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Transition from Anisotropic A Phase to Nearly Isotropic B Phase in Quantum System

Discover the step-by-step evolution from the A phase with gap nodes to the B phase with almost isotropic gaps. Following the separation of spin nodes and L-vectors, the topological charge of the nodes reaches zero, leading to a full transformation to the B phase. Find out more about the quasiparticle motion and intricate structural changes across the interface.

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Transition from Anisotropic A Phase to Nearly Isotropic B Phase in Quantum System

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Presentation Transcript

  1. How do we get smoothly from the anisotropic A phase with gap nodes to . . .

  2. . . . . the B phase with an isotropic (or nearly isotropic) gap?

  3. We start in the A phase with nodes in the gap and the L-vector for both up and down spins pairs parallel to the nodal line.

  4. We start in the A phase with nodes in the gap and the L-vector for both up and down spins pairs parallel to the nodal line.

  5. The up spin and down spin nodes (and L-vector directions) separate

  6. The up spin and down spin nodes (and L-vector directions) separate

  7. . . . . . and separate further.

  8. The up spin and down spin nodes finally become antiparallel (making the topological charge of the nodes zero) and can then continuously fill to complete the transformation to the B phase.

  9. The up spin and down spin nodes finally become antiparallel (making the topological charge of the nodes zero) and can then continuously fill to complete the transformation to the B phase.

  10. B phase A phase The quasiparticle motion. We thus obtain the above complex structure across the interface.

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