Abstract
The main goal of this chapter is to introduce the basic concepts of Majorana fermions and zero energy Majorana bound states, and their origin from topology, magnetism and superconductivity. This chapter gears towards young researchers at their early developing stage in their career, and for the most parts, the central ideas are presented in a self-contained manner without assuming professional background knowledge other than fundamental quantum mechanics and solid state physics.
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Notes
- 1.
The quantum phase difference \(e^{i\phi }\) between the two can be absorbed by a gauge redefinition \(\psi _0\rightarrow e^{i\phi /2}\psi _0\).
- 2.
If there are multiple zero modes, there exists an orthogonal transformation that rotates to a new basis where all zero modes are self-conjugate (12.9). For instance, given a zero mode \(\psi _0\) which is not self-conjugate, one can define the self-conjugate zero modes \(\psi _0+\Xi \psi _0^\dagger \), \(i\psi _0-i\Xi \psi _0^\dagger \). This process can be repeated until all zero modes are self-conjugate.
- 3.
Even if there are accidental mid-gap BdG-states, they are not particle-hole symmetric and their wavefunctions carry unequal weights between electron and hole. Consequently, the electric conductance \(\sigma =(2e^2/h)|S_{eh}|^2\) will be smaller than the quantized value \(2e^2/h\).
- 4.
The orthornormal frame corresponds to a N-dimensional subspace \(\mathcal {V}_\mathbf{k}=\mathrm {span}\{\mathbf{u}_m(\mathbf{k})\}_{m=1,\ldots ,N}\) for each \(\mathbf{k}\). The collection of these subspaces is known as a vector bundle \(\mathcal {V}=\coprod _{\mathbf{k}\in BZ}\mathcal {V}_\mathbf{k}\). The vector bundle is trivial if it decomposes into a cartesian product \(\mathcal {V}\cong BZ\times \mathbb {C}^N\), which is the case if and only if there is a global continuous eigen-frame \(\mathbf{u}_m(\mathbf{k})\). Otherwise, the vector bundle is topological. For the mathematics of vector bundles and their classification, we refer the readers to [70,71,72].
- 5.
Contrary to the SOC wire model, by computing the Chern-Simons invariant (12.33) here, the weak field phase (i.e. the superconducting edge) is topological while the strong field phase (i.e. the magnetic edge) is trivial.
- 6.
In reality the pairing strength plateaus \(\Delta (\mathbf{r})=|\Delta _{\infty }|e^{i\varphi (\mathbf{r})}\) for \(|\mathbf{r}|\gg 0\) far away from the vortex. However, because of the non-trivial winding of the phase, \(\Delta (\mathbf{r})\) cannot be compactified or otherwise it would be discontinuous at \(\infty \). We deform the model and let the pairing strength plateaus up to some long length scale L until it eventually diverges at \(\infty \). In this case after compactifying both real and pairing spaces \(\mathbb {S}^2=\mathbb {R}^2\cup \{\infty \}\), the pairing function \(\Delta :\mathbb {S}^2\rightarrow \mathbb {S}^2\) is continuous.
- 7.
The Nambu doubled BdG theory of the bottom surface can be regularized at large momentum by adding \(\varepsilon k^2\sigma _z\tau _z\), for instance, \(\varepsilon \) could be \(\hbar ^2/2m\). Depending on the relative sign of \(\varepsilon \) and B, the Chern numbers of the \((+,-)\) sectors are now \((\pm 1,0)\) or \((0,\pm 1)\) as \(\hat{\mathbf{h}}_\pm \) cover either the entire Bloch sphere or nothing at all.
- 8.
The chiral Dirac interface fermion between time reversal conjugate magnetic TI surface domains can be illustrated by solving the Bloch Hamiltonian \(H_{\mathrm {surface}}(\mathbf{k}_\Vert )=\lambda (k_x\sigma _x+k_y\sigma _y)+g\mu _BB(x)\sigma _z\) for \(k_x\leftrightarrow -i\partial _x\) and B(x) changes sign across the domain wall along the y-axis. The derivation is similar to that of the Jackiw-Rebbi model (12.76) and is carried out in the context of a BdG model later in (12.103).
- 9.
Here we do not make the distinction between Dirac and Weyl (semi)metals because they both consist of pairs of Weyl fermions with opposite chiralities. We do not pay attention to their spatial symmetry origins and their locations in momentum space.
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Acknowledgements
I am in debt to Prof. Charlie Kane, who was my Ph.D advisor and introduced the concepts of Majorana and topological insulators and superconductors to me during my graduate years. In addition, I also thank all my research collaborators, in particular Ching-Kai Chiu, Eduardo Fradkin, Liang Fu, Taylor Hughes, and Shinsei Ryu, who not only made significant contributions to the advancement in Majorana physics but also had valuable impact on my academic development. Last but not least, I am grateful to all my students, especially Syed Raza, who went through the manuscript and provided helpful feedback. This chapter is supported by the National Science Foundation under Grant No. DMR 1653535.
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Teo, J.C.Y. (2018). Majorana States. In: Zang, J., Cros, V., Hoffmann, A. (eds) Topology in Magnetism. Springer Series in Solid-State Sciences, vol 192. Springer, Cham. https://doi.org/10.1007/978-3-319-97334-0_12
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