Search for Novel Quantum Phases in Solids @ Neutral atoms in optical lattices and photonic wave guides, arrays of optomechanical elements, and electrons in solids David Hsieh

Quantum phases of matter in solids Topological protection Unconventional high-Tc superconductors Quantum ordered/disordered magnets Quantum liquid crystals Correlated insulators & Fermi/non-Fermi fluids Multipolar ordered phases Charge/spin density wave phases Coulomb interactions Lattice geometry & dimension U Kinetic hopping f t  J Spin-orbit coupling Magnetic exchange

I. Symmetry Broken Phases III. Light Induced Phases Our specific targets I. Symmetry Broken Phases II. Topological Phases III. Light Induced Phases Make intro about neutral atoms, optomechanics and electrons in solids

I. Broken Symmetries in Correlated Electron Systems Sr2IrO4 T* Pseudogap Temperature AFM insulator TN Doping d-wave gap Y. K. Kim et al., Nature Phys. 12, 37 (2016) High-Tc cuprates B. Keimer et al., Nature Review 518, 179 (2015)

Broken Symmetries via Nonlinear Optical Response Expand on mission for all sections. Give URS and Cuprate as examples of hidden order.

High Speed Nonlinear Optical Anisotropy Talk about Lauren D. H. Torchinsky et al., Rev. Sci. Instrum. 85, 083102 (2014) J. Harter, L. Niu et al., Opt. Lett. 40, 4671 (2015)

Hidden Parity-Odd Order in both Sr2IrO4 and YBa2Cu3Oy 100μm High temperature 100μm Low temperature IPS (2ω) Norm. T ( K ) TΩ  232K 2  T vs. doping phase diagram Ir O + − Complementary to Rosenbaum diffraction. Q=0 L. Zhao et al. Nature Phys. 12, 32 (2016)

Facilities Competition. Describe how we evaluate. Say that funding was for laser.

Realizing Topological Superconductors 1 - Dimension 3 - Dimensions? 2-D Majoranas on surface Observed? No! S. Sasaki et al. PRL. 107, 217001 (2011) Theoretical Calculation Bulk Surface Predicted to exist in strongly spin-orbit coupled low Tc superconductors (e.g. CuxBi2Se3 ; Tc ~ 3K,  ~ 0.6 meV) 0-D Majoranas at ends Observed? Yes! Nanowires Atomic chains

Angle-Resolved Photoemission Spectroscopy Well suited to topological insulators T ~ 10 K E ~ 10 meV

Ultracold (< 1K) + Ultrahigh energy resolution (< 1meV) ARPES Facilities Ultracold (< 1K) + Ultrahigh energy resolution (< 1meV) ARPES Record (0.8 K) achieved Best temperature.

III. Light Induced Out-of-Equilibrium Phases Floquet engineering and ultrafast detection Probe Time delay To detector Pump Talk about interactions with IQIM. Motivate this topic in general. Be careful of Oka. Something that Aditi has been working on.

Light-Induced Phases in Correlated Systems Ultrafast symmetry detection Add physical mechanism. Compare to VO2. More context and motivation.

III. Light Induced Out-of-Equilibrium Phases Talk about interactions with IQIM. Motivate this topic in general. Be careful of Oka. Something that Aditi has been working on.

Facilities

The Team Undergraduates Dr. Alberto de la Torre Dr. Liuyan Zhao Dr. John Harter Dr. Darius Torchinsky Hao Chu Tejas Deshpande New postdocs give IQIM seminars Undergraduates Kalliopi Somis Jenny Lee Mohar Chatterjee Cameron Dashwood