Odd-Frequency Pairing in Superconducting Heterostructures
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1 Odd-Frequency Pairing in Superconducting Heterostructures Alexander Golubov Twente University, The Netherlands Y. Tanaka Nagoya University, Japan Y. Asano Hokkaido University, Japan S. Kawabata AIST, Tsukuba, Japan
2 Contents (1)What is odd-frequency pairing (2)Normal metal / Superconductor junctions (3) Vortices in p-wave superconductors (4)Ferromagnet/Superconductor junctions
3 Conventional Classification of Symmetry of Cooper pair t3 Spin-singlet Cooper pair Even Parity s-wave BCS Spin-triplet Cooper pair d-wave Odd Parity Cuprate p-wave 3 He Sr 2 RuO 4
4 Slide 3 t3 tanaka, 7/7/2008
5 Odd-frequency pairing Fermi-Dirac statistics Symmetry of pair wave functions: (ω), ( ) f(ω) even-frequency superconductivity Momentum x Spin x Frequency Berezinskii (1974): Spin-triplet s-wave Balatsky&Abrahams (1992): Spin-singlet p-wave (ω), f(ω) odd-frequency superconductivity
6 ABS F/S junction Odd-frequency pairing Vortex Proximity (interference)
7 Pair amplitude Exchange of time Even-frequency pairing (conventional pairing) Odd-frequency pairing
8 Symmetry of the pair amplitude + symmetric, anti-symmetric Frequency (time) Spin Orbital Total ESE +(even) singlet) +(even) BCS Cuprate ETO OTE +(even) odd) + (triplet) + triplet) (odd) +(even) 3 He Sr 2 RuO 4 OSO odd) singlet) (odd) ESE (Even-frequency spin-singlet even-parity) ETO (Even-frequency spin-triplet odd-parity) OTE (Odd-frequency spin-triplet even-parity) Berezinskii OSO (Odd-frequency spin-singlet odd-parity) Balatsky, Abrahams
9 Odd-frequency pairing state is possible in inhomogeneous superconductors even for conventional even-frequency paring in the bulk Broken spin rotation symmetry or spatial invariance symmetry can induce odd-frequency pairing state: - ferromagnet/superconducor junctions: Bergeret,Volkov&Efetov, non-uniform systems: Junctions: Tanaka&Golubov, 2007; Eschrig&Lofwander, 2007 Vortices: Yokoyama et al., 2008; Tanuma et al., 2009)
10 Normal metal spin-triplet p-wave superconductor
11 Symmetry of the bulk pair potential is ETO (low-transparent) Pair potential (high-transparent) p x -wave component of ETO pair amplitude s-wave component of OTE pair amplitude ETO (Even-frequency spin-triplet odd-parity) OTE (Odd-frequency spin-triplet even-parity) Y. Tanaka, et al PRL (2007)
12 Underlying physics Near the interface, even and odd-parity pairing states (pair amplitude) can mix due to the breakdown of the translational symmetry. Fermi-Dirac statistics The interface-induced state (pair amplitude) should be odd in frequency where the bulk pair potential has an even -frequency component since there is no spin flip at the interface.
13 Andreev bound states in inhomogeneous systems are manifestations of odd-frequency pairing amplitude Andreev bound states Electron-like QP Negative pair potential Positive pair potential Hole-like QP Cooper pair Surface: Tanaka et al, 2007 Vortex : Tanuma et al, 2009 Scattering direction of QP Phase change due to a vortex
14 Mid gap Andreev resonant (bound) state (MARS) Normalized DOS ー + Local density of state has a zero energy peak. (Sign change of the pair potential at the interface) Interface (surface) ー ー Tanaka Kashiwaya PRL (1995), Rep. Prog. Phys (2000) Buchholz(1981) Hara Nagai(1986) Hu(1994) Matsumoto Shiba(1995) Ohashi Takada(1995) Hatsugai and Ryu (2002)
15 Odd-frequency pairing state in N/S junctions (N finite length) Bounds state are formed in the normal metal Y. Tanaka, Y. Tanuma and A.A.Golubov, Phys. Rev. B 76, (2007)
16 Ratio of the pair amplitude at the N/S interface and the bound state level Bound states condition (Z=0) (McMillan Thomas Rowell) Odd-frequency pairing Even-frequency pairing Bound states are due to the generation of the odd-frequency Cooper pair amplitude
17 Symmetry of the Cooper pair (No spin flip) Bulk state Sign change (MARS) Interface-induced symmetry (subdominant component ) (1) (2) (3) ESE (s,d x2-y2 -wave) ESE (d xy -wave) ETO (p x -wave) No Yes Yes ESE + (OSO) OSO +(ESE) OTE + (ETO) (4) ETO (p y -wave) No ETO + (OTE) (1) (2) (3) (4) ESE (Even-frequency spin-singlet even-parity) ETO (Even-frequency spin-triplet odd-parity) OTE (Odd-frequency spin-triplet even-parity) OSO (Odd-frequency spin-singlet odd-parity) Phys. Rev. Lett (2007)
18 Impurity scattering effect Tanaka and Golubov, PRL. 98, (2007) Ballistic Normal metal Superconductor Diffusive Normal metal (DN) Impurity scattering (isotropic) Superconductor Only s-wave pair amplitude exists in DN (1)ESE (2)OTE ESE (Even-frequency spin-singlet even-parity
19 Even frequency spin singlet even parity (ESE) pair potential DN S Even frequency spin singlet s-wave (ESE) pair is induced in DN. ESE pair /ESE pair potential
20 Odd frequency spin triplet s-wave (OTE) pair is induced in DN P x -wave case ー + Re f ( ) DN Im f ( ) New type of proximity effect Y.Tanaka, A.A.Golubov, Phys.Rev.Lett. 98, (2007)
21 Density of states in DN Conventional proximity effect with Even-frequency Cooper pair in DN Unconventional proximity effect with Odd-frequency Cooper pair in DN Tanaka&Kashiwaya, 2004
22 Summary of Proximity effect (diffusive normal metal, s-wave pairing state only) Symmetry of the pair potential Induced pair amplitude in DN Even frequency spin singlet even parity (ESE) ESE Even frequency spin triplet odd parity (ETO) Odd frequency spin triplet even parity (OTE) Odd frequency spin singlet odd parity (OSO) OTE OTE ESE
23 STS experiments Proximity effect via odd-frequency pairing Conventional proximity effect STS STS ZEP MARS No ZEP MARS Diffusive normal Metal (DN) Spin-Triplet superconductor Diffusive normal Metal (DN) Spin-Singlet superconductor LDOS in DN has a zero energy peak LDOS in DN has a gap DoS peak is robust again imputiry satterin
24 Unconventional proximity effect Odd-frequency pairing at the interface includes s-wave component No proximity effect Odd-frequency pairing at the interface: Odd-parity
25 How to detect odd-frequency paring amplitude: measuring electrical conductivity Asano, Tanaka, Golubov, Kashiwaya, PRL 99, (2007) Sr 2 RuO 4 OTE (Odd-frequency spin-triplet even-parity) Au:I+ OTE proximity ESE (Even-frequency spin-singlet even-parity) Au:V+ Kashiwaya, Maeno 2007 Au:I- Au:V- ESE proximity (conventional) Zero energy peak No Zero energy peak
26 Anomalous Meissner effect Narikiyo and Fukuyama, J. Phys. Soc. Jpn. 58, 4557 (1989) Belzig and Bruder PRB (1996)
27 Temperature dependence of averaged value of local penetration depth c d a purely imaginary number for spin-triplet junctions a b
28 How to detect anomalous Meissner effect? Surface impedance
29 Robust relation R<X holds in an even-frequency state This relation violates in an odd-frequency state at low T Y.Asano, A.A.Golubov, Ya.V.Fominov, and Y. Tanaka, PRL (2011)
30 Andreev bound states in inhomogeneous systems are manifestations of odd-frequency pairing amplitude Andreev bound states Electron-like QP Negative pair potential Positive pair potential Hole-like QP Cooper pair Surface: Tanaka et al, 2007 Vortex : Tanuma et al, 2009 Scattering direction of QP Phase change due to a vortex
31 Symmetry of the Cooper pair in a vortex core l; angular momentum m; vorticity bulk Center of the vortex core Even Even ESE (s-wave..) ESE Even Odd ESE (s-wave..) OSO Odd Even ETO (chiral p-wave) ETO Odd Odd ETO (chiral p-wave) OTE 2 2 x y x iy ( r) 0 exp( il ) tanh 2 2 x y ESE (Even-frequency spin-singlet even-parity) ETO (Even-frequency spin-triplet odd-parity) OTE (Odd-frequency spin-triplet even-parity) OSO (Odd-frequency spin-singlet odd-parity Yokoyama et al., Physical Review B, Vol. 78, , 2008 m
32 Difference of the angular momentum of the odd-frequency pair at the core center Angular momentum at the center of core; l+m l: angular momentum m: vorticity
33 Impurity effect (Born approximation) LDOS LDOS Odd-frequency s-wave Odd-frequency d-wave Odd frequency s-wave state; more robust against the impurity scattering Tanuma, Hayashi, Tanaka Golubov, PRL (2009).
34 Vortex core spectroscopy in chiral domain Parallel vortex Antiparallel vortex Parallel vortex Antiparallel vortex Odd d-wave Odd s-wave Odd d-wave Odd s-wave Weak ZEP Strong ZEP Weak ZEP Strong ZEP
35 Summary (vortices) (1)In Abrikosov vortex (m=1), only the oddfrequency Cooper pairing is possible at the center of the vortex core. (2)Vortex core spectroscopy in chiral p-wave superconductor in the presence of impurity enables one to identify the presence of chirality and the odd-frequency pairing.
36 Odd-frequency pair amplitude (not pair potential) is generated in ferromagnet junctions Odd frequency spin-triplet s-wave pair + spin-singlet s-wave pair _ Ferromagnet Superconductor Bergeret, Efetov, Volkov, (2001) Eschrig, Buzdin, Kadigrobov,Fominov, Radovic Generation of the odd-frequency pair amplitude in ferromagnet
37 Josephson current in S/HM/S Half metal : CrO 2 Keizer et.al., Nature (2006) Spin active interface Theory in the clean limit Bergeret et. al., PRL( 01), Kadigrobov et. al., Europhys Lett.( 01) Eschrig et. al., PRL( 03) Lofwander and Eschrig, Nature Physics (2008)
38 Recursive GF Furusaki, Physica B( 92), Asano, PRB( 01) Advantages SNS, SFS, S/HM/S J N S J i 1 i J J 2 J 2 Parameters V V ex S : exchange : spin-flip Y.Asano, Y. Tanaka, A.A.Golubov, Phys.Rev.Lett. 98, (2007)
39 Spin active interface V σ V S 2 SFS, S/HM/S J J self-averaging f f, f f 0, 3 f f No sign change odd-frequency pairs SFS f f 0, f, f 3 S/HM/S f only
40 Odd-frequency pairs Pairing function / f B < f 0 > < f > n / 0
41 Quasiparticle DOS in Half Metal SFS f f 0, f, f even-odd mix 3 S/HM/S f only pure odd 3 SNS Zero Energy Peak LDOS at j = 37 / n S/HM/S can be detected by tunneling spectroscopy E /
42 ABS F/S junction Odd-frequency pairing Vortex Proximity (interference)
43 Summary (1) Ubiquitous presence of the odd-frequency pairs in inhomogeneous systems. (2) Low energy Andreev bound states can be expressed in terms of odd-frequency pairing (proximity effect and vortices). (3) The origin of the anomalous proximity effect in DN/spin-triplet p-wave junction is the generation of the odd-frequency pairing state. (4) Odd-frequency triplet pairs are generated in S/F junctions.
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