The fate of a hole injected in an antiferromagnet is an outstanding issue of strongly correlated physics. It provides important insights into doped Mott insulators closely related to high-temperature superconductivity. Here, we report a systematic numerical study of t-J ladder systems based on the density matrix renormalization group. It reveals a surprising result for the single hole's motion in an otherwise well-understood undoped system. Specifically, we find that the common belief of quasiparticle picture is invalidated by the self-localization of the doped hole. In contrast to Anderson localization caused by disorders, the charge localization discovered here is an entirely new phenomenon purely of strong correlation origin. It results from destructive quantum interference of novel signs picked up by the hole and since the same effect is of a generic feature of doped Mott physics, our findings unveil a new paradigm which may go beyond the single hole doped system.
A critical step in understanding the physics of doped Mott insulators which is closely related to high-temperature superconductivity in cuprates1,2,3 is to investigate the motion of a single hole in Mott antiferromagnets2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20. It is easy to imagine that an injected hole in an antiferromagnetically ordered state leaves on its path the trace of spin mismatches in the staggered magnetization direction (to be called “Sz-string” below). Such Sz-string was expected21 to cause the localization of the hole, but, as was later realized8, it can be self-healed via quantum spin flips. It was then conjectured7,8,10,11 that a quasiparticle picture should be still valid in long-distance, as if the Bloch theorem holds true even for such a many-body system. The quasiparticle picture was further supported by finite-size exact diagonalizations12 on lattices up to 32 sites13. However, experimentally, in angle-resolved photoemission spectroscopy (ARPES) studies22,23,24, very broad single-particle spectral features have been observed in parent Mott insulator materials such as Ca2CuO2Cl2 and Sr2CuO2Cl2. They cast a serious doubt14,17 on the rationale of understanding an individual hole created by the photon within a quasiparticle description. Recently, a strongly localized charge state in the copper-oxide layer, induced by an off-the-layer dopant defect, was observed in the scanning tunneling microscope experiment on Ca2CuO2Cl225. In fact, the charge localization is generally found in a lightly doped cuprate before the system becomes a high-Tc superconductor26. These experiments raise a fundamentally important issue, i.e., whether the observed localization is an intrinsic phenomenon.
Theoretically, the validity of a quasiparticle description has been questioned in the literature as well. It was first argued by Anderson9 on general grounds that the quasiparticle spectral weight should vanish due to an unrenomalizable many-body phase shift induced when a hole is injected into a Mott insulator. Later, the discovery of the so-called phase string4,5,27 leads to a microscopic justification of this crucial observation. Here, a phase string may be regarded as an S±-string as opposed to the aforementioned “Sz-string”. It is irreparable by quantum spin flips in contrast to the Sz-string. It was further predicted17 that the phase string, instead of the Sz-string21, is responsible for an intrinsic self-localization of the injected hole in two dimensions.
In this work, a large-size numerical simulation is used as a powerful machinery to resolve this issue. This approach is of particular importance because the hole's motion is highly sensitive to quantum interference developing at long distance. To this end, we study the ladder systems by the DMRG method28, in which the length scale along one direction can be sufficiently large. As a ladder sample is long enough, we find that the charge generally gets localized so long as the leg number is larger than one. The localization scale decreases monotonically as the leg number increases. Contrary to this, if the sample is short, the injected hole behaves itinerantly, implying that the quasiparticle picture found in earlier numerical studies is likely a small-size effect. We demonstrate that the charge self-localization finds its origin in quantum destructive interference of the phase string, a unique property of the t-J model4,5,27. In particular, we show that the novel localization phenomenon disappears once the phase string is turned off artificially in the simulation, where a well-defined quasiparticle description is recovered in consistency with the common wisdom8 of spin polaron picture.
A prototypical doped Mott insulator is described by the t-J Hamiltonian, Ht-J = Ht + HJ, with
Here, is the electron creation operator at site i, Si the spin operator and ni the number operator. The summation is over all the nearest-neighbors, 〈ij〉. The Hilbert space is constrained by the no-double-occupancy condition, i.e., ni ≤ 1. At half-filling, ni = 1, the system reduces to Mott insulators (antiferromagnets) with a superexchange coupling, J. Upon doping a hole into this system, ni = N − 1 (N the number of the lattice sites) and the hopping process is triggered as described by the hopping term, Ht, with t the hopping integral.
For the single hole doped t-J model in a bipartite lattice, there exists an exact theorem, which states4,5,27 that the propagation of the hole is a superposition of quantum amplitudes of all the paths, with each path carrying a unique sign sequence known as the phase string, i.e.,
Here, the sign ± on the right-hand side keeps track of an ↑ or ↓-spin exchanged with the hole at each step of hopping as illustrated in Fig. 1 (A).
The quantum interference of phase strings from different paths is strong and play the fundamental role in dictating the long-distance behavior of the hole. In order to uniquely pin down the effect of phase strings, we also introduce the so-called σ · t-J model with the hopping term Ht in Eq. (1) replaced by
(i.e., an extra sign σ = ±1 is added). It is easy to show, following Refs. 4, 5, 27, that the phase string (2) disappears, whereas the positive weight for each path remains unchanged [as illustrated in Fig. 1 (B)]. In other words, one can artificially switch on and off the phase string effect between the t-J and σ · t-J models to study its novel consequences.
Previously the DMRG algorithm has already been used to study the t-J model in ladder systems at low hole doping16,29. Below we shall focus on the one hole case on bipartite lattices of N = Nx × Ny, where Nx and Ny are the site numbers in the x and y directions, respectively. By using the DMRG method, we shall study the ladders with small Ny (from 1 to 5) and sufficiently large Nx. Here we set J as the unit of energy and focus on the t/J = 3 case unless otherwise specifically stated.
Self-localization of the charge
Typical examples of the hole density distribution, , are shown in Fig. 2 (A) and (B) for Ny = 3 and 4, respectively. Here the charge profiles are plotted along the x direction for a middle leg of the ladders. They are localized in the central region of the ladders with open boundaries. Upon summing up the distribution at all the sites of different legs, the sum rule: is satisfied. Examples of the contour plot of in the x-y plane can be found in Fig. S3 in Supplementary Information.
We systematically change the ladder length Nx to study the full width at half-maximum (FWHM) of the charge profile. Fig. 2 (C) shows that for ladders with different Ny, the FWHM increases linearly for small sample lengths, while saturates for sufficiently large sample lengths (except the Ny = 1 case). The former indicates that the doped hole still remains itinerant at small Nx. The latter suggests that a self-localization takes place for the doped hole, when the ladder length is long enough where the FWHM is no longer sensitive to the boundaries along the x-direction. Later on, by a more precise analysis, it will be shown that such localization only involves the charge of the doped hole, not its spin. Furthermore, Fig. 2 (C) clearly shows that the saturated FWHM at Ny > 1 monotonically decreases with the increase of the leg number Ny, implying that the localization effect becomes stronger and stronger. By contrast, there is no indication of saturation in FWHM for long one-dimensional chains (Ny = 1, with Nx up to 500), which is consistent with the fact that the doped hole in strictly one dimension exhibits the Luttinger liquid behavior2.
The destructive quantum interference effect of phase strings in the t-J model provides a natural explanation for the charge “self-localization” observed in the above DMRG results. To further confirm the phase string origin of self-localization, we switch off the phase string interference by two methods and then repeat the previous procedure of numerical simulations. In the first method, we study the σ · t-J model introduced above. In the second method, we set the interchain hopping coefficient, t⊥, to be zero such that the hole can only move in the x-direction as if in a one-dimensional chain. In both cases, the interference picture shown in Fig. 1 (A) breaks down. The numerical results for these two models are presented in Fig. 2 (D) for two-and three-leg cases, in which the FWHM of the hole density distribution restores the behavior of linear increase with the sample length. It indicates that the charge becomes delocalized in both cases, in sharp contrast to the self-localization in the t-J model.
Although the observed self-localization is insensitive to the parity (even-odd) of the leg number, the hole distribution is, as shown in Fig. 2 (A) and (B) and Supplementary Information: for the even-leg ladders (Ny = 2, 4), there are always small spatial oscillations on top of the Gaussian density profile, while they are absent for the odd-leg ladders (Ny = 3, 5). This can be attributed to distinct decaying behavior of spin-spin correlations for the odd- and even-leg ladders at half-filling: the former (latter) follows a power (an exponential) law reflecting the absence (presence) of spin gap, see Supplementary Information for further explanations. Furthermore, the distinction of the even-odd effect disappears with the increase of t/J ratio (see Fig. S4), indicating that the detailed spin dynamics, governed by J, is not essential to the charge self-localization effect.
Now let us examine the momentum distribution of the hole by studying . At half-filling, one finds n(k) = 1 and for the one hole case, 1 − n(k) is shown in Fig. 3.
The insets of Fig. 3 (A) and (B) present the hole momentum distribution 1 − n(k) as a function of kx for fixed ky = 2π/3 in the 3-leg ladder and ky = π/2 in the 4-leg ladder, respectively. The value of ky is chosen in a way that the “sudden change” in 1 − n(k) can reach maxima by varying kx, according to the contour plots in the kx-ky plane (see Supplementary Information). A very interesting feature is that after the rescaling: 1 − n(k) → [1 − n(k)]N, all the curves in the inset of Fig. 3(A) [or (B)] collapse onto a universal curve shown in the corresponding main panel. If one defines the Fermi surface by the sudden jump in the momentum distribution function, then the two universal curves suggest that the quasiparticle spectral weight is upper-bounded by 1/N for large N and vanishes in the thermodynamic limit.
To satisfy the sum rule, , the width of the jump in 1 − n(k) must remain finite in the limit N → ∞. This is clearly shown in Fig. 3 (A) and (B), consistent with a finite localization length in the real space. We have also calculated the hole momentum distribution at different ratios of t/J. As shown in Supplementary Information, for a given sample size, the jump near the Fermi point is continuously reduced with increasing t/J, which is qualitatively consistent with earlier work12.
Again a sharp contrast arises once the phase string is turned off in the σ ·t-J model, as shown in Fig. 3(C) for the 4-leg ladder. Here the wide spread of 1 − n(k) in the momentum space seen in (A) and (B) collapses into a sharp peak at kx,ky = 0. In particular, a universal curve (the inset) is obtained by the rescaling: kx → Nxkx instead of by 1 − n(k) → [1 − n(k)]N as done in the main panel. This clearly indicates that the quasiparticle spectral weight is finite and a Bloch-like state is restored with a definite momentum at k = 0 (a peak at the equivalent of kx, ky = π is also found).
Spin degree of freedom
Complementary to the charge localization illustrated in Fig. 2, we further explore the fate of the spin-1/2 associated with the hole injected into the half-filled spin-singlet background.
For the 3-leg ladder, the spin-1/2 is explicitly separated from the charge as demonstrated by Fig. 4(A). Here the single hole is created by removing a ↓ spin electron. While the charge of the doped hole is well localized at the sample center, the extra spin of Sz = 1/2 spreads over the sample. It is indicated by spin density as well as the coarse grained , which is approximately uniform across the ladder. This is probably the most direct display of electron fractionalization for a doped Mott insulator, thanks to the charge localization.
By contrast, for an even-leg ladder, because of the presence of a spin gap in the charge-free spin background, the extra spin of Sz = 1/2 tends to stay in the hole region in order to reduce its superexchange energy cost, as illustrated in Fig. 4(B) for the 2-leg ladder case. In order to examine properly how the charge and spin associated with the doped hole behave, one has to resort to a different method.
Note that, first, if the charge part – namely the holon – is localized, the localization center can be anywhere in a translationally invariant system. In particular, an “extended” profile as a linear superposition of the localized wave packets at different positions should be also energetically degenerate. Second, if Fig. 4(B) really corresponds to spin-charge separation, the extra spin-1/2 – namely the spinon – should be more or less “free” within the regime expanded by the charge distribution. Then the spinon will prefer a more extended distribution of the hole to further lower its energy. In other words, the degeneracy of localized states should be lifted in favor of an extended profile in order to gain additional spinon energy.
Indeed, by increasing DMRG sweep number with the truncation error reaching much lower than 10−8, the localized profile in Fig. 4(B) is found to slowly converge to an extended one as shown in (C) with the total energy lowered by ~ 10−4 J. To identify the nature of this small energy gain, one may vary the sample size from Nx = 16 to 800 and repeat the same procedure to obtain the one-hole energy at each Nx [with the same full convergence to the extended charge profile as in Fig. 4(C)]. As shown in the inset of Fig. 5(A), with a constant term excluded, is well fitted by α(π/Nx)2 (blue triangles) with the coefficient α = 0.87 J, as if it is contributed by some “free particle” in a box of length Nx30.
Next, we show that such (finite-size) contribution to is not from the charge sector. For this purpose, we make the 2-leg ladder as a ribbon by connecting the boundaries on the two edges of the ladder in the x-direction. Then we calculate the energy difference with threading through a flux π into the ribbon. It corresponds to the change of boundary condition from the periodic to anti-periodic one for the hopping term and is equivalent to coupling a small electric field to the charge sector. As shown in Fig. 5(A), oscillates strongly and falls off exponentially as with ξ ~ 14.5. It behaves completely different from behavior exhibited in , indicating that the charge indeed remains localized. The “free particle-like” behavior in should therefore solely originate from the charge-neutral part of the doped hole, i.e., the spinon.
By sharp contrast, upon turning off the phase-string in the σ · t-J model, both and follow the same behavior as clearly shown in the inset of Fig. 5(A). It is consistent with the previous conclusion that in this case the doped hole is restored as a quasiparticle, which carries both charge and spin and thus responds very similarly to the boundary condition (i.e., the finite-size effect) as a single mobile object.
The degenerate charge localized states can be superposed to form a more “extended” distribution to minimize the spinon energy due to the residual spin-charge interaction,. It has been shown31 that generally the DMRG method tends to pick up a minimally entangled state among quasi-degenerate states. Thus, spatially localized ones such as those in Fig. 2 are naturally obtained because a further spinon energy gain for a bigger FWHM would be too tiny to be detected with a given small DMRG truncation error. It also explains why the FWHM of charge distribution shown in Figs. 2 and 4 is usually bigger than the intrinsic localization length ξ as exhibited by . But the former is still valid to characterize the general trend of the localization, say, as a function of the leg number in Fig. 2. On the other hand, by adding some weak local chemical potentials, the quasi-degeneracy of the hole states can be lifted such that the hole density profile is truly localized around the impurities at different locations [as indicated by different colored curves in Fig. 4(D) for a N = 400 × 2 ladder]. Here the increase of the total energy of the original t-J Hamiltonian is weak (about 10−4 J), presumably from the spinon part as the FWHM is still larger than ξ.
Finally, the spin-charge separation is well-known for the one-dimensional chain2. Figure 5(B) presents the corresponding 1-leg results. As shown in the inset, the finite-size effect of is indistinguishable from the phase string free case (with open boundary conditions). But the charge response of is again totally different [the main panel of Fig. 5(B)]. It oscillates strongly as a function of Nx, similar to the 2-leg case in Fig. 5(A). As a matter of fact, it can be directly attributed to the phase string modulation in the expression for the ground state energy given in Ref. 17. The main difference from the 2-leg case is that the envelop of decays with increasing Nx in a power law fashion () instead of an exponential one. This is consistent with the fact that the holon is not localized in the one-dimensional case. It is interesting to notice that even without the phase string effect, and behave distinctly for the σ · t-J model. The former , while the latter , also indicating a spin-charge separation although the distinction is much less dramatic as compared to the t-J model.
Charge self-localization is a striking result of a single-hole-doped Mott insulator. However, for this novel effect to get fully unveiled, a large sample is needed. Instead of tackling directly a two-dimensional square lattice, in this work, we have chosen ladders that the DMRG method can access. As it turns out, very surprising results show up so long as the ladders are long enough, and, there are more than one paths to realize quantum interference, e.g., in a two-leg system.
The most essential physics underlying the observed exotic phenomena is that the motion of the single hole acquires a sequence of signs that precisely and permanently record each microscopic hole-hopping-spin-backflow event in the quantum spin background. These irreparable phase strings cause singular and destructive interference of quantum waves of the charge. As the distance of wave propagation increases, effects of destructive interference become stronger and stronger. The present results show unequivocally that the self-localization of the charge, irrespective of even or odd ladders, is a combined effect of quantum interference and multiple scattering between the doped charge and spin background, in analogy to Anderson localization32. This analogy notwithstanding, their nature is fundamentally different: The charge self-localization arises purely from strong electron correlation in clean systems; whereas Anderson localization from disorders in noninteracting electron systems. Consistent with the picture of charge self-localization above, in the single chain case, since quantum interference involving different paths is absent, the doped charge is delocalized.
The irreparable phase string effect is fundamentally different from the premise for a spin polaron picture – a conventional wisdom in which the disturbance of the hole hopping to the spin background is described by virtual spin excitations that eventually relax back after the hole moves away. In fact, the spin-polaron or quasiparticle behavior has been shown to be recovered once the phase string is “switched off” in the so-called σ · t-J model, where everything seems “normal” in a conventional sense. Here, a spin-charge recombination with a good kinetic energy for the quasiparticle can be realized since there is no more singular phase string effect to strongly suppress the kinetic energy of the charge.
Phase strings have been proved27 rigorously as the sole sign structure in the t-J model on bipartite lattices, regardless of doping concentration, temperature and dimensions. As such, the present work may provide significant insights into the long-standing issue of high temperature superconductivity in the cuprates at finite doping. One may point out that for the realistic materials, the t-J model needs modified. For example, a non-bipartite lattice with a finite next-nearest-neighboring hopping integral t′ or the Hubbard model with an intermediate on-site repulsion U is probably more relevant than the simpliest t-J model. We have numerically checked that the single-hole localization remains robust so long as t′ is small (e.g., t′/t < 0.2 for the 3-leg ladder at t = 3 J), or in a Hubbard model, at least, with U/t > 10. It suggests that the generic localization found26 in the lightly doped cuprates may intrinsically belong to the new paradigm revealed in this work.
The numerical simulations in this work are performed by using the standard DMRG method. For Fig. 5, because the systems involved are small, we performed the simulation for both the open and periodic boundary conditions. For other results, the systems involved are large and we adopted the open boundary condition due to the numerical difficulty. In DMRG simulations, we keep up to m = 5000 states in the DMRG block with up to 40 sweeps to get converged results. For the measurement of the ground-state energy and other observables, the total truncation error is of the order or less than 10−8 ~ 10−12.
To examine the validity of our numerical method, we calculated the ground-state energy for small systems and compared it with that obtained by the exact diagonalization method. The results are in excellent agreement. We also calculated the spin-spin correlation functions of the Heisenberg ladders (half-filled t-J ladders). The results are consistent with those reported in earlier works (see Supplementary Information for details).
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Stimulating discussions with L. Balents, D. N. Sheng, S. R. White, J. Zaanen and especially P. A. Lee are acknowledged. This work was partially supported by the KITP (NSF no. PHY05-51164) and the Center for Scientific Computing at the CNSI and MRL: the NSF MRSEC (DMR 1121053) and NSF CNS-0960316; by the NBRPC (nos. 2009CB929402, 2010CB923003 and 2011CBA00108); by the NSFC (no. 11174174) and the Tsinghua University ISRP (no. 2011Z02151).
The authors declare no competing financial interests.
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Zhu, Z., Jiang, HC., Qi, Y. et al. Strong correlation induced charge localization in antiferromagnets. Sci Rep 3, 2586 (2013). https://doi.org/10.1038/srep02586
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