Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 510)
Virtual (March 2022); Time Zone: Pacific Time
Session G37: Emergent Phenomena in Correlated and Topological Square netsInvited

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Sponsoring Units: DCMP Chair: Leslie Schoop, Princeton University Room: Room 233 
Tuesday, March 7, 2023 11:30AM  12:06PM 
G37.00001: Electronic signatures of quasiparticles in highT_{c} ironchalcogenide superconductors under pressure Invited Speaker: Amalia I Coldea Ironchalcogenide superconductors of the FeSe family provide an exciting platform to investigate the hightemperature superconductivity that often emerges from intertwined electronic nematic and spindensity wave orders. Tuning parameters, such as applied pressure and chemical pressure [1,2], can be used to explore the phase diagram and establish the characteristics of the normal quasiparticles. In this talk, I will present quantum oscillations studies under high applied hydrostatic pressure in single crystals of FeSe_{1x}S_{x} using magnetotransport and tunnel diode oscillator experiments up to 45T [3,4,5]. I will discuss the evolution of the Fermi surface and the quasiparticle effective masses in the vicinity of the nematic end point as well as inside the highpressure phase where superconductivity is enhanced. I will compare phase diagrams of different systems and discuss the role of Cu impurity scattering [6,7]. These studies emphasize the robustness of the highT_{c} superconducting phase, the role of electronic correlations as well as the characteristics of the anomalous normal electronic phases. 
Tuesday, March 7, 2023 12:06PM  12:42PM 
G37.00002: Materials search algorithms for square net Dirac materials Invited Speaker: Jennifer Cano Square net materials can exhibit Dirac nodal lines, as exemplified by ZrSiS, whose striking linear dispersion spans 2eV. Since the discovery of ZrSiS, there has been a search to find more square net Dirac materials. To this end, we derived a symmetry classification of square nets, which reveals that the glide symmetry in ZrSiS is not necessary to protect a Dirac crossing. We use our classification to derive a materials search algorithm, predicting new square net materials in both symmorphic and nonsymmorphic space groups. We further derive a geometric tolerance factor to refine the materials search. Finally we discuss correlated square net materials. 
Tuesday, March 7, 2023 12:42PM  1:18PM 
G37.00003: TBD Invited Speaker: Ekaterina Pomjakushina

Tuesday, March 7, 2023 1:18PM  1:54PM 
G37.00004: Ultrafast dynamics of vortex strings in a charge density wave Invited Speaker: Mariano Trigo Excitation of materials with ultrafast light pulses can induce novel states of matter not accessible in thermodynamic equilibrium. Visualizing the pathways of transformation into those transient states can inspire rational ways to control materials’ functionality. Fast nonadiabatic transients between two structures typically leads to proliferation of topological defects, which govern the return to equilibrium as well as the metastability of competing orders in systems with intertwined orders. Yet, the dynamics of these defects in ultrafast phase transitions have been elusive. 
Tuesday, March 7, 2023 1:54PM  2:30PM 
G37.00005: Electrodynamics of hidden quasiparticle and plasmons in nodalsquares Invited Speaker: Yinming Shao The discovery of nodalline semimetal ZrSiS extends the notion of Dirac fermions from points to lines and loops in the momentum space [1]. Identifying new nodalline fermions is challenging since often the Dirac nodallines are dispersive, submerged within a Fermi sea, and gapped by spinorbitcoupling. I will first introduce how precise powerlaw behavior of the optical response function can reveal the hidden nodalline fermions, using NbAs_{2} as an example [2]. The large anisotropy associated with nodalline structure gives rise to greatly reduced kinetic energy along the line. I will discuss the two fundamental spectroscopic hallmarks of electronic correlations observed in ZrSiSe [3]: strong reduction (1/3) of the free carrier Drude weight and of the Fermi velocity renormalization compared to predictions of density functional theory. Furthermore, in the ZrSiS/Se the nodallines form closed squares and I will reveal more exotic quasiparticles hidden in the nodalsquares of ZrSiS/Se through magnetooptical spectroscopy. Finally, another consequence of the nodalline structure is the large difference in the plasma frequencies for inplane and outofplane responses, leading to a broadband hyperbolic regime covering infrared and visible frequencies. I will show our recent observation of propagating hyperbolic waves in ZrSiSe, enabled by the van Hove singularities in the nodalsquares [4]. 
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