'Quantum Hall-like effect' found in a bulk material without an applied magnetic field


	'Quantum Hall-like effect' found in a bulk material without an applied magnetic field

rj3sp

4-25-2008 10:36 AM

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rj3sp says:

A team of scientists from Princeton University has found that the so called quantum Hall effect, which is observed in two-dimensional electron systems subjected to low temperatures and strong magnetic fields can occur in a bulk crystal of bismuth-antimony without any external magnetic field being present.
This work, could lead to advances in new kinds of fast computing devices, of potential use in future electronic technologies.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/51557270-53a7-4294-becd-aeeb3a6d70c4/DB67C606-6618-4602-8B67-5EACA319BAD3/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.princeton.edu/main/news/archive/S20/90/55G21/index.xml?section=topstories" href="http://www.princeton.edu/main/news/archive/S20/90/55G21/index.xml?section=topstories" style="font-size: 11px;">www.princeton.edu</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.princeton.edu/main/news/archive/S20/90/55G21/index.xml?section=topstories"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.princeton.edu/img/D5A555D9-2CD5-4041-B53F-E5C2EF4E2D96" alt="Princeton University" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.princeton.edu/main/news/archive/S20/90/55G21/index.xml?section=topstories"><H2>Princeton scientists discover exotic quantum state of matter</H2></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.princeton.edu/main/news/archive/S20/90/55G21/index.xml?section=topstories"><I>'Quantum Hall-like effect' found in a bulk material without an applied magnetic field</I></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.princeton.edu/main/news/archive/S20/90/55G21/index.xml?section=topstories"><DIV>
The images observed by the Princeton group provide the first direct evidence for quantum Hall-like behavior without external magnetic fields.</DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.princeton.edu/main/news/archive/S20/90/55G21/index.xml?section=topstories"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.princeton.edu/img/AC08D9D2-43CE-44FA-9A1E-AD176D3976B8" alt="Quantum Hall effect" /></div></blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content8.clipmarks.com/images/clip-icon.gif" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://en.wikipedia.org/w/index.php?title=Hall_effect&oldid=205828802" href="http://en.wikipedia.org/w/index.php?title=Hall_effect&oldid=205828802" style="font-size: 11px;">en.wikipedia.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Hall_effect&oldid=205828802"><SPAN>Hall effect</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Hall_effect&oldid=205828802"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/en.wikipedia.org/img/FD8DB262-2262-4745-A4D7-D303B7FE9694" alt="Hall effect diagram, showing electron flow (rather than conventional current). Legend: 1. Electrons (not conventional current!) 2. Hall element, or Hall sensor 3. Magnets 4. Magnetic field 5. Power source Description:  In drawing "A", the Hall element takes on a negative charge at the top edge (symbolised by the blue color) and positive at the lower edge (red color). In "B" and "C", either the electric current or the magnetic field is reversed, causing the polarization to reverse. Reversing both" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Hall_effect&oldid=205828802">
In drawing "A", the Hall element takes on a negative charge at the top edge (symbolised by the blue color) and positive at the lower edge (red color). In "B" and "C", either the electric current or the magnetic field is reversed, causing the polarization to reverse. Reversing both current and magnetic field (drawing "D") causes the Hall element to again assume a negative charge at the upper edge.</blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content6.clipmarks.com/images/clip-icon.gif" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://en.wikipedia.org/w/index.php?title=Quantum_Hall_effect&oldid=207856012" href="http://en.wikipedia.org/w/index.php?title=Quantum_Hall_effect&oldid=207856012" style="font-size: 11px;">en.wikipedia.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Quantum_Hall_effect&oldid=207856012"><SPAN>Quantum Hall effect</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Quantum_Hall_effect&oldid=207856012">The <B>quantum Hall effect</B> (or <B>integer quantum Hall effect</B>) is a <A title="Quantum mechanics" href="http://en.wikipedia.org/wiki/Quantum_mechanics">quantum-mechanical</A> version of the <A title="Hall effect" href="http://en.wikipedia.org/wiki/Hall_effect">Hall effect</A>, observed in <A title="2DEG" href="http://en.wikipedia.org/wiki/2DEG">two-dimensional electron systems</A> subjected to low <A title="Temperature" href="http://en.wikipedia.org/wiki/Temperature">temperatures</A> and strong <A title="Magnetic field" href="http://en.wikipedia.org/wiki/Magnetic_field">magnetic fields</A>,</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/DB67C606-6618-4602-8B67-5EACA319BAD3/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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