Zero-bias spin separation
The generation, manipulation and detection of spin-polarized electrons in low-dimensional semiconductors are at the heart of spintronics. Pure spin currents, that is, fluxes of magnetization without charge current, are quite attractive in this respect. A paradigmatic example is the spin Hall effect,...
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| Veröffentlicht in: | Nature physics 2006-09, Vol.2 (9), p.609-613 |
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| creator | Ganichev, Sergey D Bel'kov, Vasily V Tarasenko, Sergey A Danilov, Sergey N Giglberger, Stephan Hoffmann, Christoph Ivchenko, Eougenious L Weiss, Dieter Wegscheider, Werner Gerl, Christian Schuh, Dieter Stahl, Joachim De Boeck, Jo Borghs, Gustaaf Prettl, Wilhelm |
| description | The generation, manipulation and detection of spin-polarized electrons in low-dimensional semiconductors are at the heart of spintronics. Pure spin currents, that is, fluxes of magnetization without charge current, are quite attractive in this respect. A paradigmatic example is the spin Hall effect, where an electrical current drives a transverse spin current and causes a non-equilibrium spin accumulation observed near the sample boundary. Here we provide evidence for an another effect causing spin currents which is fundamentally different from the spin Hall effect. In contrast to the spin Hall effect, it does not require an electric current to flow: without bias the spin separation is achieved by spin-dependent scattering of electrons in media with suitable symmetry. We show, by free-carrier absorption of terahertz (THz) radiation, that spin currents flow in a wide range of temperatures. Moreover, the experimental results provide evidence that simple electron gas heating by any means is already sufficient to yield spin separation due to spin-dependent energy-relaxation processes. |
| doi_str_mv | 10.1038/nphys390 |
| format | Article |
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Pure spin currents, that is, fluxes of magnetization without charge current, are quite attractive in this respect. A paradigmatic example is the spin Hall effect, where an electrical current drives a transverse spin current and causes a non-equilibrium spin accumulation observed near the sample boundary. Here we provide evidence for an another effect causing spin currents which is fundamentally different from the spin Hall effect. In contrast to the spin Hall effect, it does not require an electric current to flow: without bias the spin separation is achieved by spin-dependent scattering of electrons in media with suitable symmetry. We show, by free-carrier absorption of terahertz (THz) radiation, that spin currents flow in a wide range of temperatures. Moreover, the experimental results provide evidence that simple electron gas heating by any means is already sufficient to yield spin separation due to spin-dependent energy-relaxation processes.</description><identifier>ISSN: 1745-2473</identifier><identifier>EISSN: 1745-2481</identifier><identifier>DOI: 10.1038/nphys390</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>Atomic ; Classical and Continuum Physics ; Complex Systems ; Condensed Matter Physics ; Electric currents ; Electrons ; letter ; Magnetism ; Mathematical and Computational Physics ; Molecular ; Optical and Plasma Physics ; Particle physics ; Physics ; Physics and Astronomy ; Semiconductors ; Theoretical ; Thermodynamics</subject><ispartof>Nature physics, 2006-09, Vol.2 (9), p.609-613</ispartof><rights>Springer Nature Limited 2006</rights><rights>Copyright Nature Publishing Group Sep 2006</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c377t-426531b37116ffc488afa3921e1533ae395cb0fb8ee4135a1f6b6b7346d1ee883</citedby><cites>FETCH-LOGICAL-c377t-426531b37116ffc488afa3921e1533ae395cb0fb8ee4135a1f6b6b7346d1ee883</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,2727,27924,27925</link.rule.ids></links><search><creatorcontrib>Ganichev, Sergey D</creatorcontrib><creatorcontrib>Bel'kov, Vasily V</creatorcontrib><creatorcontrib>Tarasenko, Sergey A</creatorcontrib><creatorcontrib>Danilov, Sergey N</creatorcontrib><creatorcontrib>Giglberger, Stephan</creatorcontrib><creatorcontrib>Hoffmann, Christoph</creatorcontrib><creatorcontrib>Ivchenko, Eougenious L</creatorcontrib><creatorcontrib>Weiss, Dieter</creatorcontrib><creatorcontrib>Wegscheider, Werner</creatorcontrib><creatorcontrib>Gerl, Christian</creatorcontrib><creatorcontrib>Schuh, Dieter</creatorcontrib><creatorcontrib>Stahl, Joachim</creatorcontrib><creatorcontrib>De Boeck, Jo</creatorcontrib><creatorcontrib>Borghs, Gustaaf</creatorcontrib><creatorcontrib>Prettl, Wilhelm</creatorcontrib><title>Zero-bias spin separation</title><title>Nature physics</title><addtitle>Nature Phys</addtitle><description>The generation, manipulation and detection of spin-polarized electrons in low-dimensional semiconductors are at the heart of spintronics. Pure spin currents, that is, fluxes of magnetization without charge current, are quite attractive in this respect. A paradigmatic example is the spin Hall effect, where an electrical current drives a transverse spin current and causes a non-equilibrium spin accumulation observed near the sample boundary. Here we provide evidence for an another effect causing spin currents which is fundamentally different from the spin Hall effect. In contrast to the spin Hall effect, it does not require an electric current to flow: without bias the spin separation is achieved by spin-dependent scattering of electrons in media with suitable symmetry. We show, by free-carrier absorption of terahertz (THz) radiation, that spin currents flow in a wide range of temperatures. Moreover, the experimental results provide evidence that simple electron gas heating by any means is already sufficient to yield spin separation due to spin-dependent energy-relaxation processes.</description><subject>Atomic</subject><subject>Classical and Continuum Physics</subject><subject>Complex Systems</subject><subject>Condensed Matter Physics</subject><subject>Electric currents</subject><subject>Electrons</subject><subject>letter</subject><subject>Magnetism</subject><subject>Mathematical and Computational Physics</subject><subject>Molecular</subject><subject>Optical and Plasma Physics</subject><subject>Particle physics</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>Semiconductors</subject><subject>Theoretical</subject><subject>Thermodynamics</subject><issn>1745-2473</issn><issn>1745-2481</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNpl0E1LxDAQBuAgCq5V8OpFFi_qoZrppE16lMUvWPCiFy8hrRPt0k1r0h7239ulWkRPM4eHd4aXsWPgV8BRXbv2YxMw5ztsBlKkcSIU7E67xH12EMKKc5FkgDN28kq-iYvKhHloKzcP1Bpvuqpxh2zPmjrQ0feM2Mvd7fPiIV4-3T8ubpZxiVJ28ZCTIhQoATJrS6GUsQbzBAhSREOYp2XBbaGIBGBqwGZFVkgU2RsQKYUROx9zW9989hQ6va5CSXVtHDV90FJgKvMkh0Ge_ZGrpvdueE5DLjLJtxcjdjGi0jcheLK69dXa-I0GrrcN6Z-GBno50jAQ907-V95_ezpaZ7re0xQ6gS_vtXBm</recordid><startdate>20060901</startdate><enddate>20060901</enddate><creator>Ganichev, Sergey D</creator><creator>Bel'kov, Vasily V</creator><creator>Tarasenko, Sergey A</creator><creator>Danilov, Sergey N</creator><creator>Giglberger, Stephan</creator><creator>Hoffmann, Christoph</creator><creator>Ivchenko, Eougenious L</creator><creator>Weiss, Dieter</creator><creator>Wegscheider, Werner</creator><creator>Gerl, Christian</creator><creator>Schuh, Dieter</creator><creator>Stahl, Joachim</creator><creator>De Boeck, Jo</creator><creator>Borghs, Gustaaf</creator><creator>Prettl, Wilhelm</creator><general>Nature Publishing Group UK</general><general>Nature Publishing Group</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7U5</scope><scope>7XB</scope><scope>88I</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>L7M</scope><scope>M2P</scope><scope>P5Z</scope><scope>P62</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope></search><sort><creationdate>20060901</creationdate><title>Zero-bias spin separation</title><author>Ganichev, Sergey D ; 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Pure spin currents, that is, fluxes of magnetization without charge current, are quite attractive in this respect. A paradigmatic example is the spin Hall effect, where an electrical current drives a transverse spin current and causes a non-equilibrium spin accumulation observed near the sample boundary. Here we provide evidence for an another effect causing spin currents which is fundamentally different from the spin Hall effect. In contrast to the spin Hall effect, it does not require an electric current to flow: without bias the spin separation is achieved by spin-dependent scattering of electrons in media with suitable symmetry. We show, by free-carrier absorption of terahertz (THz) radiation, that spin currents flow in a wide range of temperatures. 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| subjects | Atomic Classical and Continuum Physics Complex Systems Condensed Matter Physics Electric currents Electrons letter Magnetism Mathematical and Computational Physics Molecular Optical and Plasma Physics Particle physics Physics Physics and Astronomy Semiconductors Theoretical Thermodynamics |
| title | Zero-bias spin separation |
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