Cuprates & the Pairing Mechanism
High-Tc cuprates, the Hubbard model and its numerics, the pseudogap, strange-metal transport, charge order and d-wave pairing.
Most influential
- Unconventional superconductivity in magic-angle graphene superlattices
The understanding of strongly-correlated materials, and in particular unconventional superconductors, has puzzled physicists for decades. Such difficulties have stimulated new research paradigms, such as ultra-cold atom lattices for simulating quantum materials. Here we report on the realization of intrinsic unconventional superconductivity in a 2D superlatt…
Article8,329 citationsarXiv:1803.02342doi:10.1038/nature26160 - Signatures of superconductivity near 80 K in a nickelate under high pressure
High-transition-temperature (high-T_c) superconductivity in cuprates has been discovered for more than three decades, but the underlying mechanism remains a mystery. Cuprates are the only unconventional superconducting family that host bulk superconductivity with T_cs above the liquid nitrogen boiling temperature at 77 Kelvin. Here we report an observation o…
Article748 citationsarXiv:2305.09586doi:10.1038/s41586-023-06408-7 - Light-Induced Superconductivity in a Stripe-Ordered CuprateArticle1,204 citationsdoi:10.1126/science.1197294
- Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3O6.67
Superconductivity often emerges in the proximity of, or in competition with, symmetry breaking ground states such as antiferromagnetism or charge density waves (CDW)1-5. A number of materials in the cuprate family, which includes the high-transition-temperature (high-Tc) superconductors, show spin and charge density wave order5-7. Thus a fundamental question…
Article1,091 citationsarXiv:1206.4333doi:10.1038/nphys2456 - Unconventional chiral charge order in kagome superconductor KV3Sb5
Intertwining quantum order and nontrivial topology is at the frontier of condensed matter physics. A charge density wave (CDW) like order with orbital currents has been proposed as a powerful resource for achieving the quantum anomalous Hall effect in topological materials and for the hidden phase in cuprate high-temperature superconductors. However, the exp…
Article746 citationsarXiv:2012.15709doi:10.1038/s41563-021-01034-y - Magnetic-field-induced charge-stripe order in the high-temperature superconductor YBa2Cu3Oy
Electronic charges introduced in copper-oxide planes generate high-transition temperature superconductivity but, under special circumstances, they can also order into filaments called stripes. Whether an underlying tendency of charges to order is present in all cuprates and whether this has any relationship with superconductivity are, however, two highly con…
Article755 citationsarXiv:1109.2011doi:10.1038/nature10345 - Interface-induced superconductivity and strain-dependent spin density waves in FeSe/SrTiO3 thin films
The record of superconducting transition temperature(Tc) has long been 56K for the iron-based high temperature superconductors(Fe-HTS's). Recently, in single layer FeSe films grown on SrTiO3 substrate, signs for a new 65K Tc record are reported. Here with in-situ photoemission measurements, we substantiate the presence of the spin density wave(SDW) in FeSe f…
Article692 citationsarXiv:1301.2748doi:10.1038/nmat3654 - High-temperature superconductivity with zero-resistance and strange metal behavior in La$_{3}$Ni$_{2}$O$_{7-δ}$
Recently signatures of superconductivity were observed close to 80 K in \LN\ under pressure. This discovery positions \LN\ as the first bulk nickelate with high-temperature superconductivity, but the lack of zero resistance presents a significant drawback for validating the findings. Here we report pressure measurements up to over 30 GPa using a liquid press…
Article309 citationsarXiv:2307.14819doi:10.1038/s41567-024-02515-y - Ubiquitous Interplay Between Charge Ordering and High-Temperature Superconductivity in Cuprates
Besides superconductivity, copper-oxide high temperature superconductors are susceptible to other types of ordering. We use scanning tunneling microscopy and resonant elastic x-ray scattering measurements to establish the formation of charge ordering in the high-temperature superconductor Bi2Sr2CaCu2O8+x. Depending on the hole concentration, the charge order…
Article595 citationsarXiv:1312.1347doi:10.1126/science.1243479 - Symmetry-breaking orbital anisotropy observed for detwinned Ba(Fe 1- x Co x ) 2 As 2 above the spin density wave transition
Nematicity, defined as broken rotational symmetry, has recently been observed in competing phases proximate to the superconducting phase in the cuprate high temperature superconductors. Similarly, the new iron-based high temperature superconductors exhibit a tetragonal to orthorhombic structural transition (i.e. a broken C4 symmetry) that either precedes or …
Article515 citationsarXiv:1011.0050doi:10.1073/pnas.1015572108 - Direct evidence for a competition between the pseudogap and high temperature superconductivity in the cuprates
A pairing gap and coherence are the two hallmarks of superconductivity. In a classical BCS superconductor they are established simultaneously at Tc. In the cuprates, however, an energy gap (pseudogap) extends above Tc. The origin of this gap is one of the central issues in high temperature superconductivity. Recent experimental evidence demonstrates that the…
Article275 citationsarXiv:0902.1342doi:10.1038/nature07644 - Charge density wave origin of cuprate checkerboard visualized by scanning tunneling microscopy
One of the main challenges in understanding high TC superconductivity is to disentangle the rich variety of states of matter that may coexist, cooperate, or compete with d-wave superconductivity. At center stage is the pseudogap phase, which occupies a large portion of the cuprate phase diagram surrounding the superconducting dome [1]. Using scanning tunneli…
Article371 citationsarXiv:0806.0203doi:10.1038/nphys1021 - Twisted Hubbard Model for Sr2IrO4: Magnetism and Possible High Temperature Superconductivity
Sr2IrO4 has been suggested as a Mott insulator from a single J_eff=1/2 band, similar to the cuprates. However this picture is complicated by the measured large magnetic anisotropy and ferromagnetism. Based on a careful mapping to the J_eff=1/2 (pseudospin-1/2) space, we propose that the low energy electronic structure of Sr2IrO4 can indeed be described by a …
Article468 citationsarXiv:1011.3500doi:10.1103/physrevlett.106.136402 - Intense paramagnon excitations in a large family of high-temperature superconductors
In the search for the mechanism of high-temperature superconductivity, intense research has been focused on the evolution of the spin excitation spectrum upon doping from the antiferromagnetic insulating to the superconducting states of the cuprates. Because of technical limitations, the experimental investigation of doped cuprates has been largely focused o…
Article453 citationsarXiv:1106.2641doi:10.1038/nphys2041 - Superconductivity in Novel BiS 2 -Based Layered Superconductor LaO 1- x F x BiS 2
Layered superconductors have provided some interesting fields in condensed matter physics owing to the low dimensionality of their electronic states. For example, the high-Tc (high transition temperature) cuprates and the Fe-based superconductors possess a layered crystal structure composed of a stacking of spacer (blocking) layers and conduction (supercondu…
Article429 citationsarXiv:1207.3558doi:10.1143/jpsj.81.114725
Newest work
- Phonon Fluctuations Enhanced Superconductivity in a Three-Band Cuprate ModelPreprintarXiv:2610.39710
- Electronic liquid crystals and superconductivity from doping a moiré Mott insulatorPreprintarXiv:2610.39978
- Chiral $p$-Wave Superconductivity Proximate to a Fractional Chern Insulator and a Topological Charge Density Wave in a Moiré Chern BandPreprintarXiv:2610.40469
- Direct real-space imaging of sign-reversal superconducting state by scanning Josephson tunnelingPreprintarXiv:2610.38421
- Ground-State Properties of a Lattice-Coupled Strongly Correlated Model for Solid Oxygen under PressurePreprintarXiv:2610.36697
- Structural supermodulation enables resonant Raman determination of crystalline orientation in Bi2Sr2CaCu2O8+x flakesPreprintarXiv:2610.36995
- New Developments in Diagrammatic Monte Carlo for Interacting Lattice Fermions: Efficient Algorithms and ApplicationsPreprintarXiv:2610.37505
- Topological Criticality with Charge-\(3e\) Fluctuations in the \(\mathrm{SU}(3)\) Triangular-Lattice Hofstadter--Hubbard ModelPreprintarXiv:2610.37575
- A $B_{1g}$ phonon unlocks $d$-wave superconductivity in the repulsive Hubbard modelPreprintarXiv:2610.37746
- Field theory of competing phases in the interacting Kitaev chainPreprintarXiv:2610.37761