Edge-dependent topology in Kekulé lattices
Topological states of matter are robust quantum phases, characterised by propagating or localised edge states in an insulating bulk. Topological boundary states can be triggered by various mechanisms, for example by strong spin-orbit coupling. In this case, the existence of topological states does n...
Gespeichert in:
Veröffentlicht in: | arXiv.org 2019-06 |
---|---|
Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
container_end_page | |
---|---|
container_issue | |
container_start_page | |
container_title | arXiv.org |
container_volume | |
creator | Freeney, S E J J van den Broeke A J J Harsveld van der Veen Swart, I C Morais Smith |
description | Topological states of matter are robust quantum phases, characterised by propagating or localised edge states in an insulating bulk. Topological boundary states can be triggered by various mechanisms, for example by strong spin-orbit coupling. In this case, the existence of topological states does not depend on the termination of the material. On the other hand, topological phases can also occur in systems without spin-orbit coupling, such as topological crystalline insulators. In these systems, the protection mechanism originates from the crystal symmetry. Here, we show that for topological crystalline insulators with the same bulk, different edge geometries can lead to topological or trivial states. We artificially engineer and investigate a 2D electronic dimerised honeycomb structure, known as the Kekulé lattice, on the nanoscale. The surface electrons of Cu(111) are confined into this geometry by positioning repulsive scatterers (carbon monoxide molecules) with atomic precision, using the tip of a scanning tunnelling microscope. We show experimentally and theoretically that for the same bulk, molecular zigzag and partially bearded edges lead to topological or trivial states in the opposite range of parameters, thus revealing a subtle link between topology and edge termination. Our results shed further light on the nature of topological states and might be useful for future manipulations of these states, with the aim of designing valves or other more complex devices. |
doi_str_mv | 10.48550/arxiv.1906.09051 |
format | Article |
fullrecord | <record><control><sourceid>proquest</sourceid><recordid>TN_cdi_proquest_journals_2245978028</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2245978028</sourcerecordid><originalsourceid>FETCH-proquest_journals_22459780283</originalsourceid><addsrcrecordid>eNpjYJA0NNAzsTA1NdBPLKrILNMztDQw0zOwNDA1ZGLgNDI2NtS1MDEy4mDgLS7OMjAwMDIzNzI1NeZk0HZNSU_VTUktSM1LSc0rUSjJL8jPyU-vVMjMU_BOzS7NObxSISexpCQzObWYh4E1LTGnOJUXSnMzKLu5hjh76BYU5ReWphaXxGfllxblAaXijYxMTC3NLQyMLIyJUwUA7Cs4Lg</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2245978028</pqid></control><display><type>article</type><title>Edge-dependent topology in Kekulé lattices</title><source>Free E- Journals</source><creator>Freeney, S E ; J J van den Broeke ; A J J Harsveld van der Veen ; Swart, I ; C Morais Smith</creator><creatorcontrib>Freeney, S E ; J J van den Broeke ; A J J Harsveld van der Veen ; Swart, I ; C Morais Smith</creatorcontrib><description>Topological states of matter are robust quantum phases, characterised by propagating or localised edge states in an insulating bulk. Topological boundary states can be triggered by various mechanisms, for example by strong spin-orbit coupling. In this case, the existence of topological states does not depend on the termination of the material. On the other hand, topological phases can also occur in systems without spin-orbit coupling, such as topological crystalline insulators. In these systems, the protection mechanism originates from the crystal symmetry. Here, we show that for topological crystalline insulators with the same bulk, different edge geometries can lead to topological or trivial states. We artificially engineer and investigate a 2D electronic dimerised honeycomb structure, known as the Kekulé lattice, on the nanoscale. The surface electrons of Cu(111) are confined into this geometry by positioning repulsive scatterers (carbon monoxide molecules) with atomic precision, using the tip of a scanning tunnelling microscope. We show experimentally and theoretically that for the same bulk, molecular zigzag and partially bearded edges lead to topological or trivial states in the opposite range of parameters, thus revealing a subtle link between topology and edge termination. Our results shed further light on the nature of topological states and might be useful for future manipulations of these states, with the aim of designing valves or other more complex devices.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1906.09051</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Carbon monoxide ; Coupling (molecular) ; Crystal structure ; Crystallinity ; Honeycomb structures ; Insulators ; Lattices ; Spin-orbit interactions ; Topology</subject><ispartof>arXiv.org, 2019-06</ispartof><rights>2019. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>780,784,27925</link.rule.ids></links><search><creatorcontrib>Freeney, S E</creatorcontrib><creatorcontrib>J J van den Broeke</creatorcontrib><creatorcontrib>A J J Harsveld van der Veen</creatorcontrib><creatorcontrib>Swart, I</creatorcontrib><creatorcontrib>C Morais Smith</creatorcontrib><title>Edge-dependent topology in Kekulé lattices</title><title>arXiv.org</title><description>Topological states of matter are robust quantum phases, characterised by propagating or localised edge states in an insulating bulk. Topological boundary states can be triggered by various mechanisms, for example by strong spin-orbit coupling. In this case, the existence of topological states does not depend on the termination of the material. On the other hand, topological phases can also occur in systems without spin-orbit coupling, such as topological crystalline insulators. In these systems, the protection mechanism originates from the crystal symmetry. Here, we show that for topological crystalline insulators with the same bulk, different edge geometries can lead to topological or trivial states. We artificially engineer and investigate a 2D electronic dimerised honeycomb structure, known as the Kekulé lattice, on the nanoscale. The surface electrons of Cu(111) are confined into this geometry by positioning repulsive scatterers (carbon monoxide molecules) with atomic precision, using the tip of a scanning tunnelling microscope. We show experimentally and theoretically that for the same bulk, molecular zigzag and partially bearded edges lead to topological or trivial states in the opposite range of parameters, thus revealing a subtle link between topology and edge termination. Our results shed further light on the nature of topological states and might be useful for future manipulations of these states, with the aim of designing valves or other more complex devices.</description><subject>Carbon monoxide</subject><subject>Coupling (molecular)</subject><subject>Crystal structure</subject><subject>Crystallinity</subject><subject>Honeycomb structures</subject><subject>Insulators</subject><subject>Lattices</subject><subject>Spin-orbit interactions</subject><subject>Topology</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNpjYJA0NNAzsTA1NdBPLKrILNMztDQw0zOwNDA1ZGLgNDI2NtS1MDEy4mDgLS7OMjAwMDIzNzI1NeZk0HZNSU_VTUktSM1LSc0rUSjJL8jPyU-vVMjMU_BOzS7NObxSISexpCQzObWYh4E1LTGnOJUXSnMzKLu5hjh76BYU5ReWphaXxGfllxblAaXijYxMTC3NLQyMLIyJUwUA7Cs4Lg</recordid><startdate>20190621</startdate><enddate>20190621</enddate><creator>Freeney, S E</creator><creator>J J van den Broeke</creator><creator>A J J Harsveld van der Veen</creator><creator>Swart, I</creator><creator>C Morais Smith</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20190621</creationdate><title>Edge-dependent topology in Kekulé lattices</title><author>Freeney, S E ; J J van den Broeke ; A J J Harsveld van der Veen ; Swart, I ; C Morais Smith</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-proquest_journals_22459780283</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Carbon monoxide</topic><topic>Coupling (molecular)</topic><topic>Crystal structure</topic><topic>Crystallinity</topic><topic>Honeycomb structures</topic><topic>Insulators</topic><topic>Lattices</topic><topic>Spin-orbit interactions</topic><topic>Topology</topic><toplevel>online_resources</toplevel><creatorcontrib>Freeney, S E</creatorcontrib><creatorcontrib>J J van den Broeke</creatorcontrib><creatorcontrib>A J J Harsveld van der Veen</creatorcontrib><creatorcontrib>Swart, I</creatorcontrib><creatorcontrib>C Morais Smith</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Freeney, S E</au><au>J J van den Broeke</au><au>A J J Harsveld van der Veen</au><au>Swart, I</au><au>C Morais Smith</au><format>book</format><genre>document</genre><ristype>GEN</ristype><atitle>Edge-dependent topology in Kekulé lattices</atitle><jtitle>arXiv.org</jtitle><date>2019-06-21</date><risdate>2019</risdate><eissn>2331-8422</eissn><abstract>Topological states of matter are robust quantum phases, characterised by propagating or localised edge states in an insulating bulk. Topological boundary states can be triggered by various mechanisms, for example by strong spin-orbit coupling. In this case, the existence of topological states does not depend on the termination of the material. On the other hand, topological phases can also occur in systems without spin-orbit coupling, such as topological crystalline insulators. In these systems, the protection mechanism originates from the crystal symmetry. Here, we show that for topological crystalline insulators with the same bulk, different edge geometries can lead to topological or trivial states. We artificially engineer and investigate a 2D electronic dimerised honeycomb structure, known as the Kekulé lattice, on the nanoscale. The surface electrons of Cu(111) are confined into this geometry by positioning repulsive scatterers (carbon monoxide molecules) with atomic precision, using the tip of a scanning tunnelling microscope. We show experimentally and theoretically that for the same bulk, molecular zigzag and partially bearded edges lead to topological or trivial states in the opposite range of parameters, thus revealing a subtle link between topology and edge termination. Our results shed further light on the nature of topological states and might be useful for future manipulations of these states, with the aim of designing valves or other more complex devices.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1906.09051</doi><oa>free_for_read</oa></addata></record> |
fulltext | fulltext |
identifier | EISSN: 2331-8422 |
ispartof | arXiv.org, 2019-06 |
issn | 2331-8422 |
language | eng |
recordid | cdi_proquest_journals_2245978028 |
source | Free E- Journals |
subjects | Carbon monoxide Coupling (molecular) Crystal structure Crystallinity Honeycomb structures Insulators Lattices Spin-orbit interactions Topology |
title | Edge-dependent topology in Kekulé lattices |
url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-24T07%3A15%3A23IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest&rft_val_fmt=info:ofi/fmt:kev:mtx:book&rft.genre=document&rft.atitle=Edge-dependent%20topology%20in%20Kekul%C3%A9%20lattices&rft.jtitle=arXiv.org&rft.au=Freeney,%20S%20E&rft.date=2019-06-21&rft.eissn=2331-8422&rft_id=info:doi/10.48550/arxiv.1906.09051&rft_dat=%3Cproquest%3E2245978028%3C/proquest%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2245978028&rft_id=info:pmid/&rfr_iscdi=true |