Photograph of the carpeted aisle leading to the judge's bench, between two rows of benches, in the courtroom in the Grimes County courthouse in Anderson, Texas. People stand in the background.

Photograph of wooden benches and railings in a courtroom in the Grimes County courthouse in Anderson, Texas.

Photograph of a clock with a carved wooden frame, mounted on the wall between a Texas flag and an American flag, in the Grimes County courthouse in Anderson, Texas.

Photograph of wooden benches in a darkened courtroom in Grimes County courthouse in Anderson, Texas.

Photograph of furniture, including chairs, a podium, and tables, in a courtroom in the Grimes County courthouse in Anderson, Texas.

Photograph of a hallway, with a wooden bench against one wall, in the Grimes County courthouse in Anderson, Texas.

Photograph of a judge's bench at the front of a courtroom in the Grimes County courthouse in Anderson, Texas. A clock is mounted on the wall between two flags.

Photograph of twelve chairs bolted to the ground behind a railing in a courtroom in the Grimes County courthouse in Anderson, Texas.

Photograph of a lamp mounted on a wall next to two windows in the Grimes County courthouse in Anderson, Texas.

Photograph of a two-branched lamp mounted on a wall in the Grimes County courthouse in Anderson, Texas. A window is partially visible to the right.

Photograph of a lamp hanging from the ceiling in the Grimes County courthouse in Anderson, Texas. Windows are visible in the background.

Photograph of two lamps hanging from the ceiling in the Grimes County courthouse in Anderson, Texas.

Photograph of a closed white door seen through an open door frame in the Grimes County courthouse in Anderson, Texas.

Photograph of the ceiling inside the Grimes County courthouse in Anderson, Texas. A sprinkler and a vent are also visible.

Photograph of twelve wooden chairs with red leather seats behind a railing in a courtroom in the Grimes County courthouse in Anderson, Texas.

Photograph of a lamp hanging from the ceiling inside the Grimes County courthouse in Anderson, Texas. Windows are visible on the walls in the background.

Photograph of several wooden benches and two chairs in a room in the Grimes County courthouse in Anderson, Texas.

Photograph of wooden benches and two chairs in a courtroom in the Grimes County courthouse in Anderson, Texas.

Photograph of a wooden table and two chairs in a darkened courtroom in the Grimes County courthouse in Anderson, Texas.

Photograph of three wooden benches, two windows, and a lamp hanging from the ceiling in a darkened courtroom in the Grimes County courthouse in Anderson, Texas.

Photograph of two men standing to the right inside a courtroom in the Grimes County courthouse in Anderson, Texas. There are wooden chairs, tables, and a railing placed around the room.

Photograph of a UPS truck parked outside the Grimes County courthouse in Anderson, Texas.

Spin-orbit coupled systems generally break the spin rotation symmetry. However, for a model with equal Rashba and Dresselhauss coupling constant (the ReD model), and for the [110] Dresselhauss model, a new type of SU(2) spin rotation symmetry is discovered. This symmetry is robust against spin-independent disorder and interactions, and is generated by operators whose wavevector depends on the coupling strength. It renders the spin lifetime infinite at this wavevector, giving rise to a Persistent Spin Helix (PSH). We obtain the spin fluctuation dynamics at, and away, from the symmetry point, and suggest experiments to observe the PSH.

The effects of various chemical substitutions and induced lattice disorder in the Ce- and Pu-based 115 superconductors are reviewed, with particular emphasis on results from x-ray absorption fine structure (XAFS) measurements. The PuCoGa{sub 5} system offers the opportunity to follow changes in magnetic and electronic properties due to lattice disorder as a function of time in the same samples, in addition to the more traditional approach of perturbing the superconducting state through chemical substitutions. The reviewed work establishes a baseline for such future studies by determining the intrinsic lattice order in the 115 system, successfully understanding disorder as introduced through chemical substitutions in the Ce-based 115s, and beginning to explore the surprisingly large role of self-irradiation damage directly on the PuCoGa{sub 5} lattice. These studies lay the foundation for the harder future work toward measuring chemical substitutions in PuCoGa{sub 5}, correlating effects with non-Fermi liquid behavior, and obtaining a better structural picture of the distortions induced by {alpha}-decay of the plutonium nucleus.