Thermo-electric transport in holographic systems with moment
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1 Thermo-electric Perugia 2015
2 Based on: Thermo-electric gauge/ models with, arxiv: , JHEP 1409 (2014) 160. Analytic DC thermo-electric conductivities in with gravitons, arxiv: , Phys. Rev. D 91 (2015), Bounds on intrinsic conductivities in dissipating, arxiv: with A. Amoretti, A Braggio, N. Maggiore and D. Musso.
3 Outline transport: 5 6
4 Fermi liquids and strange metals Almost all the transport properties deviate from the Fermi liquid behaviour Fermi Liquid Strange Metals ρ T 2 T e.g. Hussey review, 08 s αxy α xx T s A BT Orbetelli 92 tan θ H σxy σ xx 1 T 2 1 T 2 e.g. Hussey review, 08 Kohler s rule ρ ρ B2 ρ 2 ρ ρ tan2 θ H Harris 92
5 Linear resistivity Cuprate resistivity increases without saturation at least to 1000K. Takenaka et al. 03.
6 Quantum critical point Linear resistivity related to a critical point. Temperature is the only scale. Resistivity near a critical point (left), Cuprates (right). Analytis et al. Nature 15
7 Quantum critical point Resistivity (Pnictides) Analytis et al. Nature 15
8 Scattering rates Scattering rates of metals with T -linear resistivity. (τt ) 1 = k B / Bruin et al. Science 13
9 Mott-Ioffe-Regel (Mir) bound Drude formula: σ = ne2 τ m = k2 F e2 l 2π k F e2 h l = mean free path, τ = relaxation time. When l 1 k F, minimal conductivity or maximal resistivity. The bound is violated (not saturated) by strongly correlated systems.
10 viscosity shear viscosity η/s /(4πk B ) Kovtun, Son, Starinets 05 Other quantities saturate a bound?
11 viscosity QGP, Unitary Fermi gas, Arpes on optimally doped cuprates almost saturate the bound. Rameau et al. PRB 14
12 DC thermo-electric response Definition of the transport quantities, ( ) ( ) ( ) J σ α E = Q T α κ T κ = κ α2 T σ thermal conductivity, α Seebeck coefficient.
13 Einstein relation Charge conservation ρ t + j = 0 j = σ µ Relation between ρ and µ: ρ = χ µ Diffusion equation: ρ t = D 2 ρ, D = σ χ. Energy conservation. Diffusion equation for energy: ɛ t = D 2 ɛ, D = κ c ρ.
14 Einstein relation Diffusion equation: n A t = D AB 2 n B. n = (ρ, ɛ). The eigenvalues D + and D satisfy: D + D = σ κ χ D + + D = σ χ + κ c ρ + c ρ T (ζσ χα)2 c ρ χ 2. σ
15 Hartnoll argument Hartnoll argument Hartnoll., 14 η s ɛτ k B n k B. In a relativistic system with µ = 0, η s = D T c 2. D c 2 k B T. In the incoherent regime ( not conserved) (charge and energy) D + and D saturate the bound Hartnoll 14: D +, D C v 2 k B T
16 Holography What can be said in the framework? see also Blake & Tong 13 Donos & Gauntlett 14 Blake & Donos 14 Hartnoll & Karch 15 Blake, Donos & Lohitsiri 15
17 1 Inhomogeneous lattices: Horowitz, Santos & Tong Breaking translations to a helical Bianchi VII subgroup Donos & Gauntlett Random-field disorder Hartnoll & Herzog Breaking diffeomorphism in the bulk: Q-Lattices, axions and Donos & Gauntlett 13, Vegh 13, Andrade & Withers We use simple to solve we can obtain general physical statements
18 Massive and Breaking diffeomorphisms in the bulk by adding a mass term for the graviton S = d 4 x [ g R Λ 1 4 F 2 + β ([K] 2 [ K 2])] where K 2 ν µ f µρ g ρν, K K 2 the fixed metric f µν controls how diffeomorphisms are broken Holographic dictionary µ T µν 0 we want to dissipate but to conserve energy (elastic processes) f xx = f yy = 1, and zero otherwise
19 DC thermo-electric response in a system with a U(1) gauge field A and a killing vector t you can define two radially conserved quantities (independent on the radial AdS coordinate z) Donos & Gauntlett, 14 concerning the DC response, these two quantities can be identified with the electric current J i and the heat current Q i T ti µj i at the conformal boundary z = 0 due to their radial independence we can express these quantities in terms of horizon data (thermodynamics)
20 DC thermo-electric response The DC electric conductivity σ DC splits into two parts Blake & Tong, 13 σ DC = σ ccs + ρ2 τ E + P The thermal κ DC and thermoelectric α DC DC conductivity are affected only by the Drude part A.A. et al., 14 α DC = Sρτ E + P κ DC = S2 T τ E + P
21 DC thermo-electric response In the hydrodynamic regime ( β T 2 ) a rate τ 1 can be defined Davison, 13 t T tt = 0, t T ti = τ 1 T ti τ 1 Sβ 2π(E + P)
22 D c = σ 4π χ = 2 T 2 3β 2πT β D h = κ 4π = 2 T 2 3β. c ρ β no bound in the simple model.,
23 The dilaton model Dilaton model Gubser, Rocha 10, Davison, Schalm, Zaanen 14 The action of the dilaton model g[r e φ S d = + 6cosh(φ) 4 F µνf µν 3 2 µφ µ φ + M β (g)] + S c.t.,
24 The dilaton model The solution: ds 2 = g(z) A t = z 2 ( h(z)dt 2 + 3Q(Qz h + 1) z h ( 1 + dz 2 ) g(z) 2 h(z) + dx 2 + dy 2 βz 2 h (Qz h + 1) 2 φ(z) = 1 3 log g(z), g(z) = (1 + Qz) 3 2, h(z) = 1 + βz 2 (Qz + 1) 2 z3 (Qz h + 1) 3 zh 3 (Qz + 1)3 ) zh z z h (Qz + 1), ( βz 2 ) h 1 + (Qz h + 1).,
25 Thermodynamic quantities T = 3(1 + Qz h) 2 + βz 2 h 4π(1 + Qz h ) 3 2 z h, S = 4π (Qz h + 1) 3 2, µ = z 2 h 3Q(Qz h + 1) z h ρ = µ z h (Qz h + 1). ( 1 + βzh 2 ) (Qz h + 1) 2,
26 Transport quantities ( ) ) 2 2β (Qz h + 1) 3Qz h (β Q zh σ = 2β, Qz h ) 3π Q (Qz h + 1) (Q (Qz h + 2) + βz h + 1 zh α =, βz h κ = 4π (Qz h + 1) ( 3 (Qz h + 1) 2 + βzh 2 ) zh 2 (βz h (Qz h 2) + 3Q (Qz h + 1) 2 ).
27 The critical limit Strange metal phase at high T µ. Let us consider µ = 0. A trivial solution Q = 0 and a non trivial solution Qz h + 1 = β 1/2 z h. T = β 1/4, ρ = 0, S = 8π 2 β 1/2 T 2πz 1/2 h The susceptibilities: ζ = 0, χ = β 1/2, c ρ = 2π β 1/2 T The transport coefficients: ρ = 2π β 1/2 T, s = 0, κ = 16π 2 β 1/2 T 2
28 The D cr c = σ χ = 1 2πT The incoherent regime: T β 0 the sum: D cr h D cr h + Dcr c 1 2πT = k c ρ = 2πT β. See also Kovtun, 15 where a bound on the sum was proposed.
29 At finite density thermodynamics and transport are intimately related. Sum of Diffusion seems to be bounded in a specific model. Study the system in presence of a magnetic field : new measurable quantities (Nerst,...). To get phenomenological insight we need data clean from spurious effects: working directly with experimentalists!.
30
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