Smaller is different and more：Low dimensionalsuperconductivity for new physics and applications

superconductivity for new physics and applications Antonio M. Garcia-Garcia Cavendish Laboratory, Cambridge University Tezuka Hong liu Paul chesley Bermude Pedro ribeiro MIT Harvard Cambridge Lisbon Kyoto Naion azalia Endo Mayo RIKEN TSinghua Paris, ENS Maryland Cambridge FCT EPSRC Fundacao para a Ciencia e a Tecnologia Engineering and Physical Sciences Research Council MARIE CURIE ACTIONS

Smaller is different and more: Low dimensional superconductivity for new physics and applications Antonio M. García-García Cavendish Laboratory, Cambridge University Pedro Ribeiro Lisbon Bermudez Cambridge Cazalilla Tsinghua Mayoh Cambridge Endo Paris, ENS Paul Chesler Harvard Tezuka Kyoto Hong Liu MIT Lobos Maryland Naidon RIKEN

Superconductivity For Happiness Trial and error Mavericks Superconductor 02 hole doping(p) Quantum critical points o Cuprates 100K 1986 Mueller Bednorz MgB? 39K2001 Akimitsu Fesc 50K2006 Hosono

Mavericks MgB2 39K 2001 Akimitsu Cuprates ~100K 1986 Mueller & Bednorz FeSC ~50K 2006 Hotsono Quantum critical points © Superconductivity For Happiness Trial and error

Pb 7K A1K Sn 3. 7K Nb 9,3K Librarians Thinner Cleaner 年T Smaller y DET BCS+ weak) disorder, interactions Thin films Josephson Junctions Nanowires Control

Librarians Control Pb ~7K Al ~1K Sn ~3.7K Nb ~9.3K Thinner Cleaner Smaller BCS + (weak) disorder, interactions.. Thin films Josephson Junctions Nanowires DFT

Mavericks meet librarians A revolution is going on Experimental Control Theory does not drift True Design of Materials Enhancement of superconductivity? Conventional sc in low dimensions Artificial hetero, nano-structures Novel Interfaces FeSe/sTo, Lao/sto

Enhancement of superconductivity? Mavericks meet Librarians Experimental Control Theory does not drift Conventional SC in low dimensions Artificial hetero,nano-structures Novel Interfaces FeSe/STO, LAO/STO True Design of Materials! A revolution is going on

Thin films? M图140 3.02.6400.19 Aamm 0.20 1110031 37111100.36 pb7.21.0 Abeles, Cohen, Cullen, Phys. Rev. Lett., 17, 632(1966) Crow, Parks, Douglass, Jensen, Giaver, Zeller A.M. Goldman Dynes, Tinkham

Abeles, Cohen, Cullen, Phys. Rev. Lett., 17, 632 (1966) A.M. Goldman, Dynes, Tinkham… Thin Films? Crow, Parks, Douglass, Jensen, Giaver, Zeller

Thin Films >10T Shape Resonances C 至3.*xz Fluctuations? Charge neutrality? Substrate? HICKNESS OF SLAB Wu)- Blatt, Thompson, Phys. Lett. 5, 6 (1963) Yu, et al. Rev. B 14, 996 (1976 Bermudez. AGG,Phys.Rev.B89,064508(2014)89,024510(2014)

Shape Resonances Blatt, Thompson, Phys. Lett. 5, 6 (1963) Thin Films Fluctuations? Charge neutrality? Substrate? >10Tc ! Bermudez, AGG, Phys. Rev. B 89, 064508 (2014) 89, 024510 (2014) Yu, et al.,Rev. B 14, 996 (1976)

Thinner (a) BISMUTH Smoother Pb 4.36A Disordered 00.050.10.150.20.250.3 BKT 1/d(A) Transition (b) R N S R q (anti)Vortex 7427A unbinding Bi. LLl 121620 T(K) (k9) A.M. Goldman et al PRL622180(1989) PRB475931(1993)

A.M. Goldman et al. PRL 62 2180 (1989) PRB 47 5931 (1993) Smoother Thinner Disordered Transition 𝑅𝑁 > 𝑅𝑞 BKT (anti)Vortex unbinding

2000 Atomic scale control 7.0 65 6.0 6.0 5.5 5.5 g50} 5.0 Pb 4.5 20 4.5 4.0 4.0 3.5 556057075 35 3.0 12345678910111213141516 141618202224262 Thickness (ML) Thickness N Shih et al., Science 324, 1314(2009) Xue et al., Science 306, 1915(2004) Size effects but not higher Tc

Shih et al., Science 324, 1314 (2009) Xue et al., Science 306, 1915 (2004) 2000 Atomic scale control Pb Size effects but not higher Tc

nature 3.4K LETTERS PUBLSHED ONLINE: 10 JANUARY 2010 I DO1: 10. 1038/NPHYS1499 TVSICS 3.10K 3.07 Superconductivity in one-atomic-layer metal films 28k. grown on Si(111) ⌒1261K 236K 207K1 Epitaxial 175K growth 081K 041K 4-3-2-101234 STM Bias(mv) 0.60 0 V7xV3 In 0.30 Data 0.20 BCSthe Impurities? 010}7=318K Xue 00.51015202.5303.5 Tsing T(K)

STM Epitaxial growth Impurities? Xue Tsinghua

LaAlO3/SrTiO3 interface =2 High-Tc copper oxide LaAlo-srIno g AFM V11y110 -300-200-100 200 00.020.04 0.1 0.2 Triscone et al. Nature 456 624 (2008) Mannhartet al Nature 502, 528(2013) Localization Control Exotic Quantum Tunability Matter opology

LaAlO3 /SrTiO3 interface Triscone et al. , Nature 456 624 (2008) Control Mannhart et al., Nature 502, 528 (2013) Tunability Localization Exotic Quantum Matter Topology