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Proximity Effect!!! Oded Millo STM I=1Ma 0.2 MPS H=0.4 T Disilane H=1.0 T 0.0 Hex Disilane H=1.1 T

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Proximity Effect!!! Oded Millo STM I=1Ma 0.2 MPS H=0.4 T Disilane H=1.0 T 0.0 Hex Disilane H=1.1 T Proximity Effect in Hybrid Superconducting/Organic molecule nano particle system Yossi Paltiel Applied Physics Department Center for nano science and nano technology, HUJI, Israel Oded Millo Nadav Katz Quantum Nano Engineering Lab 10/23/2015 1 L a b Many thanks to Our Group: Dr. Shira Yochelis, Eyal Cohen, Eran Katzir, Avner Neubauer, Guy Koplovitz, Oren Ben Dor, Ido Eisnberg, Ohad Westrich, Matan Galanty. Nir Sukenick, Chen Alpern; Amir Ziv, Aviya Perlman Illouz, Kuti Uliel And Grzegorz Jung Physics department , Ben Gurion University Beer Sheva Israel Ron Naaman Department of Chemical Physics, Weizmann Institute, Rehovot 76100, Israel Nadav Katz, Yaov Kalcheim, Oded Millo , Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel Uri Banin Department of physical chemistry , Hebrew University, Jerusalem 91904, Israel Financing:, ISF, ISF-BICORA, DARPA, MOD, Israel Taiwan, Magneton Capital Nature , FTA , Peter Brojde center, MOS, Volkswagen, Leverhulme Quantum Nano Engineering Lab 10/23/2015 2 L a b Molecular Electronics Eleke Scheer break junctions A. Aviram and M. Ratner, in Annals Our work on chiral induced spintronics of the New York Academy of Sciences (1998). Quantum Nano Engineering Lab 10/23/2015 3 L a b Theory Electron transmission through molecules and molecular interfaces Review by Abraham Nitzan “Electron transmission through molecules and molecular interfaces has been a subject of intensive research due to recent interest in electron transfer phenomena underlying the operation of the scanning tunneling microscope (STM) on one hand, and in the transmission properties of molecular bridges between conducting leads on the other. In these processes the traditional molecular view of electron transfer between donor and acceptor species give rise to a novel view of the molecule as a current carrying conductor, and observables such as electron transfer rates and yields are replaced by the conductivities, or more generally by current-voltage relationships, in molecular junctions. Such investigations of electrical junctions, in which single molecules or small molecular assemblies operate as conductors constitutes a major part of what has become the active field of molecular electronics. Quantum Nano Engineering Lab 10/23/2015 4 L a b Can molecules support proximity effect? Two transport channels in parallel of electrons and holes??? Or one channel near Fermi surface??? Quantum Nano Engineering Lab 10/23/2015 5 L a b Huge difference between molecule and SC gap LUMO LUMO Small SC gap µ Small SC gap HOMO HOMO Non trivial band alignment Quantum Nano Engineering Lab 10/23/2015 6 L a b How would proximity effect change with coupling??? Co s s s s Au Quantum Nano Engineering Lab 10/23/2015 7 L a b Coupling NPs to superconductors through organic molecules E. Katzir, et al. Appl. Phys. Lett . 98 223306 ( 2011). E. Katzir, et al. Phys. Rev. Lett. 108, 107004 (2012). E. Katzir, et al. Euro-physics letters 108 37006 (2014). superconductors plays the role of the “known” system 1) Transport through molecules can be studied using the superconductors. 2) We can change the superconducting surface using the hybrid layers. Quantum Nano Engineering Lab 10/23/2015 8 L a b Introduction to superconductivity Characteristics of superconductors. Superconductor material has ZERO electrical resistance. H.K Onnes 1911 1957 BCS theory : Bardeen, Cooper, Schrieffer- Superconductivity as a microscopic effect caused by a "condensation" of pairs of electrons. Cooper pairs 1986 Johannes Georg Bednorz and Karl Alexander Müller - High Tc Non BCS Quantum Nano Engineering Lab 10/23/2015 9 L a b This talk is related to the 4th superconductors Nobel price The Nobel Prize in Physics 2003 Alexei A. Abrikosov, Vitaly L. Ginzburg, Anthony J. Leggett Abrikosov- The sensing technique 1.0 1.02 1.00 0.8 Ginzburg – Motivation 0.98 0.6 0.96 6.5 7.0 7.5 8.0 RESISTANCE (arbitrary units) T [K] 0.4 I=1mA H=0.4 T 0.2 Leggett Explanation? MPS DiSilane 0.0 Hex Disilane RESISTANCE units)(arbitrary 6.0 6.5 7.0 7.5 T [K] Quantum Nano Engineering Lab 10/23/2015 10 L a b Type II superconductivity – Mixed state Hc2 Abrikosov Vortex solid Hc1 Meissner State B = 0 - M H Quantum Nano Engineering Lab 10/23/2015 11 L a b Current transport through Abrikosov Vortex lattice Lorentz Force• F = J × B Causes vortex motion• Electric field E = v X B Can not carry any bulk current Quantum Nano Engineering Lab 10/23/2015 12 L a b Pinning ; Schematic illustrations of 3 different vortex pinning scenarios. (a) Negligible pinning; vortices form a lattice. (b) Strong pinning, large anisotropy. (c) Strong pinning, small anisotropy. FROM Jenny Hoffman (Harvard) . Quantum Nano Engineering Lab 10/23/2015 13 L a b Peak effect (NbSe2) Small Angle Neutron Scattering (SANS) gives structure of the vortex lattice H Below peak – Long Neutron beam range order exists Correlation volume Vc is large 12 T = 5 K E = 1mV/cm 10 Above peak – 8 No long range order 6 Vc is small (mA) c I 4 2 Peak effect Low T materials 0 c 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 H H (T) X. S. Ling et al, PRL T Quantum Nano Engineering Lab 10/23/2015 14 L a b Proximity Effect in superconductors Andreev reflection Quantum Nano Engineering Lab 10/23/2015 15 L a b Our System Disilane molecules Nb film Sapphire Substrate MPS DiSilane Hex DiSilane Top view Quantum Nano Engineering Lab 10/23/2015 16 L a b Peak effect as a coupling sensor 1.02 1.0 1.0 1.02 H=1.1 T H=1.0 T H=0.4 T 1.001.01 0.8 1.00 We are pleased to inform you that your article, 0.8 0.98 0.99 "Using the peak effect to pick the good 0.6 0.96 6.50.98 7.0 7.5 8.0 0.6 5.0 5.5 6.0 6.5 7.0 7.5 RESISTANCE (arbitrary units) T [K] organic couplers," published in Appl. Phys. 0.4 I=1mARESISTANCE (arbitrary units) T [K] Lett. 98, 223306 (2011) 0.4H=0.4 T has been selected for the June 2011 issue of 0.2 I=1mA MPS APL: Organic Electronics and Photonics 0.2 DiSilane MPS H=0.4 T 0.0 Hex DiSilaneDisilane H=1.0 T Hex DiSilane H=1.1 T RESISTANCE units)(arbitrary 0.06.0 6.5 7.0 7.5 RESISTANCE units)(arbitrary 3 4 5 6 7 T [K] T [K] Quantum Nano Engineering Lab 10/23/2015 17 L a b STM Results 1 D = 0 . 81 meV 1.0 1.02 0 H=1.1 T H=1.0 T H=0.4 T 4 0 4 1.01 MPS 0.8 1.00 0.99 AFM of Au dot 0.98 0.6 5.0 5.5 6.0 6.5 7.0 7.5 RESISTANCE (arbitrary units) T [K] 0.4 I=1mA 0.2 Proximity MPS H=0.4 T effect!!! Oded Millo STM DiSilane H=1.0 T 0.0 Hex DiSilane H=1.1 T RESISTANCE units)(arbitrary 3 4 5 6 7 T [K] Quantum Nano Engineering Lab 10/23/2015 18 L a b We do have proximity effect!!! We have proximity effect through a molecule when the coupling is strong (small policemen is helping)!!! What will happened in the weak coupling regime? What will happened if we changed to high Tc materials? What will happened if we take magnetic nano particles? Can we have proximity effect with chiral molecules, Where no standard Andreev reflection can occur? Quantum Nano Engineering Lab 10/23/2015 19 L a b Surprise-Weak coupling limit improving superconductors 50nm Nb film 150nm Nb film clean sample 6 disilane and 10nm ] 4 [ T /d MPS R and 5nm d 2 disilane H=0 Oe and 5nm I=2 mA 0 0.85 0.90 0.95 1.00 1.05 1.10 Normalized crtical temperature MPS OTS Quantum Nano Engineering Lab 10/23/2015 20 L a b Control linkers experiments 1.0 4 Before Attachment Vthreshold=0.5 mV 0.15 H=0 Oe After OTS Attachment 3 H=0 Oe 0.8 2 Ic [mA] I=2 mA I = 2mA 1 H=0 Oe 0.10 0.6 7.4 7.6 7.8 8.0 8.2 8.4 T [K] ] 0.4 R 0.05 R[ After Attachment Clean 1st Clean 2nd 0.2 Clean 3rd Before Attachment 0.00 0.0 7.5 8.0 8.5 9.0 7.2 7.6 8.0 8.4 T[K] T [K] Non linking OTS molecules Density of gold NPs changes Quantum Nano Engineering Lab 10/23/2015 21 L a b Above and below Tc 15K 2711 on Dot IV SM2:4K27DTIV 600 400 4K 200 0 Current (pA) -200 -400 -600 -30 -20 -10 0 10 20 30 Sample Bias [mV] Quantum Nano Engineering Lab 10/23/2015 22 L a b Matching Fields 1.0 After Attachment Before Attachment 0.8 H=9000 Oe Tc=6.6K Tc=6.65K 0.6 I=2mA ] 0.4 R[ 0.2 0.0 6.2 6.4 6.6 6.8 7.0 T [K] 1.0 After Attachment Before Attachment 0.8 H=0 Oe I=2mA Tc=7.65K Tc=7.9K 0.6 ] 0.4 R[ Vortex-Rectification Effects in Films with Periodic Asymmetric 0.2 Pinning, J. Van de Vondel, C. C. de Souza Silva, B.Y. Zhu, M.
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