-local hanbury-brown and twiss correlations
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/ad7750149e0b42d58101a27e694595ac
work_keys_str_mv	AT arjunmani probinghelicityandthetopologicaloriginsofhelicityvianonlocalhanburybrownandtwisscorrelations AT colinbenjamin probinghelicityandthetopologicaloriginsofhelicityvianonlocalhanburybrownandtwisscorrelations
_version_	1718388976892510208

Probing helicity and the topological origins of helicity via non-local Hanbury-Brown and Twiss correlations

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