Size quantization of Dirac fermions in graphene constrictions
Quantum point contacts (QPCs) are cornerstones of mesoscopic physics and central building blocks for quantum electronics. Although the Fermi wave-length in high-quality bulk graphene can be tuned up to hundreds of nanometers, the observation of quantum confinement of Dirac electrons in nanostructure...
Gespeichert in:
| Veröffentlicht in: | arXiv.org 2016-04 |
|---|---|
| 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 | Terrés, B Chizhova, L A Libisch, F Peiro, J Jörger, D Engels, S Girschik, A Watanabe, K Taniguchi, T Rotkin, S V Burgdörfer, J Stampfer, C |
| description | Quantum point contacts (QPCs) are cornerstones of mesoscopic physics and central building blocks for quantum electronics. Although the Fermi wave-length in high-quality bulk graphene can be tuned up to hundreds of nanometers, the observation of quantum confinement of Dirac electrons in nanostructured graphene systems has proven surprisingly challenging. Here we show ballistic transport and quantized conductance of size-confined Dirac fermions in lithographically-defined graphene constrictions. At high charge carrier densities, the observed conductance agrees excellently with the Landauer theory of ballistic transport without any adjustable parameter. Experimental data and simulations for the evolution of the conductance with magnetic field unambiguously confirm the identification of size quantization in the constriction. Close to the charge neutrality point, bias voltage spectroscopy reveals a renormalized Fermi velocity (\(v_F \approx 1.5 \times 10^6 m/s\)) in our graphene constrictions. Moreover, at low carrier density transport measurements allow probing the density of localized states at edges, thus offering a unique handle on edge physics in graphene devices. |
| doi_str_mv | 10.48550/arxiv.1603.00844 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_arxiv</sourceid><recordid>TN_cdi_arxiv_primary_1603_00844</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2080094996</sourcerecordid><originalsourceid>FETCH-LOGICAL-a526-9e1b5160a2d4c54963b627a70eb9e850038c11270c783de55e71a5b1f26046383</originalsourceid><addsrcrecordid>eNotj0tLAzEUhYMgWGp_gCsDrqfevDMLF1KfUHBh98OdNKMpdmaazIj215u2ri4cPs49HyFXDObSKgW3GH_C95xpEHMAK-UZmXAhWGEl5xdkltIGALg2XCkxIXfvYe_pbsR2CHscQtfSrqEPIaKjjY_bHCQaWvoRsf_0racuB0MM7oCmS3Le4Ffys_87Jaunx9XipVi-Pb8u7pcFKq6L0rNa5UHI19IpWWpRa27QgK9LbxWAsI4xbsAZK9ZeKW8Yqpo1XIPUwoopuT7VHt2qPoYtxt_q4FgdHTNxcyL62O1Gn4Zq042xzZsqDhaglGV--weog1Ln</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2080094996</pqid></control><display><type>article</type><title>Size quantization of Dirac fermions in graphene constrictions</title><source>arXiv.org</source><source>Free E- Journals</source><creator>Terrés, B ; Chizhova, L A ; Libisch, F ; Peiro, J ; Jörger, D ; Engels, S ; Girschik, A ; Watanabe, K ; Taniguchi, T ; Rotkin, S V ; Burgdörfer, J ; Stampfer, C</creator><creatorcontrib>Terrés, B ; Chizhova, L A ; Libisch, F ; Peiro, J ; Jörger, D ; Engels, S ; Girschik, A ; Watanabe, K ; Taniguchi, T ; Rotkin, S V ; Burgdörfer, J ; Stampfer, C</creatorcontrib><description>Quantum point contacts (QPCs) are cornerstones of mesoscopic physics and central building blocks for quantum electronics. Although the Fermi wave-length in high-quality bulk graphene can be tuned up to hundreds of nanometers, the observation of quantum confinement of Dirac electrons in nanostructured graphene systems has proven surprisingly challenging. Here we show ballistic transport and quantized conductance of size-confined Dirac fermions in lithographically-defined graphene constrictions. At high charge carrier densities, the observed conductance agrees excellently with the Landauer theory of ballistic transport without any adjustable parameter. Experimental data and simulations for the evolution of the conductance with magnetic field unambiguously confirm the identification of size quantization in the constriction. Close to the charge neutrality point, bias voltage spectroscopy reveals a renormalized Fermi velocity (\(v_F \approx 1.5 \times 10^6 m/s\)) in our graphene constrictions. Moreover, at low carrier density transport measurements allow probing the density of localized states at edges, thus offering a unique handle on edge physics in graphene devices.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1603.00844</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Carrier density ; Charge density ; Constrictions ; Current carriers ; Fermions ; Graphene ; Measurement ; Mesoscopic physics ; Physics - Mesoscale and Nanoscale Physics ; Quantum confinement ; Quantum electronics ; Resistance</subject><ispartof>arXiv.org, 2016-04</ispartof><rights>2016. 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><rights>http://arxiv.org/licenses/nonexclusive-distrib/1.0</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,776,780,881,27902</link.rule.ids><backlink>$$Uhttps://doi.org/10.48550/arXiv.1603.00844$$DView paper in arXiv$$Hfree_for_read</backlink><backlink>$$Uhttps://doi.org/10.1038/ncomms11528$$DView published paper (Access to full text may be restricted)$$Hfree_for_read</backlink></links><search><creatorcontrib>Terrés, B</creatorcontrib><creatorcontrib>Chizhova, L A</creatorcontrib><creatorcontrib>Libisch, F</creatorcontrib><creatorcontrib>Peiro, J</creatorcontrib><creatorcontrib>Jörger, D</creatorcontrib><creatorcontrib>Engels, S</creatorcontrib><creatorcontrib>Girschik, A</creatorcontrib><creatorcontrib>Watanabe, K</creatorcontrib><creatorcontrib>Taniguchi, T</creatorcontrib><creatorcontrib>Rotkin, S V</creatorcontrib><creatorcontrib>Burgdörfer, J</creatorcontrib><creatorcontrib>Stampfer, C</creatorcontrib><title>Size quantization of Dirac fermions in graphene constrictions</title><title>arXiv.org</title><description>Quantum point contacts (QPCs) are cornerstones of mesoscopic physics and central building blocks for quantum electronics. Although the Fermi wave-length in high-quality bulk graphene can be tuned up to hundreds of nanometers, the observation of quantum confinement of Dirac electrons in nanostructured graphene systems has proven surprisingly challenging. Here we show ballistic transport and quantized conductance of size-confined Dirac fermions in lithographically-defined graphene constrictions. At high charge carrier densities, the observed conductance agrees excellently with the Landauer theory of ballistic transport without any adjustable parameter. Experimental data and simulations for the evolution of the conductance with magnetic field unambiguously confirm the identification of size quantization in the constriction. Close to the charge neutrality point, bias voltage spectroscopy reveals a renormalized Fermi velocity (\(v_F \approx 1.5 \times 10^6 m/s\)) in our graphene constrictions. Moreover, at low carrier density transport measurements allow probing the density of localized states at edges, thus offering a unique handle on edge physics in graphene devices.</description><subject>Carrier density</subject><subject>Charge density</subject><subject>Constrictions</subject><subject>Current carriers</subject><subject>Fermions</subject><subject>Graphene</subject><subject>Measurement</subject><subject>Mesoscopic physics</subject><subject>Physics - Mesoscale and Nanoscale Physics</subject><subject>Quantum confinement</subject><subject>Quantum electronics</subject><subject>Resistance</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><sourceid>GOX</sourceid><recordid>eNotj0tLAzEUhYMgWGp_gCsDrqfevDMLF1KfUHBh98OdNKMpdmaazIj215u2ri4cPs49HyFXDObSKgW3GH_C95xpEHMAK-UZmXAhWGEl5xdkltIGALg2XCkxIXfvYe_pbsR2CHscQtfSrqEPIaKjjY_bHCQaWvoRsf_0racuB0MM7oCmS3Le4Ffys_87Jaunx9XipVi-Pb8u7pcFKq6L0rNa5UHI19IpWWpRa27QgK9LbxWAsI4xbsAZK9ZeKW8Yqpo1XIPUwoopuT7VHt2qPoYtxt_q4FgdHTNxcyL62O1Gn4Zq042xzZsqDhaglGV--weog1Ln</recordid><startdate>20160407</startdate><enddate>20160407</enddate><creator>Terrés, B</creator><creator>Chizhova, L A</creator><creator>Libisch, F</creator><creator>Peiro, J</creator><creator>Jörger, D</creator><creator>Engels, S</creator><creator>Girschik, A</creator><creator>Watanabe, K</creator><creator>Taniguchi, T</creator><creator>Rotkin, S V</creator><creator>Burgdörfer, J</creator><creator>Stampfer, C</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><scope>GOX</scope></search><sort><creationdate>20160407</creationdate><title>Size quantization of Dirac fermions in graphene constrictions</title><author>Terrés, B ; Chizhova, L A ; Libisch, F ; Peiro, J ; Jörger, D ; Engels, S ; Girschik, A ; Watanabe, K ; Taniguchi, T ; Rotkin, S V ; Burgdörfer, J ; Stampfer, C</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a526-9e1b5160a2d4c54963b627a70eb9e850038c11270c783de55e71a5b1f26046383</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Carrier density</topic><topic>Charge density</topic><topic>Constrictions</topic><topic>Current carriers</topic><topic>Fermions</topic><topic>Graphene</topic><topic>Measurement</topic><topic>Mesoscopic physics</topic><topic>Physics - Mesoscale and Nanoscale Physics</topic><topic>Quantum confinement</topic><topic>Quantum electronics</topic><topic>Resistance</topic><toplevel>online_resources</toplevel><creatorcontrib>Terrés, B</creatorcontrib><creatorcontrib>Chizhova, L A</creatorcontrib><creatorcontrib>Libisch, F</creatorcontrib><creatorcontrib>Peiro, J</creatorcontrib><creatorcontrib>Jörger, D</creatorcontrib><creatorcontrib>Engels, S</creatorcontrib><creatorcontrib>Girschik, A</creatorcontrib><creatorcontrib>Watanabe, K</creatorcontrib><creatorcontrib>Taniguchi, T</creatorcontrib><creatorcontrib>Rotkin, S V</creatorcontrib><creatorcontrib>Burgdörfer, J</creatorcontrib><creatorcontrib>Stampfer, C</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><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Terrés, B</au><au>Chizhova, L A</au><au>Libisch, F</au><au>Peiro, J</au><au>Jörger, D</au><au>Engels, S</au><au>Girschik, A</au><au>Watanabe, K</au><au>Taniguchi, T</au><au>Rotkin, S V</au><au>Burgdörfer, J</au><au>Stampfer, C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Size quantization of Dirac fermions in graphene constrictions</atitle><jtitle>arXiv.org</jtitle><date>2016-04-07</date><risdate>2016</risdate><eissn>2331-8422</eissn><abstract>Quantum point contacts (QPCs) are cornerstones of mesoscopic physics and central building blocks for quantum electronics. Although the Fermi wave-length in high-quality bulk graphene can be tuned up to hundreds of nanometers, the observation of quantum confinement of Dirac electrons in nanostructured graphene systems has proven surprisingly challenging. Here we show ballistic transport and quantized conductance of size-confined Dirac fermions in lithographically-defined graphene constrictions. At high charge carrier densities, the observed conductance agrees excellently with the Landauer theory of ballistic transport without any adjustable parameter. Experimental data and simulations for the evolution of the conductance with magnetic field unambiguously confirm the identification of size quantization in the constriction. Close to the charge neutrality point, bias voltage spectroscopy reveals a renormalized Fermi velocity (\(v_F \approx 1.5 \times 10^6 m/s\)) in our graphene constrictions. Moreover, at low carrier density transport measurements allow probing the density of localized states at edges, thus offering a unique handle on edge physics in graphene devices.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1603.00844</doi><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | EISSN: 2331-8422 |
| ispartof | arXiv.org, 2016-04 |
| issn | 2331-8422 |
| language | eng |
| recordid | cdi_arxiv_primary_1603_00844 |
| source | arXiv.org; Free E- Journals |
| subjects | Carrier density Charge density Constrictions Current carriers Fermions Graphene Measurement Mesoscopic physics Physics - Mesoscale and Nanoscale Physics Quantum confinement Quantum electronics Resistance |
| title | Size quantization of Dirac fermions in graphene constrictions |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-09T07%3A12%3A07IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_arxiv&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Size%20quantization%20of%20Dirac%20fermions%20in%20graphene%20constrictions&rft.jtitle=arXiv.org&rft.au=Terr%C3%A9s,%20B&rft.date=2016-04-07&rft.eissn=2331-8422&rft_id=info:doi/10.48550/arxiv.1603.00844&rft_dat=%3Cproquest_arxiv%3E2080094996%3C/proquest_arxiv%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2080094996&rft_id=info:pmid/&rfr_iscdi=true |