Article
Physics, Multidisciplinary
Titus Neupert, M. Michael Denner, Jia-Xin Yin, Ronny Thomale, M. Zahid Hasan
Summary: Superconductivity and ordered states have been observed in a family of kagome materials, with lattice geometry, topological electron behavior, and competition between ground states playing key roles in determining material properties. The compounds KV3Sb5, CsV3Sb5, and RbV3Sb5 exhibit a kagome net of vanadium atoms, showing superconductivity at low temperatures and unusual charge order at high temperatures, connecting to the underlying topological nature of the band structure. This highlights the importance of these discoveries in the context of wider research efforts in topological physics and superconductivity, while also discussing open problems in this field.
Article
Materials Science, Multidisciplinary
Yongkai Li, Qing Li, Xinwei Fan, Jinjin Liu, Qi Feng, Min Liu, Chunlei Wang, Jia-Xin Yin, Junxi Duan, Xiang Li, Zhiwei Wang, Hai-Hu Wen, Yugui Yao
Summary: The coexistence of superconductivity and charge-density wave (CDW) order in kagome systems has sparked great interest. In this study, Cs(V1-xNbx)3Sb5 samples with systematic Nb doping were extensively investigated, and it was found that Nb doping leads to the suppression of CDW order and the promotion of superconductivity. Additionally, the anomalous Hall effect (AHE) and magnetoresistance (MR) were significantly weakened along with the CDW order. The effects were interpreted through density-functional calculations and antiphase shifts of the Fermi energy near saddle points and a Fermi surface reorganization. The results uncovered a delicate and unusual competition between CDW order and superconductivity.
Article
Multidisciplinary Sciences
Weijiong Chen, Clara Neerup Breio, Freek Massee, Milan P. Allan, Cedomir Petrovic, J. C. Seamus Davis, Peter J. Hirschfeld, Brian M. Andersen, Andreas Kreisel
Summary: The authors used scanning tunneling microscopy to detect the orbital order in the superconductor CeCoIn5, which is enhanced in the superconducting state as predicted. Visualization of atomic-orbital degrees of freedom is a challenge in scanned microscopy. Sublattice-resolved superconductive QPI techniques represent a new approach for studying hidden orbital order.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Shiwei Shen, Chenhaoping Wen, Pengfei Kong, Jingjing Gao, Jianguo Si, Xuan Luo, Wenjian Lu, Yuping Sun, Gang Chen, Shichao Yan
Summary: Researchers demonstrate a transition from an insulating gap to a tunable Kondo resonance in 1T-TaS2 by Pb intercalation, providing a pathway for creating and tuning many-body electronic states in layered narrow-electronic-band materials.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Subhasree Pradhan
Summary: We studied a Falicov-Kimball model with triplet pairing on a square lattice in the presence of a transverse magnetic field. The original model leads to charge-density wave (CDW) at half-filling, while the inclusion of a triplet pairing term allows for the coexistence of superconductivity and charge order under certain strengths of Coulomb interaction. Strong correlation suppresses the superconductivity pairing and maximizes the CDW order. The hopping term takes into account the effect of an orbital magnetic field through Peierls' substitution, which affects the pairing condensation and CDW formation differently depending on the range of Coulomb correlation. Some magnetic fields enhance CDW while decreasing the superconductivity pairing. In the low interaction regime, a gapped system becomes gapless under the influence of orbital magnetic fields.
Article
Physics, Multidisciplinary
Shi Meng-Zhu, Kang Bao-Lei, Meng Fan-Bao, Wu Tao, Chen Xian-Hui
Summary: Abundant novel physical properties have been observed in thin-flake samples of two-dimensional correlated electronic systems prepared by mechanical exfoliation. Developing new methods of preparing bulk two-dimensional samples can further understand the low-dimensional system by combining traditional bulk characterization methods like X-ray diffraction, magnetic susceptibility and specific heat measurements. It is possible to maintain the novel properties of thin-flake samples in bulk state and promote these novel physical properties for potential applications. This article introduces a class of organic molecular intercalation methods to regulate two-dimensional correlated electronic systems, focusing on the changes of structure and physical properties of two-dimensional materials after organic molecular intercalation. The applications of organic molecular intercalation method in regulating thermoelectricity, two-dimensional magnetism, charge density wave and two-dimensional superconductivity are also presented.
ACTA PHYSICA SINICA
(2022)
Article
Chemistry, Physical
Junzhang Ma, Simin Nie, Xin Gui, Muntaser Naamneh, Jasmin Jandke, Chuanying Xi, Jinglei Zhang, Tian Shang, Yimin Xiong, Itzik Kapon, Neeraj Kumar, Yona Soh, Daniel Gosalbez-Martinez, Oleg Yazyev, Wenhui Fan, Hannes Huebener, Umberto De Giovannini, Nicholas Clark Plumb, Milan Radovic, Michael Andreas Sentef, Weiwei Xie, Zhijun Wang, Christopher Mudry, Markus Mueller, Ming Shi
Summary: Using angle-resolved photoemission spectroscopy, the authors detected mobile bound states of excitons in quasi-one-dimensional metallic TaSe3, providing evidence for the elusive exciton mobility in metals.
Article
Materials Science, Multidisciplinary
Yihan Zhang, Hongnan Wu, Yajing Sun, Shuyu Li, Si Liu, Lei Zheng, Lingjie Sun, Fangxu Yang, Xiaotao Zhang, Wenping Hu
Summary: This paper presents a multi-stimuli responsive cocrystal system with luminescent properties that can be dynamically controlled and demonstrates the responsive mechanism of cocrystals under multiple stimuli (acid/alkali vapor, force, and heat). The research shows that the response time of the cocrystal is in the order of seconds, much superior to previously reported stimuli-responsive cocrystals, and a high-sensitive fluorescence switching can be demonstrated under multiple stimuli.
SCIENCE CHINA-MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Limin Yan, Chi Ding, Mingtao Li, Ruilian Tang, Wan Chen, Bingyan Liu, Kejun Bu, Tianheng Huang, Dongzhe Dai, Xiaobo Jin, Xiaofan Yang, Erjian Cheng, Nana Li, Qian Zhang, Fengliang Liu, Xuqiang Liu, Dongzhou Zhang, Shuailing Ma, Qiang Tao, Pinwen Zhu, Shiyan Li, Xujie Lu, Jian Sun, Xin Wang, Wenge Yang
Summary: This study investigates the interaction between superconductivity (SC) and charge-density wave (CDW) in 2D van der Waals heterostructures (VDWHs), specifically in bulk 4Hb-TaSe2 consisting of alternating 1T-TaSe2 and 1H-TaSe2 monolayers. Surprisingly, the superconductivity competes with the CDW order in 4Hb-TaSe2, resulting in enhanced superconductivity under compression. The results provide a method to efficiently control the interplay between SC and CDW in VDWHs.
Article
Chemistry, Physical
Changhua Li, Yunlong Su, Cuiwei Zhang, Cuiying Pei, Weizheng Cao, Qi Wang, Yi Zhao, Lingling Gao, Shihao Zhu, Mingxin Zhang, Yulin Chen, Youguo Shi, Gang Li, Yanpeng Qi
Summary: This study systematically investigates the electronic responses of ZrRuAs under external pressure, revealing different electronic properties at different pressures. The superconducting transition temperature of ZrRuAs increases with pressure and reaches a maximum value at a certain pressure before decreasing, while the nontrivial topology of this material remains robust under high pressure.
Article
Chemistry, Physical
Sen Zhang, Fangfang Xing, Ling Chen, Xiujuan Wang, Xiaoming He
Summary: This study systematically investigates the impact of the location of redox-active sites in conjugated polymers on electrochemistry and battery performance. The results demonstrate that redox-pendant and meta junction are two effective features for designing high-performance energy storage polymers.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
T. T. Saraiva, L. I. Baturina, A. A. Shanenko
Summary: Recent research has shown that the pair-exchange coupling between quasi-one-dimensional (Q1D) bands and conventional higher-dimensional bands in a multiband superconducting material can lead to the formation of a robust aggregate pair condensate, even with the presence of nearly shallow higher-dimensional bands. This sheds new light on the strong superconducting state observed in chain-like-structured superconducting materials A(2)Cr(3)As(3) (A = K, Rb, Cs).
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Multidisciplinary Sciences
Maine Christos, Zhu-Xi Luo, Henry Shackleton, Ya-Hui Zhang, Mathias S. Scheurer, Subir Sachdev
Summary: Confined quantum spin liquid in hole-doped cuprates is described in this article. The spin liquid is described by a SU(2) gauge theory of Nf = 2 massless Dirac fermions. Confinement is argued to occur via the Higgs condensation of bosonic chargons carrying fundamental SU(2) gauge charges. At half-filling, there is a low-energy theory of the Higgs sector with Nb=2 relativistic bosons and an emergent SO(5)b global symmetry. A conformal SU(2) gauge theory with Nf=2 fundamental fermions, Nb=2 fundamental bosons, and a SO(5)f x SO(5)b global symmetry is proposed, which describes a deconfined quantum critical point.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Materials Science, Multidisciplinary
Giovanni Midei, Andrea Perali
Summary: Investigating the properties of two-dimensional multiband superconductors and electron-hole superfluids with tunable energy gap and pairing of electrons in different channels is important. The electronic configuration also allows us to study the coexistence of superconductivity and charge-density waves in underdoped cuprates and transition metal dichalcogenides. Numerical results for superconducting gaps, chemical potential, condensate fractions, coherence lengths, and superconducting mean-field critical temperature have been obtained using a mean-field approach, considering a tunable band gap and different fillings of the conduction band.
Article
Physics, Multidisciplinary
Alfred Zong, Pavel E. Dolgirev, Anshul Kogar, Yifan Su, Xiaozhe Shen, Joshua A. W. Straquadine, Xirui Wang, Duan Luo, Michael E. Kozina, Alexander H. Reid, Renkai Li, Jie Yang, Stephen P. Weathersby, Suji Park, Edbert J. Sie, Pablo Jarillo-Herrero, Ian R. Fisher, Xijie Wang, Eugene Demler, Nuh Gedik
Summary: Engineering novel states of matter with light is a cutting-edge area of materials research, with a focus on realizing broken-symmetry phases through ultrashort laser pulses. Experimental findings suggest that light-induced CDW consists solely of order parameter fluctuations, similar to critical fluctuations in equilibrium. These results indicate that materials with strong equilibrium fluctuations may host hidden orders after laser excitation.
PHYSICAL REVIEW LETTERS
(2021)
Article
Urology & Nephrology
Jens Rassweiler, Philip Rieker, Rainer Pecha, Martin Dressel, Marie-Claire Rassweiler-Seyfried
Summary: A comparison was made between low-pressure wide focus and high-pressure small focus electromagnetic shockwave sources to evaluate their efficacy in stone fragmentation. Significant differences were found in the initial fragmentation process, while no significant difference was observed in achieving complete disintegration.
JOURNAL OF ENDOUROLOGY
(2022)
Article
Chemistry, Physical
M. A. Belyanchikov, Z. Bedran, M. Savinov, P. Bednyakov, P. Proschek, J. Prokleska, V. A. Abalmasov, E. S. Zhukova, V. G. Thomas, A. Dudka, A. Zhugayevych, J. Petzelt, A. S. Prokhorov, V. B. Anzin, R. K. Kremer, J. K. H. Fischer, P. Lunkenheimer, A. Loidl, E. Uykur, M. Dressel, B. Gorshunov
Summary: This study investigates the collective modes and single-particle excitations of water molecules confined within nanocages using comprehensive broad-band dielectric spectroscopy, specific heat studies, and molecular dynamics and Monte Carlo simulations. The results show that the confined water molecules exhibit rich anisotropic temperature-dependent excitations, and a ferroelectric order-disorder phase transition is confirmed at approximately 3 K.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ece Uykur, Brenden R. Ortiz, Stephen D. Wilson, Martin Dressel, Alexander A. Tsirlin
Summary: In this study, we discover unconventional localized carriers with strong renormalization across the density-wave transition in KV3Sb5 through optical spectroscopy and density-functional calculations. We also observe strong phonon anomalies not only below the density-wave transition, but also at high temperatures, indicating a complex interplay between phonons and the underlying electronic structure. We propose star-of-David and tri-hexagon configurations for the density-wave order in KV3Sb5, which resemble the p-wave states expected in the Hubbard model on the kagome lattice with van Hove singularity filling.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Alexander A. Tsirlin, Pierre Fertey, Brenden R. Ortiz, Berina Klis, Valentino Merkl, Martin Dressel, Stephen D. Wilson, Ece Uykur
Summary: The pressure evolution of the superconducting kagome metal CsV3Sb5 is studied using experimental and computational methods. The results show that pressure leads to a highly anisotropic compression due to the fast shrinkage of the Cs-Sb distances and suppression of Cs rattling motion. Additionally, it is found that Sb atoms play a central role in stabilizing the three-dimensional charge-density wave and Fermi surface reconstruction.
Article
Chemistry, Multidisciplinary
Mikhail A. Belyanchikov, Maxim Savinov, Petr Proschek, Jan Prokleska, Elena S. Zhukova, Victor G. Thomas, Zakhar V. Bedran, Filip Kadlec, Stanislav Kamba, Martin Dressel, Boris P. Gorshunov
Summary: In this study, the radio frequency dielectric response of a system composed of water molecules arranged in nanocages was investigated. Quantum effects were found to dominate the properties of the electric dipolar system at low temperatures. By comparing with conventional quantum paraelectrics, clear signatures of quantum-critical behavior were observed.
Article
Physics, Condensed Matter
Boris Gorshunov, Veniamin Abalmasov, Vladimir Uskov, Yuk Tai Chan, Ece Uykur, Pavel Abramov, Martin Dressel, Victor Thomas, Maxim Savinov
Summary: The quasistatic dielectric permittivity of D2O type I molecules in hydrothermally grown beryl crystals was measured under different internal pressures and D2O type II molecule contents. It was found that all crystals exhibited quantum paraelectric behavior, with permittivity increasing and then saturating below a certain temperature. The data analysis showed that excess internal pressure and excess content of D2O-II molecules led to increased quantum temperature and decreased Curie constant, while the Curie temperature remained unchanged. The enhanced quantum effects in the dipole-dipole-coupled D2O-I molecules were attributed to the enhanced azimuthal tunneling within the hexagonal localizing potential. The study suggests the potential of using crystal growth conditions to control the strength of quantum effects in polar water molecule networks.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Samuel W. Pinnock, Seulki Roh, Tobias Biesner, Artem V. Pronin, Martin Dressel
Summary: In this article, we demonstrated the effective generation of vortex terahertz (THz) beams with angular momenta P = +/- 1 and P = +/- 2 using 3-D printed spiral phase plates (SPPs). The generation of vortex beams was confirmed through frequency-domain transmission spectroscopy. The topological charge P of the vortex beams was determined using phase-sensitive Mach-Zehnder interferometry, and the resulting interference patterns supported the expected intensity distributions for the given P, providing strong evidence for the spatial phase structure of the generated THz vortex beams.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)
Article
Instruments & Instrumentation
Yuk Tai Chan, Ece Uykur, Martin Dressel
Summary: In this study, we present the modifications, performance, and test of a diamond anvil cell for radio frequency dielectric spectroscopy studies of single crystals. The modified pressure cell can be used from room temperature down to 4 K and up to pressures of 5-6 GPa, allowing continuous frequency-dependent measurements between 5 Hz and 1 MHz. With an excellent performance and a stray capacitance of around 2 pF that is temperature-, frequency-, and pressure-independent, this cell enables the use of relatively small samples with a weak dielectric response.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Multidisciplinary Sciences
Hao Chu, Sergey Kovalev, Zi Xiao Wang, Lukas Schwarz, Tao Dong, Liwen Feng, Rafael Haenel, Min-Jae Kim, Parmida Shabestari, Le Phuong Hoang, Kedar Honasoge, Robert David Dawson, Daniel Putzky, Gideok Kim, Matteo Puviani, Min Chen, Nilesh Awari, Alexey N. Ponomaryov, Igor Ilyakov, Martin Bluschke, Fabio Boschini, Marta Zonno, Sergey Zhdanovich, Mengxing Na, Georg Christiani, Gennady Logvenov, David J. Jones, Andrea Damascelli, Matteo Minola, Bernhard Keimer, Dirk Manske, Nanlin Wang, Jan-Christoph Deinert, Stefan Kaiser
Summary: The authors observe a Fano resonance in the nonlinear THz response of La2-xSrxCuO4, which may arise from a coupling between superconducting and charge-density-wave amplitude fluctuations.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Petar Yordanov, Tim Priessnitz, Min-Jae Kim, Georg Cristiani, Gennady Logvenov, Bernhard Keimer, Stefan Kaiser
Summary: Intense terahertz radiation generation is achieved through the transverse thermoelectric effect in layered conducting transition metal oxides, where ultrafast out-of-plane temperature gradients induce in-plane thermoelectric currents, allowing efficient emission of the terahertz field. This simplified method provides a promising avenue for highly versatile terahertz sources and integrable emitter elements.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Cenk Beydeda, Konstantin Nikolaou, Marius Tochtermann, Nikolaj G. Ebensperger, Gabriele Untereiner, Ahmed Farag, Philipp Karl, Monika Ubl, Harald Giessen, Martin Dressel, Marc Scheffler
Summary: This paper discusses various experimental strategies to distinguish designed and spurious modes in coplanar superconducting resonators that are operated in a broad frequency range. These strategies include tracking resonance evolution with temperature, magnetic field, and microwave power. It is also found that local modification of the resonator can lead to characteristic signatures in different resonance modes depending on the local strength of the electric or magnetic microwave fields.
Article
Materials Science, Multidisciplinary
Kota Katsumi, Morihiko Nishida, Stefan Kaiser, Shigeki Miyasaka, Setsuko Tajima, Ryo Shimano
Summary: The recent observation of light-induced superconducting transient response in YBa2Cu3Oy (YBCO) has attracted attention in the field of high-Tc superconductors. The emergence of 1/ω-like behavior in the optical conductivity in the terahertz range is a prominent fingerprint of light-induced superconductivity. However, it can also be described by the Drude response of quasiparticles. To address this ambiguity, we investigated the light-induced nonequilibrium state in an underdoped YBCO sample using nonlinear THz optical response.
Article
Materials Science, Multidisciplinary
Alexander A. Tsirlin, Brenden R. Ortiz, Martin Dressel, Stephen D. Wilson, Stephan Winnerl, Ece Uykur
Summary: High-pressure single-crystal x-ray diffraction experiments show that the superconducting kagome metal CsV3Sb5 undergoes a transformation from hexagonal to monoclinic symmetry above 10 GPa under nonhydrostatic pressure conditions. This is different from its behavior under quasihydrostatic conditions in neon where it retains hexagonal symmetry up to at least 20 GPa. The monoclinic distortion mainly affects the honeycomb nets of Sb atoms, while the kagome planes remain almost unchanged. Ab initio density-functional calculations reveal that there are only minor changes in the electronic structure between the quasihydrostatic and nonhydrostatic cases. The reentrant behavior is likely caused by Fermi surface reconstruction driven by the formation of interlayer Sb-Sb bonds in both monoclinic and hexagonal CsV3Sb5 structures at high pressures.
Article
Materials Science, Multidisciplinary
R. Roesslhuber, R. Huebner, M. Dressel, A. Pustogow
Summary: We investigate the dielectric properties of the molecular quantum-spin-liquid candidate K-(BEDT-TTF)2 Ag2(CN)3 under varying frequency, pressure, and temperature. The transition from incoherent semiconducting to Mott-insulating state leads to a decrease in the low-frequency dielectric constant to small positive values (~10). The characteristic relaxor-type peak shifts to lower temperatures with increased pressure, and an additional feature appears near the percolative first-order transition. The pressure-dependent dielectric response is similar to the sister compound K-(BEDT-TTF)2Cu2(CN)3.
Article
Materials Science, Multidisciplinary
Yuk Tai Chan, Natanja Elliger, Berina Klis, Marton Kollar, Endre Horvath, Laszlo Forro, Martin Dressel, Ece Uykur
Summary: Hybrid organic-inorganic halide perovskites have potential as next-generation photovoltaic materials, but their structure stability and composition pose challenges. By using external pressure, ion migration can be suppressed and the structural transition can be enhanced and stabilized.
