Abstract
In the previous chapter we have already highlighted the importance of emergent particles as the effective degrees of freedom that determine the properties of strongly-correlated quantum matter at low energies. In this chapter we will present a particular realization of this theme for one-dimensional quantum spin systems; the central idea will be to determine the elementary excitations variationally and treat them as particles in a many-particle description.
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Notes
- 1.
The ansatz was named after Feynman – for obvious reasons – and Bijl, who supposedly wrote down a similar wavefunction in Ref. [9].
- 2.
- 3.
Importantly, every isolated branch is interpreted as a new “elementary particle”, so, in the absence of some particle number, there is no way to differentiate a bound state that is supposedly composed of two elementary particles in the system (see Ref. [43] for the analogous result in QFT).
- 4.
In this chapter we will only consider nearest-neighbour Hamiltonians, but everything can be straightforwardly extended to larger, yet local interactions – the case of long-range interactions is not included.
- 5.
In this chapter all computations will involve this transfer matrix or variations of it. Let us therefore introduce the notations
$$\begin{aligned} E = E^{A}_{A} = \sum _{s=1}^d A^s \otimes \bar{A}^s, \end{aligned}$$for the transfer matrix,
$$\begin{aligned} O_A^A = \sum _{s,t} A^s \otimes \bar{A}^t {\langle {s}|} O {|{t}\rangle }. \end{aligned}$$for the transfer matrix with a one-site operator, and
$$\begin{aligned} O_{AA}^{AA} = \sum _{s,t,s',t'} A^s A^{s'} \otimes \bar{A}^t \bar{A}^{t'} {\langle {ss'}|} O {|{tt'}\rangle }. \end{aligned}$$for a two-site operator. We will also need “transfer matrices” with different tensors; notations:
$$\begin{aligned}&E^{A}_{B} = \sum _{s=1}^d A^s \otimes \bar{B}^s \\&O^{A}_{B} = \sum _{s,t} A^s \otimes \bar{B}^t {\langle {s}|} O {|{t}\rangle } \\&O^{AB}_{CD} = \sum _{s,t,s',t'} A^s B^{s'} \otimes \bar{C}^t \bar{D}^{t'} {\langle {ss'}|} O {|{tt'}\rangle }. \end{aligned}$$ - 6.
It is assumed that the largest eigenvalue is unique, which is only true for so-called injective MPS. In the following, we will always assume this is the case – for all practical applications this assumption is true – and we refer to e.g. Ref. [85] for more details.
- 7.
One can associate a completely positive map to the transfer matrix, for which the left and right fixed points are guaranteed to be positive definite matrices when reshaped to \(D\times D\) matrices l and r.
- 8.
Additional details can be found in Ref. [40].
- 9.
Because we work in the thermodynamic limit, the momentum can take on every value between 0 and \(2\pi \).
- 10.
Note that this does not mean that, by systematically growing the bond dimension, the ansatz can reproduce the effect of ever larger operators. Every B-tensor can be written in terms of operators of size larger than \(2\log D\), but not vice versa. There is no a priori no reason to expect that variational excitation energies will converge to the exact value for large enough D.
- 11.
At momentum zero, the gauge transformations of the B tensor are related to linearized infinitesimal gauge transformations of the A tensors. We refer to the tangent space interpretation of the excitation ansatz in Sect. 3.5 for more details.
- 12.
This “gauging away” of the momentum dependence of the norm seems in contradiction with our remarks that it is the norm that determines the dispersion in the single-mode approximation. But note that the gauge transformation that brings the tensor B in the right gauge is momentum dependent. It is due to the special structure of an MPS that this particular gauge choice is possible: the momentum information in the norm is gauged away through the virtual dimension of the MPS, such that only the numerator contains all momentum dispersion.
- 13.
Again, the norm of the excitations in terms of the vector \(\varvec{x}\) is just the Euclidean inner product, \({\langle {\Phi _\kappa [B_{L/R}(Y)]|\Phi _\kappa [B_{L/R}(X)]}\rangle }=\varvec{y}^\dagger \varvec{x}\), so that the normalization of the states does not show up in the eigenvalue problem.
- 14.
Since we have subtracted the ground-state energy density, the expectation value is zero; this implies that we can safely put in the regularized transfer matrix \(\tilde{E}\) instead of the full one wherever needed to define the pseudo-inverse.
- 15.
- 16.
In finite systems with periodic boundary conditions, topological excitations always have to be described in pairs. In order to capture them in finite systems, non-trivial boundary conditions have to be applied, see e.g. [52].
- 17.
In quantum field theory, this ansatz has been proposed earlier [53] to study the kink excitations in the sine-Gordon model.
- 18.
The form of the two-particle wave function that we propose, is inspired by the similar construction that the Bethe ansatz uses to solve the two-magnon problem for e.g. the Heisenberg model – see Sect. 2.5. In addition, our approach is greatly inspired by Feynman’s lectures on statistical mechanics [54] and Kohn’s variational approach to solve the scattering problem [55].
- 19.
In Ref. [37] this was shown with full mathematical rigour, with a number of caveats that do not need to worry us here.
- 20.
These connections with other computational methods is worked out in more detail in Ref. [40].
- 21.
We have omitted the vectors \(\varvec{v}_1\) and \(\varvec{v}_2\), because they should become equal when the two momenta approach.
- 22.
In the outlook we will discuss how our particle picture can be applied to non-equilibrium physics such as quantum quenches and transport processes.
- 23.
Our approach is assumed to be valid at low densities, and should be connected to the low-density approximation in terms of virial coefficients. In particular, the fact that the second virial coefficient can be written as a function of the two-particle phase shift only [86, 87] and the idea of computing the thermodynamics of a gas directly with the S matrix, seem both to be closely related [88]. On the other hand, as the solution of the Yang–Yang equation is supposed to be the analytic continuation of the full virial expansion [73], our method seems to correspond to an approximate continuation, that is valid beyond first order.
- 24.
See also Ref. [107] for a similar expansion for non-integrable systems.
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Vanderstraeten, L. (2017). Effective Particles in Quantum Spin Chains: The Framework. In: Tensor Network States and Effective Particles for Low-Dimensional Quantum Spin Systems. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-64191-1_3
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