Abstract
The nonlinear Hall effect is an unconventional response, in which a voltage can be driven by two perpendicular currents in the Hall-bar measurement. Unprecedented in the family of the Hall effects, it can survive time-reversal symmetry but is sensitive to the breaking of discrete and crystal symmetries. It is a quantum transport phenomenon that has deep connection with the Berry curvature. However, a full quantum description is still absent. Here we construct a quantum theory of the nonlinear Hall effect by using the diagrammatic technique. Quite different from nonlinear optics, nearly all the diagrams account for the disorder effects, which play decisive role in the electronic transport. After including the disorder contributions in terms of the Feynman diagrams, the total nonlinear Hall conductivity is enhanced but its sign remains unchanged for the 2D tilted Dirac model, compared to the one with only the Berry curvature contribution. We discuss the symmetry of the nonlinear conductivity tensor and predict a pure disorder-induced nonlinear Hall effect for point groups C3, C3h, C3v, D3h, D3 in 2D, and T, Td, C3h, D3h in 3D. This work will be helpful for explorations of the topological physics beyond the linear regime.
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Introduction
The recently discovered nonlinear Hall effect1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22 is a new member of the Hall family23,24,25,26. It is characterized by a nonlinear transverse voltage (or current) in response to two ac currents (or electric fields). The nonlinear Hall effect does not require breaking time-reversal symmetry but inversion symmetry. More importantly, this effect is an unconventional response sensitive to the breaking of discrete and crystal symmetries and thus can be used to probe phase transitions induced by spontaneous symmetry breaking, such as ferroelectric27 or a space symmetry-related hidden order transition28,29. It has recently been proposed that the nonlinear Hall effect can also be used to probe the quantum critical point3,6,17 and Néel vector orientation in antiferromagnets18. Various related phenomena have also been proposed, such as the gyrotropic Hall effect30, the Magnus Hall effect31, and the nonlinear Nernst effect32,33.
The nonlinear Hall effect has a quantum nature because of its connection with the Berry curvature dipole. The Berry curvature can be regarded as a magnetic field in parameter space (e.g., momentum space). It describes the bending of parameter spaces, arising from the geometric structure of quantum eigenstates. The Berry curvature dipole describes the dipole moment of the Berry curvature in momentum space1. In addition, the nonlinear Hall effect is a quantum transport phenomenon near the dc limit because of the extremely low frequency (~10 to 1000 Hz) of the input currents in experiments7,8,34,35,36,37,38,39,40,41. The importance of the quantum description of dc quantum transports has been well acknowledged42. Despite its quantum nature, by far there are only semiclassical theories based on the Boltzmann equations under the relaxation time approximation1,6,9,10,11,30,43. There has been a tendency towards a quantum description of the nonlinear Hall effect10,11. A new side-jump contribution without semiclassical correspondence has also been discovered10. However, a systematic quantum theory of the nonlinear Hall effect that can explicitly describe the disorder effects is yet to be developed.
In this work, we construct a quantum theory for the nonlinear Hall effect using the diagrammatic technique. Unlike the bubble diagrams of the linear-response theory, the quadratic responses are described by triangular and two-photon diagrams, representing two inputs and one output. We identify 69 Feynman diagrams that contribute to the leading nonlinear responses in the weak-disorder limit, including the intrinsic, side-jump, and skew-scattering contributions (Fig. 1). Quite different from nonlinear optics44,45,46,47,48, 64 out of these diagrams account for the disorder effects, which are decisive for electronic transport. We formulate the diagrams for a generic two-band model and apply them to calculate the nonlinear Hall conductivity of a disordered 2D tilted Dirac model. The general formulas obtained from the diagrammatic calculations can be directly adopted by the first-principles calculations. According to the symmetry of the diagrams, we perform a symmetry analysis of the nonlinear Hall response tensor for all of the 32 point groups (see Table 1 for 2D and Supplementary Table 2 for 3D).
Results
Nonlinear response and Feynman diagrammatics
In response to ac electric fields along with the b and c directions, the nonlinear electric current along the a direction can be formally written as (Supplementary Note 2)
where {a, b, c} ∈ {x, y, z}, \({{{{{{{{\mathcal{E}}}}}}}}}_{b,c}\) and ωb,c are the amplitudes and frequencies of the electric fields, respectively. For a mono-frequency electric field input, ξabc and χabc are the zero- and double-frequency responses, respectively, and we should have ξabc = χabc by definition when ωb = ωc = 0. In experiments, it is more convenient to measure the double-frequency response, which is less sensitive to low-frequency noises, so we focus on χabc.
It has been pointed out that48,49, in order to compute a gauge invariant nonlinear conductivity up to quadratic order in electric fields, one should expand the vector potential A in the Peierls substituted Hamiltonian \(\hat{{{{{{{{\mathcal{H}}}}}}}}}({{{{{{{\boldsymbol{k}}}}}}}}+e{{{{{{{\boldsymbol{A}}}}}}}}/\hslash )\) up to the third order, where −e is the electron charge. These high-order terms are proportional to the tensor generalization (\({\hat{v}}_{ab}={\partial }_{{{{{{{{\boldsymbol{k}}}}}}}}}^{b}{\partial }_{{{{{{{{\boldsymbol{k}}}}}}}}}^{a}\hat{{{{{{{{\mathcal{H}}}}}}}}}/{\hslash }^{2}\) and \({\hat{v}}_{abc}={\partial }_{{{{{{{{\boldsymbol{k}}}}}}}}}^{c}{\partial }_{{{{{{{{\boldsymbol{k}}}}}}}}}^{b}{\partial }_{{{{{{{{\boldsymbol{k}}}}}}}}}^{a}\hat{{{{{{{{\mathcal{H}}}}}}}}}/{\hslash }^{3}\)) of the velocity operator \({\hat{v}}_{a}={\partial }_{{{{{{{{\boldsymbol{k}}}}}}}}}^{a}\hat{{{{{{{{\mathcal{H}}}}}}}}}/\hslash\), where \({\partial }_{{{{{{{{\boldsymbol{k}}}}}}}}}^{a}\equiv \partial /\partial {k}_{a}\), \({\hat{v}}_{ab}\) and \({\hat{v}}_{abc}\) correspond to the two- and three-photon processes, respectively. To achieve a divergent free description in the dc limit, one needs to treat all the coupling vertices on the same footing. After a lengthy calculation (Supplementary Note 2), one can obtain the quadratic conductivity in the dc limit as50 \({\chi }_{abc}={\chi }_{abc}^{I}+{\chi }_{abc}^{II}+{\chi }_{abc}^{III}\), where
[dk] ≡ dnk/(2π)n with n for the dimensionality, \({{{{{{{\rm{Im}}}}}}}}(\hat{{{{{{{{\mathcal{O}}}}}}}}})\equiv (\hat{{{{{{{{\mathcal{O}}}}}}}}}-{\hat{{{{{{{{\mathcal{O}}}}}}}}}}^{{{{\dagger}}} })/2i\) for an operator \(\hat{{{{{{{{\mathcal{O}}}}}}}}}\), \({\hat{G}}^{R/A}(\varepsilon )\) is the retarded/advanced Green’s function, and \(f(\varepsilon )=1/\{1+\exp [(\varepsilon -{\varepsilon }_{{{{{{{{\rm{F}}}}}}}}})/{k}_{B}T]\}\) is the Fermi distribution with the Fermi energy εF. \({\chi }_{abc}^{I}\) and \({\chi }_{abc}^{II}\) are the Fermi surface contributions, where \({\chi }_{abc}^{I}\) describes the triangular diagrams while \({\chi }_{abc}^{II}\) describes the two-photon diagrams. The diagrammatic representation of \({\chi }_{abc}^{I}\) and \({\chi }_{abc}^{II}\) are not standard but effective one obtained from analytical calculations (Supplementary Note 2). \({\chi }_{abc}^{III}\) is the Fermi sea contribution, in which all the terms depend on the products of \({\hat{G}}^{R}\) only or \({\hat{G}}^{A}\) only. It can be shown that terms in \({\chi }_{abc}^{III}\) are one order smaller than the leading terms in \({\chi }_{abc}^{I}\) and \({\chi }_{abc}^{II}\) in the weak-disorder limit51, we can hence neglect the Fermi sea contributions in the low-frequency transports. By transforming into the eigenstate basis, we can describe different mechanisms of the nonlinear Hall conductivity explicitly within the diagrammatic approach. In the weak-disorder limit, only the contributions in the leading order of the impurity concentration ni are important, and thus the diagrams are selected according to their ni dependence (see Methods). The relevant diagrams for time-reversal symmetric systems are shown in Fig. 1, which can be further classified into intrinsic, side-jump, and skew-scattering diagrams according to their correspondences in the semiclassical descriptions.
Generic model and disorder
We consider a generic two-band model as a building block for realistic systems
where σx,y,z are the Pauli matrices, h0 and hx,y,z are functions of the wave vector k = (kx, ky, kz). The model describes two energy bands (denoted as ±) with the band dispersions \({\varepsilon }_{{{{{{{{\boldsymbol{k}}}}}}}}}^{\pm }={h}_{0}\pm {h}_{{{{{{{{\boldsymbol{k}}}}}}}}}\), where \({h}_{{{{{{{{\boldsymbol{k}}}}}}}}}\equiv {({h}_{x}^{2}+{h}_{y}^{2}+{h}_{z}^{2})}^{1/2}\). The disorder is modeled as δ-function scatters Vimp(r) = ∑iViδ(r − Ri) with a random distribution Ri and the disorder strength Vi satisfying 〈Vi〉 = 0, \(\langle {V}_{i}^{2}\rangle ={V}_{0}^{2}\), and \(\langle {V}_{i}^{3}\rangle ={V}_{1}^{3}\), where 〈. . . 〉 means the ensemble average over disorder configurations. Up to the leading order, the disorder scattering has two types of correlation: one correlates two scattering events (Gaussian disorder distribution), and the other correlates three scattering events (non-Gaussian disorder distribution).
The above considerations allow us to identify the physical mechanism of each diagram (see Methods) and derive the expressions of the nonlinear Hall conductivity for the generic two-band model (Supplementary Note 3 and 4). The intrinsic part up to the leading order is only contributed by Fig. 1a and is still proportional to the Berry curvature dipole, its expression within the quantum theory is
where \(f^{\prime} (\varepsilon )\equiv \partial f(\varepsilon )/\partial \varepsilon\), εacd is the Levi-Civita antisymmetric tensor, \({\tau }_{{{{{{{{\boldsymbol{k}}}}}}}}}^{+}\) is the scattering time, \({{{\Omega }}}_{a{{{{{{{\boldsymbol{k}}}}}}}}}^{+}\) is the Berry curvature, and \({\tilde{v}}_{a{{{{{{{\boldsymbol{k}}}}}}}}}^{++}\) is the vertex-corrected diagonal velocity. As we do not assume a detailed vertex-correction form of \({\tilde{v}}_{a{{{{{{{\boldsymbol{k}}}}}}}}}^{++}\) that corresponds to the gray shadow in Fig. 1a, many possible quantum corrections can in principle be accounted in forms of \({\tilde{v}}_{a{{{{{{{\boldsymbol{k}}}}}}}}}^{++}\). More strikingly, the side-jump and skew-scattering parts include qualitatively new contributions that go beyond the semiclassical description (Supplementary Note 3 and 4). Especially, the contribution from the two-photon diagrams is related to the leading ω-dependent part of the vertex correction, which is a peculiar feature of nonlinear transports. As the semiclassical description of the nonlinear Hall effect is obtained by generalizing the modern semiclassical theory of the anomalous Hall effect52 to the nonlinear response regime, this qualitative inconsistency indicates that a proper semiclassical theory of the nonlinear Hall effect warrants some special considerations.
Nevertheless, we find that the quantum theory does not modify the scaling law because the scaling behavior is determined by the order of the disorder-dependence of each mechanism9,38, while so far we find that the disorder dependence is the same for the semiclassical and quantum theories.
Simplified representation of the Feynman diagrams
For a better understanding of the side-jump and skew-scattering diagrams, it is desirable to introduce some quantities that can simplify the diagrammatic representation. The 16 disorder-related diagrams of the anomalous Hall effect can be simplified into 3 by introducing the side-jump and skew-scattering velocities \({v}_{a}^{sj}\) and \({v}_{a}^{sk}\). As the two-photon diagrams of the nonlinear Hall effect share the same Green’s function parts as those of the anomalous Hall effect, these diagrams can also be simplified by introducing \({v}_{a}^{sj}\) and \({v}_{a}^{sk}\) but with an additional tensor generalization of the side-jump velocity \({v}_{ab}^{sj}\) as shown in Fig. 2e, f. To simplify the triangular diagrams, we have introduced the modified off-diagonal, side-jump, and skew-scattering velocities \({\tilde{v}}_{a}^{+-}\), \({\tilde{v}}_{a}^{sj}\), and \({\tilde{v}}_{a}^{sk}\), respectively. By introducing these quantities we can simplify the 46 disorder-induced triangular diagrams into 16 as shown in Fig. 2b, c (Supplementary Note 6).
Other than reducing the number of diagrams, the simplified representation of the diagrams highlights the qualitative difference between the nonlinear Hall diagrams and the anomalous Hall ones. Although \({\tilde{v}}_{a}^{sj}\) and \({\tilde{v}}_{a}^{sk}\) can be considered as the generalization of \({v}_{a}^{sj}\) and \({v}_{a}^{sk}\), the disorder modification complicates the quantum results so much that they are very different from their semiclassical counterparts. In addition, the \({\tilde{v}}_{a}^{+-}\) related diagrams obviously do not have any linear counterpart. More interestingly, these simplified diagrams show similar structures as the intrinsic triangular diagrams, although the \({\tilde{v}}_{a}^{+-}\) related skew-scattering diagrams do not contribute to the nonlinear Hall conductivity within our simple considerations. Another important difference comes from the diagrams with the indecomposable self-energy \({{{\Sigma }}}_{{{{{{{{\boldsymbol{k}}}}}}}}{{{{{{{\boldsymbol{k}}}}}}}}^{\prime} {{{{{{{\boldsymbol{k}}}}}}}}^{\prime\prime} }\). Although it also vanishes in our consideration, this type of diagrams can be important once we go beyond the non-crossing approximation. This simplified representation of the nonlinear Hall diagrams is general and is not restricted by models or approximations.
Application to the 2D tilted Dirac model
For an intuitive estimate of the quantum contributions, we apply the diagrams to calculate the nonlinear response for the 2D tilted Dirac model, whose Hamiltonian can be obtained by letting
in Eq. 5 with the model parameters t, v, and m. This is the minimal model of the nonlinear Hall effect because it has strong Berry curvature and has no inversion symmetry1,6,7. t/v measures the tilt of the Dirac cone along the x direction, which breaks inversion symmetry. 2m is the band gap6. A single 2D Dirac cone does not have time-reversal symmetry. Time-reversal symmetry is satisfied by including its time-reversal partner (m → − m, t → − t) at opposite regions of the Brillouin zone7, which contributes the same nonlinear Hall response by symmetry.
With the help of effective diagrammatics, the nonlinear Hall conductivity χyxx of the 2D Dirac model at zero temperature can be obtained (Supplementary Note 8), as shown in Fig. 3. Within the non-crossing approximation, the intrinsic contribution from the quantum theory is identical to the result from the semiclassical theory1 (Fig. 3a). However, the side-jump and skew-scattering contributions calculated by the quantum theory demonstrate opposite signs, compared to the semiclassical results (Fig. 3b, c). As a result, the nonlinear Hall conductivity also has opposite signs for the semiclassical and quantum theories (Fig. 3d). Different from the semiclassical results, the total quantum result shares the same sign and similar line shape with the intrinsic contribution but with a greater magnitude. The sign change from the semiclassical theory to the quantum theory is partially supported by another work beyond the semiclassical theory, where a tendency of the sign change is observed as the quantum description comes in11. Our calculation results then provide an explanation on the fact that although the scaling experimental results indicate comparable intrinsic and disorder-induced contributions8, the qualitative feature of the nonlinear Hall effect can still be well described by the Berry curvature dipole in bilayer WTe26,7.
Our quantitative results come from a case study, which unnecessarily includes certain approximations on the methods and models. As the competition between the intrinsic and extrinsic mechanisms may be different from case to case, future studies are needed to reveal the possible general rules. Nevertheless, our calculation clearly shows that the quantum description is very important for the nonlinear Hall effect, especially when the disorder effects are relevant.
Symmetry aspects of the nonlinear response
According to our diagrammatic results, the disorder-induced extrinsic contribution to the quadratic nonlinear conductivity is a rank-three tensor with the constraint \({\chi }_{abc}^{ex}={\chi }_{acb}^{ex}\), while the intrinsic contribution related to the Berry curvature dipole has extra antisymmetric properties under the label exchanges a ↔ b or a ↔ c, as described by
where Tab and Tabc are rank-two and rank-three tensors, respectively. The extrinsic response tensor χex has more nonzero elements than χin. More importantly, the different symmetry properties under the exchange of labels impose different constraints on the elements of the nonlinear response tensor.
For a complete investigation, we check both the nonzero elements of χex and χin for all of the 32 point groups (Supplementary Note 9). The results for 2D systems are summarized in Table 1, where the matrix is defined as
and we have highlighted the elements that exist in χex but vanish in χin. The results for 3D systems can be found in Supplementary Table 2. These elements are contributed by the disorder effects and thus represent the Berry curvature irrelevant nonlinear Hall response. In some point groups, such as C3, C3h, C3v, D3h, and D3 in 2D, the Berry curvature-dipole-related χin vanishes, but χex survives. For 3D systems, the point groups that support the pure disorder-induced nonlinear Hall effect are T, Td, C3h, and D3h. Therefore, the nonlinear Hall effect observed in systems with these point groups can only be induced by disorder.
Methods
Diagram construction
In the weak-disorder limit, the diagrams of leading contributions are constructed according to their dependence on the impurity concentration ni51. For systems with time-reversal symmetry, the leading contribution to the nonlinear transport is of order \({n}_{i}^{-1}\), which can be obtained by adding non-ladder-type scattering events to the simplest triangular and two-photon diagrams53. The resulting diagrams of order \({n}_{i}^{-1}\) within the non-crossed approximation are shown in Fig. 1a–h, which include intrinsic, side-jump, intrinsic and extrinsic skew-scattering contributions. A complete summary of all the 69 diagrams for each contribution can be found in Supplementary Figs. 5–9 (triangular) and 11–15 (two-photon).
The classification of these diagrams is carried out via finding the characteristic physical quantities. For the intrinsic contribution (Fig. 1a, e), the characteristic quantity is the Berry curvature. For the side-jump contribution (Fig. 1b, f), the characteristic quantity is \({v}_{a{{{{{{{\boldsymbol{k}}}}}}}}}^{+-}\langle {V}_{{{{{{{{\boldsymbol{k}}}}}}}}{{{{{{{\boldsymbol{k}}}}}}}}^{\prime} }^{-+}{V}_{{{{{{{{\boldsymbol{k}}}}}}}}^{\prime} {{{{{{{\boldsymbol{k}}}}}}}}}^{++}\rangle\) with \({V}_{{{{{{{{\boldsymbol{k}}}}}}}}{{{{{{{\boldsymbol{k}}}}}}}}^{\prime} }^{-+}\equiv \langle {u}_{{{{{{{{\boldsymbol{k}}}}}}}}}^{-}| {V}_{imp}| {u}_{{{{{{{{\boldsymbol{k}}}}}}}}^{\prime} }^{+}\rangle\), which represents an off-diagonal scattering process. The skew-scattering contribution contains two categories as intrinsic (Fig. 1c, g) and extrinsic (Fig. 1d, h) skew-scattering according to their characteristic scattering processes (Supplementary Note 7). The first one is from the leading asymmetric scattering contribution due to the Gaussian disorder within the non-crossing approximation, which is characterized by \(\langle {V}_{{{{{{{{\boldsymbol{k}}}}}}}}{{{{{{{\boldsymbol{k}}}}}}}}^{\prime} }^{-+}{V}_{{{{{{{{\boldsymbol{k}}}}}}}}^{\prime} {{{{{{{\boldsymbol{k}}}}}}}}}^{++}\rangle \langle {V}_{{{{{{{{\boldsymbol{k}}}}}}}}^{\prime\prime} {{{{{{{\boldsymbol{k}}}}}}}}}^{+-}{V}_{{{{{{{{\boldsymbol{k}}}}}}}}{{{{{{{\boldsymbol{k}}}}}}}}^{\prime\prime} }^{++}\rangle\). The second one is from the leading asymmetric scattering contribution due to the non-Gaussian disorder, which is characterized by \(\langle {V}_{{{{{{{{\boldsymbol{k}}}}}}}}{{{{{{{\boldsymbol{k}}}}}}}}^{\prime} }^{++}{V}_{{{{{{{{\boldsymbol{k}}}}}}}}^{\prime} {{{{{{{\boldsymbol{k}}}}}}}}^{\prime\prime} }^{++}{V}_{{{{{{{{\boldsymbol{k}}}}}}}}^{\prime\prime} {{{{{{{\boldsymbol{k}}}}}}}}}^{++}\rangle\).
Remarks on the effective diagrammatics
The effective diagrammatic representations of \({\chi }_{abc}^{I}\) and \({\chi }_{abc}^{II}\) provide us an approach for a quantum description of the nonlinear Hall effect, although its construction is not so straightforward and indicates the importance of the multiphoton processes even for systems with a linear k-dependent Hamiltonian. Because of the establishment of Eqs. 2–4 requires that all the coupling vertices (\({\hat{v}}_{a}\), \({\hat{v}}_{ab}\), \({\hat{v}}_{abc}\)) should be finite, a correct interpretation of the effective diagrammatic theory is that we should first include the multiphoton coupling vertices to obtain the general expression in the dc limit, and then turn to the low-energy effective Hamiltonian for detailed calculations. Alternatively, a direct calculation of the triangular diagrams would lead to unphysical results in the dc limit (Supplementary Note 5). A possible reason for this puzzle is that, the linear k-dependent Hamiltonian is only a low-energy effective description but there are always multiphoton coupling vertices for the Bloch bands. An accurate description of the nonlinear Hall effect may require full-band information even though it is only a Fermi surface effect.
Data availability
The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.
Code availability
The code that is deemed central to the conclusions is available from the corresponding author upon reasonable request.
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Acknowledgements
We thank helpful discussions with Huimei Liu, Suyang Xu, Alex Levchenko, and Antti-Pekka Jauho. This work was supported by the National Natural Science Foundation of China (12004157, 11974249, and 11925402), the National Basic Research Program of China (2015CB921102), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB28000000), the Natural Science Foundation of Shanghai (Grant No. 19ZR1437300), Guangdong province (2020KCXTD001 and 2016ZT06D348), Shenzhen High-level Special Fund (G02206304 and G02206404), and the Science, Technology and Innovation Commission of Shenzhen Municipality (ZDSYS20170303165926217, JCYJ20170412152620376, and KYTDPT20181011104202253). The numerical calculations were supported by the Center for Computational Science and Engineering of Southern University of Science and Technology.
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Z.Z.D. performed the calculations with assistance from C.M.W., H.-P.S., and H.-Z.L.. Z.Z.D. and H.-Z.L. wrote the manuscript with assistance from C.M.W., H.-P.S., and X.C.X. H.-Z.L. and X.C.X. supervised the project.
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Du, Z.Z., Wang, C.M., Sun, HP. et al. Quantum theory of the nonlinear Hall effect. Nat Commun 12, 5038 (2021). https://doi.org/10.1038/s41467-021-25273-4
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DOI: https://doi.org/10.1038/s41467-021-25273-4
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