스포츠 토토 판매점APCTP-POSTECH Distinguished Lecture[09.07.06]
관련링크
본문
"
“Carbon Nanotube Superconductivity: An Update”
ØSpeaker :Prof. Ping Sheng (HKUST, Clear Water Bay, Kowloon, Hong Kong)
ØPlace : #512, Hogil Kim Memorial Bldg., POSTECH
ØDate & Time : July 6 (Mon), 15:00 - 16:00
ØAbstract
Superconductivity in carbon nanotubes is a topic of intriguing interest.스포츠 토토 판매점While the small-diameter nanotubes
Are스포츠 토토 판매점predicted스포츠 토토 판매점to스포츠 토토 판매점have스포츠 토토 판매점enhanced스포츠 토토 판매점electron-phonon스포츠 토토 판매점coupling—a스포츠 토토 판매점key스포츠 토토 판매점element responsible스포츠 토토 판매점for스포츠 토토 판매점nanotube
superconductivitythe associated increase in fluctuation effects is unfavorable to the스포츠 토토 판매점manifestation스포츠 토토 판매점of스포츠 토토 판매점a
superconducting transition.스포츠 토토 판매점The possibility of a Peierls transition in thin nanotubes is a further스포츠 토토 판매점deterrent스포츠 토토 판매점to
superconductivity.스포츠 토토 판매점It스포츠 토토 판매점follows that the existence of coupling스포츠 토토 판매점between스포츠 토토 판매점the스포츠 토토 판매점nanotubes스포츠 토토 판매점is스포츠 토토 판매점important스포츠 토토 판매점to스포츠 토토 판매점the
realization of its superconducting behavior, since the transverse coherence can suppress스포츠 토토 판매점fluctuations스포츠 토토 판매점and
lower the Peierls transition temperature, thereby making the스포츠 토토 판매점appearance스포츠 토토 판매점of스포츠 토토 판매점a스포츠 토토 판매점superconducting스포츠 토토 판매점transition
possible.스포츠 토토 판매점 Owing to스포츠 토토 판매점its스포츠 토토 판매점ordered스포츠 토토 판매점and스포츠 토토 판매점closely-spaced스포츠 토토 판매점pore스포츠 토토 판매점structure (with스포츠 토토 판매점a스포츠 토토 판매점13.6스포츠 토토 판매점Å스포츠 토토 판매점center-to-center
separation between the 0.7 nm diameter pores), the AFI zeolite (composition: Al12P12O48) with embedded
4-Å carbon nanotubes constitutes an ideal material스포츠 토토 판매점for스포츠 토토 판매점the스포츠 토토 판매점observation스포츠 토토 판매점of스포츠 토토 판매점nanotube스포츠 토토 판매점superconductivity.
In this talk스포츠 토토 판매점I스포츠 토토 판매점will스포츠 토토 판매점describe스포츠 토토 판매점the스포츠 토토 판매점eight-year effort스포츠 토토 판매점that스포츠 토토 판매점resulted스포츠 토토 판매점in스포츠 토토 판매점the스포츠 토토 판매점two스포츠 토토 판매점new스포츠 토토 판매점developments스포츠 토토 판매점in스포츠 토토 판매점2007
(on improved sample fabrication) and스포츠 토토 판매점2008 (on making electrical contacts),스포츠 토토 판매점leading스포츠 토토 판매점to스포츠 토토 판매점reasonably스포츠 토토 판매점easy
observation of nanotube스포츠 토토 판매점superconductivity with high reliability스포츠 토토 판매점and스포츠 토토 판매점repeatability.스포츠 토토 판매점I n particular,스포츠 토토 판매점we스포츠 토토 판매점have
measured the specific heat signal for the superconducting transition as well as the resistive superconducting
transition.스포츠 토토 판매점The coupled carbon nanotube arrays can yield both nearly 1D superconducting behavior as well
as the Josephson array behavior, with their attendant magnetic characteristics.스포츠 토토 판매점The overall physical picture
that emerges is that of a coupled Josephson array consisting of aligned nanotubes crossing over from스포츠 토토 판매점an
individually fluctuating 1D system to a coherent 3D superconductor, mediated by a Kosterlitz-Thouless (KT)
transition which establishes quasi long range order in the lateral plane perpendicular to the스포츠 토토 판매점c-axis스포츠 토토 판매점of스포츠 토토 판매점the
nanotubes.스포츠 토토 판매점The attainment of global coherence is seen at 5K and below, accompanied by the appearance
of a well-defined supercurrent gap at 2K.스포츠 토토 판매점While the existence of the superconducting transition in nanotube
arrays is now beyond reasonable doubt, there are still many aspects스포츠 토토 판매점of스포츠 토토 판매점the스포츠 토토 판매점data스포츠 토토 판매점which스포츠 토토 판매점have스포츠 토토 판매점yet스포츠 토토 판매점to스포츠 토토 판매점be
theoretically understood.스포츠 토토 판매점I will present some important lessons learned from the eight-year effort and what
they tell us about the mesoscopic electronic states in most carbon nanotubes.스포츠 토토 판매점In particular, these lessons
may shed light on why nanotube superconductivity was not observed and/or confirmed earlier.
Contact Person : Prof. Wokyung Sung(054-279-2061, wsung@postech.ac.kr)"
“Carbon Nanotube Superconductivity: An Update”
ØSpeaker :Prof. Ping Sheng (HKUST, Clear Water Bay, Kowloon, Hong Kong)
ØPlace : #512, Hogil Kim Memorial Bldg., POSTECH
ØDate & Time : July 6 (Mon), 15:00 - 16:00
ØAbstract
Superconductivity in carbon nanotubes is a topic of intriguing interest.스포츠 토토 판매점While the small-diameter nanotubes
Are스포츠 토토 판매점predicted스포츠 토토 판매점to스포츠 토토 판매점have스포츠 토토 판매점enhanced스포츠 토토 판매점electron-phonon스포츠 토토 판매점coupling—a스포츠 토토 판매점key스포츠 토토 판매점element responsible스포츠 토토 판매점for스포츠 토토 판매점nanotube
superconductivitythe associated increase in fluctuation effects is unfavorable to the스포츠 토토 판매점manifestation스포츠 토토 판매점of스포츠 토토 판매점a
superconducting transition.스포츠 토토 판매점The possibility of a Peierls transition in thin nanotubes is a further스포츠 토토 판매점deterrent스포츠 토토 판매점to
superconductivity.스포츠 토토 판매점It스포츠 토토 판매점follows that the existence of coupling스포츠 토토 판매점between스포츠 토토 판매점the스포츠 토토 판매점nanotubes스포츠 토토 판매점is스포츠 토토 판매점important스포츠 토토 판매점to스포츠 토토 판매점the
realization of its superconducting behavior, since the transverse coherence can suppress스포츠 토토 판매점fluctuations스포츠 토토 판매점and
lower the Peierls transition temperature, thereby making the스포츠 토토 판매점appearance스포츠 토토 판매점of스포츠 토토 판매점a스포츠 토토 판매점superconducting스포츠 토토 판매점transition
possible.스포츠 토토 판매점 Owing to스포츠 토토 판매점its스포츠 토토 판매점ordered스포츠 토토 판매점and스포츠 토토 판매점closely-spaced스포츠 토토 판매점pore스포츠 토토 판매점structure (with스포츠 토토 판매점a스포츠 토토 판매점13.6스포츠 토토 판매점Å스포츠 토토 판매점center-to-center
separation between the 0.7 nm diameter pores), the AFI zeolite (composition: Al12P12O48) with embedded
4-Å carbon nanotubes constitutes an ideal material스포츠 토토 판매점for스포츠 토토 판매점the스포츠 토토 판매점observation스포츠 토토 판매점of스포츠 토토 판매점nanotube스포츠 토토 판매점superconductivity.
In this talk스포츠 토토 판매점I스포츠 토토 판매점will스포츠 토토 판매점describe스포츠 토토 판매점the스포츠 토토 판매점eight-year effort스포츠 토토 판매점that스포츠 토토 판매점resulted스포츠 토토 판매점in스포츠 토토 판매점the스포츠 토토 판매점two스포츠 토토 판매점new스포츠 토토 판매점developments스포츠 토토 판매점in스포츠 토토 판매점2007
(on improved sample fabrication) and스포츠 토토 판매점2008 (on making electrical contacts),스포츠 토토 판매점leading스포츠 토토 판매점to스포츠 토토 판매점reasonably스포츠 토토 판매점easy
observation of nanotube스포츠 토토 판매점superconductivity with high reliability스포츠 토토 판매점and스포츠 토토 판매점repeatability.스포츠 토토 판매점I n particular,스포츠 토토 판매점we스포츠 토토 판매점have
measured the specific heat signal for the superconducting transition as well as the resistive superconducting
transition.스포츠 토토 판매점The coupled carbon nanotube arrays can yield both nearly 1D superconducting behavior as well
as the Josephson array behavior, with their attendant magnetic characteristics.스포츠 토토 판매점The overall physical picture
that emerges is that of a coupled Josephson array consisting of aligned nanotubes crossing over from스포츠 토토 판매점an
individually fluctuating 1D system to a coherent 3D superconductor, mediated by a Kosterlitz-Thouless (KT)
transition which establishes quasi long range order in the lateral plane perpendicular to the스포츠 토토 판매점c-axis스포츠 토토 판매점of스포츠 토토 판매점the
nanotubes.스포츠 토토 판매점The attainment of global coherence is seen at 5K and below, accompanied by the appearance
of a well-defined supercurrent gap at 2K.스포츠 토토 판매점While the existence of the superconducting transition in nanotube
arrays is now beyond reasonable doubt, there are still many aspects스포츠 토토 판매점of스포츠 토토 판매점the스포츠 토토 판매점data스포츠 토토 판매점which스포츠 토토 판매점have스포츠 토토 판매점yet스포츠 토토 판매점to스포츠 토토 판매점be
theoretically understood.스포츠 토토 판매점I will present some important lessons learned from the eight-year effort and what
they tell us about the mesoscopic electronic states in most carbon nanotubes.스포츠 토토 판매점In particular, these lessons
may shed light on why nanotube superconductivity was not observed and/or confirmed earlier.
Contact Person : Prof. Wokyung Sung(054-279-2061, wsung@postech.ac.kr)"
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