Zhongzheng Wu's research while affiliated with Zhejiang University and other places
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Publications (14)
The Yb-terminated and Bi-terminated (111) surface electronic structure of topological Kondo semimetal YbPtBi is investigated using both density-functional-theory (DFT) -based calculations and angle-resolved photoemission spectroscopy (ARPES). The cleavage plane is found to be between Yb-layers and Bi-layers in both experiment and theory, and the br...
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The competition between magnetic order and Kondo effect is essential for the rich physics of heavy fermion systems. Nevertheless, how such competition is manifested in the quasiparticle bands in a real periodic lattice remains elusive in spectroscopic experiments. Here we report a high-resolution photoemission study of the antiferromagnetic Kondo l...
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The competition between magnetic order and Kondo effect is essential for the rich physics of heavy fermion systems. Nevertheless, how such competition is manifested in the quasiparticle bands in a real periodic lattice remains elusive in spectroscopic experiments. Here we report a high-resolution photoemission study of the antiferromagnetic Kondo l...
Interfacial electron-phonon coupling in ultrathin films has attracted much interest recently. Here, by combining angle-resolved photoemission spectroscopy and scanning tunneling microscopy, we report quantized electronic states and strong interfacial electron-phonon coupling in ultrathin Yb films on graphite. We observed clear kinks in the energy-m...
The superconducting order parameter of the first heavy-fermion superconductor CeCu2Si2 is currently under debate. A key ingredient to understand its superconductivity and physical properties is the quasiparticle dispersion and Fermi surface, which remains elusive experimentally. Here, we present measurements from angle-resolved photoemission spectr...
The superconducting order parameter of the first heavy-fermion superconductor CeCu2Si2 is currently under debate. A key ingredient to understand its superconductivity and physical properties is the quasiparticle dispersion and Fermi surface, which remains elusive experimentally. Here we present measurements from angle-resolved photoemission spectro...
Using angle-resolved photoemission spectroscopy (ARPES) and low-energy electron diffraction (LEED), together with density-functional theory (DFT) calculation, we report the formation of charge density wave (CDW) and its interplay with the Kondo effect and topological states in CeSbTe. The observed Fermi surface (FS) exhibits parallel segments that...
Using angle-resolved photoemission spectroscopy (ARPES) and low-energy electron diffraction (LEED), together with density-functional theory (DFT) calculation, we report the formation of charge density wave (CDW) and its interplay with the Kondo effect and topological states in CeSbTe. The observed Fermi surface (FS) exhibits parallel segments that...
Using angle-resolved photoemission spectroscopy (ARPES) and resonant ARPES, we report evidence of strong anisotropic conduction-f electron mixing (c−f mixing) in CeBi by observing a largely expanded Ce 5d pocket at low temperature, with no change in the Bi 6p bands. The anisotropic Fermi surface (FS) expansion is accompanied by a pronounced spectra...
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Interfacial electron-phonon coupling in ultrathin films has attracted much interest; it can give rise to novel effects and phenomena, including enhanced superconductivity. Here we report an observation of strong kinks in the energy dispersions of quantum well states in ultrathin Yb films grown on graphite. These kinks, arising from interfacial elec...
Using angle-resolved photoemission spectroscopy (ARPES) and resonant ARPES, we report evidence of strong anisotropic conduction-f electron mixing (c-f mixing) in CeBi by observing a largely expanded Ce-5d pocket at low temperature, with no change in the Bi-6p bands. The Fermi surface (FS) expansion is accompanied by a pronounced spectral weight tra...
Combining angle-resolved photoemission spectroscopy and magnetotransport measurements, we systematically investigated the possible origin of the extreme magnetoresistance in Pr/Sm mono-antimonides/bismuthides (PrSb, SmSb, PrBi, SmBi). Our photoemission measurements reveal that the bulk band inversion and surface states are absent (present) in Pr/Sm...
Here we report the evolution of bulk band structure and surface states in rare-earth monobismuthides with partially filled f shell. Utilizing synchrotron-based photoemission spectroscopy, we determined the three-dimensional bulk band structure and identified the bulk band inversions near the X points, which, according to the topological theory, cou...
Here we report the bulk band structure, existence and evolution of topological surface states in rare earth mono-bismuthides, many of which exhibit pronounced magnetic transitions at low temperature due to partially filled f shell. Utilizing synchrotron-based photoemission spectroscopy, we determined the three-dimensional bulk band structure, despi...
Citations
... Below T , the decrease of A 2 and the saturation of τ 2 suggest that the hybridization process may be suppressed. In Ce-based HF materials, the Kondo effect and magnetic order promote and inhibit hybridization, respectively [46,47]. This means that the transition occurring at T is unlikely to be associated with the Kondo effect [17][18][19], but rather the onset of short-range magnetic order [17] or a combination of the Kondo effect and the onset of short-range magnetic order [17]. ...
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... So far, many of the properties of Yb remain not fully understood due to a discrepancy between the experimental and theoretical electronic band structures. Photoemission spectroscopy on close-packed Yb surfaces presents a peaked density of states close to the Fermi level [17][18][19][20][21][22][23][24]. Resistivity and Hall data on bulk Yb [14,25] and scanning tunneling spectroscopy on thin Yb films grown on W(110) [26,27] suggest the existence of an electron pocket at the center of the surface Brillouin zone ( ). ...
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... In a three-dimensional (3D) system, FS nesting gives rise to very rich low-temperature phases due to quasiparticle interaction. FS nesting has been widely studied in high-temperature superconductors [2,4], charge density waves (CDW) [5][6][7], and heavy Fermion (HF) compounds [8][9][10][11][12]. ...
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... The k x − k z FS exhibits multiple parallel lines, revealing strong two-dimensional characteristics of the electronic structure of PrSbTe along the k z direction. Because of the weak interlayer coupling, ARPES spectra of PrSbTe show weak k z dispersion, which is like the two-dimensional characteristics of FS reported in isomorphic compounds, such as ZrSiS [40] and CeSbTe [41]. ...
... 16 Peaks F and H in Figure 3C might correspond to the satellite peak induced by the SOC interaction of j = 7/2 manifold, and j = 7/2 Hubbard bands, respectively. 32 ...
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... PrBi has been reported to exhibit nontrivial Berry phase and quadrupolar moment 24 , whereas topological quantum phase transition has been proposed in HoSb 25 . Several antiferromagnets among REPn family have been reported to demonstrate XMR 12,15,26,27 . Interestingly, it has been proposed that within RESb and REBi series topological phase transitions could occur close to SmSb and DyBi, respectively 28 . ...
... A first-principle calculation predicted a systematic band inversion reduction from Ce to Yb compounds, and a topologically non-trivial to trivial transition occurs around SmSb and DyBi 10 . Later angle-resolved photoemission spectroscopy (ARPES) experiments confirmed the band inversion in rare-earth monobismuthides and identified linear-dispersed Dirac-like states [11][12][13][14] . Magnetotransport experiments revealed non-trivial Berry phase in SmBi 15 and SmSb 16 , and possible Weyl or Dirac fermions in CeSb and NdSb when driving the samples to ferromagnetic phase with magnetic field or pressure [17][18][19] . ...
... We found no signature of topological Dirac-cone SS at theΓ andM points [see Fig. 1(e)] unlike the case of RBi [24,[34][35][36][37], consistent with the absence of the band inversion, signifying that NdSb is a topologically trivial semimetal in the PM phase. The FS mapping in the PM phase shown in Fig. 1(g) is consistent with the non-topological semimetallic character because only bulk-derived electron and hole pockets are identified. ...
