Transcript Anderson Localization (1957)

Sangita Bose, Bombay
Welcome !!!
Antonio Bianconi, Rome
A. Garcia-Garcia, Cambridge
Carbon
Superconductors
STO/LAO
Heterostructures
Mesoscopic effects in
conventional
superconductors
High Tc
heterostructures
<< BCS
≥ No BCS
Enhancement?
How to enhance
SC substantially?
$10
Question
Mechanism of SC
in cuprates?
?
6
$10
Question
Why
control?
Grains and thin films in
conventional superconductors
Thin films
Abeles, Cohen, Cullen, Phys. Rev. Lett., 17, 632 (1966)
A.M. Goldman, Giaver.....
Thin Films  <  Single grains
Shape Resonances
Blatt, Thompson
Phys. Lett. 5, 6 (1963)
Shell Effects
Parmenter, Phys. Rev. 166,
392 (1967)
Ralph, Black,Tinkham,
Superconductivity in
Single Metal Particles
PRL 74, 3241-3244 (1995).
No isolated,
size/shape
unknown
Theory
beyond BCS
~
Fluctuations
Richardson
Equations
J. von Delft et al., Phys. Rep., 345, 61 (2001)
Thin Films
>
Shih et al., Science 324, 1314 (2009)
PRB 74 132504 (2006)
atomic scale control of the
thickness over a
macroscopic area
Xue et al., Science 306, 1915 (2004)
Shanenko, Peeters, PRB 75 014519 (2007)
Islands
?
Schneider, et al.,
PRL 102, 207002 (2009)
PRL 108, 126802 (2012)
Theory:
Ribeiro, AGG. PRL 108, 097004
(2012)
?
Grains
Sn
S. Bose, AGG., Nature Materials 9,
550 (2010), PRB 84 104525 (2011)
Pb
Theory:
PRL 108, 097004 (2012)
PRL 100, 187001 (2008)
PRB, 74, 052502 (2006)
SMS
Josephson
junctions
Spin Filtered
Mason, Goldbart et al, Nature
Physics 8 59 (2012)
Kresin, Deutscher
Blamire et al, Nature Materials 10
849 (2011)
+Experimental
Control
No
Control
High Tc
superconductors?
+Predictive
power
Theoreticians
Drift
Quantum size
effects in high Tc
Stripes
Blatt’s Shape
resonances for
high Tc SC
Bianconi, et al. Solid State
Comm, 89, 933 (1994)
Bianconi, Perali, at al, Solid
State Comm, 100, 181 (1996)
>
Cuprates high Tc Heterostructures
Why?
Bozovic et al., Nature 455, 782 (2008)
SC 1 Single Layer
Intrinsic inhomogeneities
Iron Pnictides
Heterostructures
Xue et al.: Arxiv: 12015694
Enhancement of
Tc by disorder
Fractal distributions
of dopants enhance
Tc in cuprates
Bianconi, et al., Nature 466, 841 (2010)
Inhomogeneities
Higher Tc
PRL 108, 017002 (2012)
LaAlO3 /SrTiO3
Heterostructures
Control &Tunability
Spin-Orbit
Disorder
Magnetism
E Field effect
Triscone, Nature 456 624 (2008)
Lesueur, arXiv:1112.2633
PRL 104, 126803 (2010)
PRB 85 020457 (2012)
Anderson, Mott
Localization
Exotic Quantum
Matter
Carbon nanotubes
<
Fluctuations
High Tc?
Phase Slips
Lehtinen, PRB 85 094508 (2012)
How to suppress
fluctuations?
Ropes
Phys. Rev. Lett. 86, 2416 (2001)
Dissipation
PRB 80, 214515 (2009)
Electric field effect
Yang,PRB 74 155414 (2006)
Single
Science 292, 2462 (2001)
CONTROL
Theory
PREDICTIVE
POWER
Enhancement = $106
Conference dinner
Tomorrow, 7:30PM
Everybody is invited!
THANKS!
Lunch < 1:45PM
Talks on time!