Self-generated electron glasses in frustrated organic crystals Louk Rademaker (Kavli Institute for Theoretical Physics, Santa Barbara) Leiden University,

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Self-generated electron glasses in frustrated organic crystals Louk Rademaker (Kavli Institute for Theoretical Physics, Santa Barbara) Leiden University, 4 December 2014

In collaboration with: Vladimir Dobrosavljevic (FSU) Samiyeh Mahmoudian (FSU) Simone Fratini (Institut Neel, FR) Arnaud Ralko (Institut Neel, FR)

Solid States Crystals… Crystalline SiO 2 T m ~ 2000 K Supercooled liquid SiO 2 T g ~ 1400 K

Supercooling a liquid

Supercool properties Loss of ergodicity at glass transition Typical dynamical timescale for probing the phase-space is given by Arrhenius Law: Slow dynamics governed by transitions from one metastable state to another, barrier Δ 1903

Electronic States Gas: free Fermi gas Liquid: Landau Fermi liquid Solid: Wigner crystal, or charge-density-wave Electron glass: Disorder! - Anderson Localization - Many Body Localization

Disorder-free electron glass? Ref: Kagawa et al., Nat. Phys. 9, 413 (2013) (and Sato et al, JPSJ 2014; Sato et al, PRB 2014) Material: Clean θ-(BEDT-TTF) 2 RbZn(SCN) 4

Resistivity data Electron solid: Stripe order Supercool electron liquid!

Dynamical timescale Equilibration experiments Noise spectroscopy Arrhenius Law!

Local Charge clusters Conclusion: “Charge-cluster glass” X-ray studies of electronic order ‘Local’ order: not long- range

Let’s do theory Starting point is spinless interacting electrons Program: – Classical ground state (Variational Monte Carlo) – Quantum ground state (Exact Diagonalization) – Slow glassy dynamics (Metropolis Monte Carlo)

Short-range interactions Degeneracy of ground states (residual entropy!) Zigzag StripesStraight StripesThree sublattice structure

Pinball liquid Taking quantum effects into account Hotta & Furukawa, PRB 2006 Non-Fermi liquid with coexistence of localized and itinerant electrons Ref: Merino, Ralko, Fratini, PRL 2013

Long-range interactions Pinball liquid is not θ-RbZn ground state Battle the frustration by more frustration: Known to cause self-generated glassiness and to stabilize stripe order Ref: Schmalian & Wolynes, PRL 2001; Rademaker et al, PRE 2013

Long-range interactions Linear stripes are lowest in energy: Energy differences extremely small Yet: linear stripes are robust!

Exact diagonalization

Finite Temperature Monte Carlo Metropolis: accept local move with probability Infinite range interactions on finite lattice?Ewald summation:

Stripe charge order Spinodal temperature T s = 0.04V Below T s local update MC becomes non-ergodic

Relaxation Time Autocorrelation function If system equilibrates Exponential tail of C(t) gives relaxation time

Relaxation Time Arrhenius law, Δ = 0.2V

Aging & Memory Below T s aging scaling

Density Correlations

Conclusion θ-RbZn is a self-generated glass (no disorder) Due to frustration between long-range interaction and triangular lattice Effective classical model explains: – Arrhenius relaxation behavior – Local charge clusters