By Emil Prodan

ISBN-10: 3319293508

ISBN-13: 9783319293509

ISBN-10: 3319293516

ISBN-13: 9783319293516

This monograph bargains an summary of rigorous effects on fermionic topological insulators from the advanced periods, specifically, these with out symmetries or with only a chiral symmetry. specific concentration is at the balance of the topological invariants within the presence of robust illness, at the interaction among the majority and boundary invariants and on their dependence on magnetic fields.

The first half offers motivating examples and the conjectures recommend by way of the physics neighborhood, including a quick evaluate of the experimental achievements. the second one half develops an operator algebraic technique for the learn of disordered topological insulators. This leads evidently to using analytical instruments from K-theory and non-commutative geometry, reminiscent of cyclic cohomology, quantized calculus with Fredholm modules and index pairings. New effects comprise a generalized Streda formulation and an explanation of the delocalized nature of floor states in topological insulators with non-trivial invariants. The concluding bankruptcy connects the invariants to measurable amounts and therefore offers a cultured actual characterization of the complicated topological insulators.

This e-book is meant for complicated scholars in mathematical physics and researchers alike.

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**Extra info for Bulk and Boundary Invariants for Complex Topological Insulators: From K-Theory to Physics**

**Example text**

In the bulk, this number is given by the top even Chern number, which is a measurable physical coefficient (see Chap. 7) and takes the form [13] d d Chd (PF ) = (2π i) 2 ( d2 )! 3) 24 2 Topological Solid State Systems: Conjectures, Experiments and Models for the √ periodic crystals. Throughout, Sd will denote the group of permutations and i = −1. 3), PF (k) = χ (Hk ≤ μ) is the spectral projection onto the energy bands below the Fermi level μ. The standard terminology for it is the Fermi projection.

S. 14) is called the trace per volume of the covariant observable F. It is hence, with probability one, independent of the disorder configuration and is equal to the disorder average of the trace of its matrix elements computed at the origin (or any other point of the lattice). In the following we will use the notation T(F) for the trace per volume of a family covariant observables. 12) using a real-space representation and the trace per volume [169] d d Chd (PF ) = (2π i) 2 d ! 2 (−1)ρ T Pω ρ∈Sd i[Pω , Xρi ] .

18) Chd (PF ) = χ 28 2 Topological Solid State Systems: Conjectures, Experiments and Models where the sum on the left goes over all Weyl points. In other words, under deformations of the model, the Weyl singularities will move and possibly collide and annihilate, yet the sum of their chiralities remains the same and equal to the bulk invariant. Above, χ is a sign factor which depends on the normalization (or the sign convention) of the bulk invariant and on the specific representation σ of the odd d −1 dimensional Clifford algebra (recall that there are two inequivalent representations).

### Bulk and Boundary Invariants for Complex Topological Insulators: From K-Theory to Physics by Emil Prodan

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