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UID:DSC-449
DTSTART;TZID=Europe/Berlin:20110228T163000
SEQUENCE:1299146148
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20110228T173000
URL:https://dresden-science-calendar.de/calendar/de/detail/449
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Yazdani: Helical metals on the surfaces of topological insulators
CLASS:PUBLIC
DESCRIPTION:Speaker: Ali Yazdani\nInstitute of Speaker: Princeton Universit
 y\nTopics:\nPhysik\n Location:\n  Name: MPI-PKS (Sem.rooms 1+2)\n  Street:
  Nöthnitzer Straße 38\n  City: 01187 Dresden\n  Phone: + 49 (0)351 871 0
 \n  Fax: \nDescription: Topological insulators are a new class of insulato
 rs in which a bulk gap for electronic excitations is generated by strong s
 pin-orbit coupling. These novel materials are distinguished from ordinary 
 insulators by the presence of gapless metallic boundary states\, akin to t
 he chiral edge modes in quantum Hall systems\, but with helical spin textu
 res. I will describe experiments that visualize these novel quantum states
  of matter and demonstrate their unusual properties through spectroscopic 
 mapping with the scanning tunneling microscope. Specifically experiments d
 emonstrate that spin texture of these states protect them against backscat
 tering.[1] They also demonstrate that unlike conventional surface states \
 , which are localized crystalline defects\, these state can penetrate thro
 ugh crystalline barriers. [2] I will describe these experiment and more on
 going efforts focused on unraveling the physics of topological surface sta
 tes.    [1] Roushan et al. Nature 460 1106 (2009).    [2] Seo et al. Natur
 e\, 466 434 (2010).
DTSTAMP:20261011T211419Z
CREATED:20110303T095331Z
LAST-MODIFIED:20110303T095548Z
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