Article
Physics, Fluids & Plasmas
Jack A. Logan, Alexei Tkachenko
Summary: This paper presents a statistical mechanical description of randomly packed spherical particles, calculating the overall packing entropy based on the statistical weights and topologically distinct states. The theory generalizes concepts of granular and glassy configurational entropies and is applicable to nonjammed systems and sticky colloids.
Article
Physics, Multidisciplinary
Giandomenico Palumbo
Summary: This study introduces and applies non-Abelian tensor Berry connections to topological phases in multiband systems, providing a new theoretical framework to understand the emergence of non-Abelian gauge fields in condensed matter physics. By constructing these novel gauge fields, the research sheds new light on the search for novel topological phases in solid-state and synthetic systems, offering a unified framework for different multiband topological systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Xinxin Zhao, Yiming Mi
Summary: Cu2Te is commonly used as the backside contact of CdTe-based solar cells. We predict a stable topological semimetal structure of Cu2Te(R3m) with triply degenerate nodal points near the Fermi energy. Compounds X2Y (X = Cu, Ag, Au, Y = O, S, Se, Te) except for Au2S and Cu2O are topological semimetals with triply degenerate nodal points around the Fermi energy.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
Seung-Gyo Jeong, Sang-Hoon Han, Tae-Hwan Kim, Sangmo Cheon
Summary: In this study, the authors investigate hidden chiral domain wall states and their topological properties in a double-chain Su-Schrieffer-Heeger model and elucidate a series of single and double gap phases that occur by varying the dimerization and interchain coupling.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoming Zhang, Huidong Wang, Jiale Liu, Mingwen Zhao, Feng Liu
Summary: Researchers propose that line defects of chalcogen vacancies embedded in stoichiometric transition metal dichalcogenides can be a candidate for achieving stable Majorana zero modes (MZMs) without the need for topological surface states. Their study shows that noncentrosymmetric point group symmetry ensures the effect of antisymmetric spin-orbit coupling, which is the origin of odd-parity pairing.
Article
Materials Science, Multidisciplinary
Xuliang Chen, Shuyang Wang, Jing Wang, Chao An, Ying Zhou, Zheng Chen, Xiangde Zhu, Yonghui Zhou, Zhaorong Yang, Mingliang Tian
Summary: The Zint-phase EuCd2As2 exhibits various ideal topological states under external parameters and has been studied extensively. In this study, high-quality EuCd2As2 single crystals were measured under high pressures using resistance, magnetization, Hall effect, and synchrotron x-ray diffraction techniques. An intrinsically insulating antiferromagnetic ground state was discovered, with the antiferromagnetic transition temperature increasing linearly with pressure. At higher pressures, a ferromagnetic-like metallic state appeared due to a structural transition. A temperature-pressure phase diagram was constructed based on the experimental data, providing important insights into the pressure-dependent behaviors of magnetism and transport properties.
Article
Materials Science, Multidisciplinary
Takeshi Mizushima, Shun Tamura, Keiji Yada, Yukio Tanaka
Summary: We investigate emergent odd-frequency pairs and proximity effect in superconducting topological insulators (STIs) and find the evolution and spin polarization of these pairings can be captured by tunnel conductance spectroscopy. Furthermore, we study the anomalous proximity effect in different irreducible representations of STIs and demonstrate that it is not immune to nonmagnetic impurities due to the admixture of s-wave and non-s-wave pairs caused by strong spin-orbit interaction inherent to the parent materials.
Article
Chemistry, Multidisciplinary
Joan Sendra, Fabian Haake, Micha Calvo, Henning Galinski, Ralph Spolenak
Summary: Strain-engineering of materials leads to optical anisotropy, but the current capability to image and map local strain fields is limited. This study introduces a phase-sensitive multi-material optical platform, a broadband scanning reflectance anisotropy microscope, for strain mapping. The microscope produces hyperspectral images with high resolution and demonstrates cutting edge strain sensitivity. It opens up the possibility for non-destructive mechanical characterization of multi-material components.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Nuclear
D. Mroczek, M. Hjorth-Jensen, J. Noronha-Hostler, P. Parotto, C. Ratti, R. Vilalta
Summary: The Beam Energy Scan Theory (BEST) collaboration incorporates a three-dimensional Ising model critical point into the quantum chromodynamics (QCD) equation of state from lattice simulations. However, there are four free parameters related to the size and location of the critical region in the QCD phase diagram. Certain combinations of these parameters can lead to acausal or unstable realizations of the equation of state. This work presents an active learning framework to efficiently identify and rule out such pathological equation of state.
Article
Chemistry, Multidisciplinary
Tiema Qian, Eve Emmanouilidou, Chaowei Hu, Jazmine C. Green, Igor I. Mazin, Ni Ni
Summary: This study demonstrates the multiple metamagnetic transitions induced by external pressure in topological van der Waals magnets, providing a new avenue for efficient magnetic manipulation in these materials.
Article
Materials Science, Multidisciplinary
Chun -Chi Liu, Liu-Hao Li, Jin An
Summary: Topology is crucial in non-Hermitian systems, but characterizing non-Hermitian topological systems under open-boundary conditions is challenging. A recent study found that a one-dimensional topological invariant defined on a generalized Brillion zone can describe the topological property of a specific model. However, for a 1D multiband chiral symmetric system, defining the topological invariant is still controversial. Our work provides exact proof and demonstration that a more generalized closed loop should replace the generalized Brillion zone for acquiring the topological invariant in multiband non-Hermitian models with chiral symmetry, establishing the non-Bloch bulk-boundary correspondence.
Article
Materials Science, Multidisciplinary
Xin Yue, Guo-Jian Qiao, C. P. Sun
Summary: The study reveals that the physical simulation of the Majorana fermion in the edge state of the topological insulator coupled to a superconductor system is not valid for a larger surface gap. By considering the dependence of pairing strength on the surface gap, a refined pairing term is obtained and a significant difference in the Majorana phase diagram is observed compared to previous work.
Article
Optics
Qingxi Xu, Yuchen Peng, Bei Yan, Aoqian Shi, Peng Peng, Jianlan Xie, Jianjun Liu
Summary: This Letter proposes a triangular photonic crystal structure based on a 12-fold Penrose-type photonic quasicrystal, where the topological edge state (TES) and topological corner state (TCS) can be generated in both low- and high-frequency bands. The structure also allows for the realization of three groups of TCSs, providing a new way to improve the performance and integration of topological photonic devices.
Article
Astronomy & Astrophysics
Michael Thies
Summary: This paper reconsiders the two-flavor version of the massive chiral Gross-Neveu model in 1+1 dimensions and explores its phase diagram. By adding the missing tricritical curves and using fourth-order almost degenerate perturbation theory, the parameter range of the phase diagram is accurately determined.
Article
Multidisciplinary Sciences
Rajesh K. Malla, Wilton J. M. Kort-Kamp
Summary: We investigate the dynamics of spin-orbit coupled graphene family materials to unveil topological phase transition fingerprints embedded in the nonlinear regime. Our findings show how these signatures manifest in the nonlinear Kerr effect and in third-harmonic generation processes, shedding light on the unique processes involved in harmonic generation via topological phenomena.
SCIENTIFIC REPORTS
(2021)
Meeting Abstract
Oncology
Juan Cristobal Sanchez, Beatriz Nunez Garcia, Alberto Ruano, Mariola Blanco, Blanca Cantos Sanchez de Ibarguren, Miriam Mendez, Arturo Jose Ramos-Vegue, Ana Maria Morito, Ramon Aguado, Mariano Provencio-Pulla
JOURNAL OF CLINICAL ONCOLOGY
(2021)
Article
Multidisciplinary Sciences
Marco Valentini, Fernando Penaranda, Andrea Hofmann, Matthias Brauns, Robert Hauschild, Peter Krogstrup, Pablo San-Jose, Elsa Prada, Ramon Aguado, Georgic Katsaros
Summary: The presence of subgap states in a semiconducting nanowire fully wrapped by a superconducting shell is influenced by the junction region in tunneling spectroscopy measurements, rather than the nanowire itself. Quantum dots formed in the junction region may host Andreev levels in the Yu-Shiba-Rusinov regime, leading to intricate magnetic field dependence of the Andreev levels. This could result in zero-bias peaks that are easily misinterpreted as originating from Majorana zero modes, but are actually unrelated to topological superconductivity.
Meeting Abstract
Oncology
F. F. Franco, Y. Garitaonaindia, M. Blanco Clemente, M. Torrente, V. Calvo de Juan, A. Collazo Lorduy, L. Gutierrez, J. C. Sanchez, M. A. Gonzalez del Alba Baamonde, A. Royuela, G. Visedo, S. C. Gonzalez, M. Martinez Cutillas, C. Traseira Puchol, R. Aguado, C. D. Mitroi, M. Provencio
ANNALS OF ONCOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Samuel D. Escribano, Andrea Maiani, Martin Leijnse, Karsten Flensberg, Yuval Oreg, Alfredo Levy Yeyati, Elsa Prada, Ruben Seoane Souto
Summary: This study analyzes a tripartite semiconductor/ferromagnetic-insulator/superconductor heterostructure and finds that it can be tuned into the topological regime within a certain range. The system displays regular alternations between trivial and topological phases, with a large topological gap thanks to vertical confinement.
NPJ QUANTUM MATERIALS
(2022)
Article
Multidisciplinary Sciences
Marco Valentini, Maksim Borovkov, Elsa Prada, Sara Marti-Sanchez, Marc Botifoll, Andrea Hofmann, Jordi Arbiol, Ramon Aguado, Pablo San-Jose, Georgios Katsaros
Summary: Hybrid semiconductor-superconductor devices have great potential for realizing topological quantum computing with Majorana zero modes. However, the detection of Majorana modes based on either tunnelling or Coulomb blockade spectroscopy is still disputable. In this study, we propose an experimental protocol that allows us to perform both types of measurement on the same hybrid island, effectively reducing ambiguities in Majorana detections.
Article
Physics, Multidisciplinary
Marta Pita-Vidal, Arno Bargerbos, Rok Zitko, Lukas J. Splitthoff, Lukas Grunhaupt, Jaap J. Wesdorp, Yu Liu, Leo P. Kouwenhoven, Ramon Aguado, Bernard van Heck, Angela Kou, Christian Kraglund Andersen
Summary: Spin qubits in semiconductors are a promising platform for scalable quantum computing devices, but achieving multiqubit interactions over extended distances is challenging. Superconducting spin qubits encoded in Andreev levels provide an alternative with intrinsic spin-supercurrent coupling. This study demonstrates an electrostatically defined quantum dot Josephson junction with a spin-split doublet ground state, allowing for qubit manipulation and investigating the qubit performance using direct spin manipulation. Coupling the Andreev spin qubit with a superconducting transmon qubit shows strong coherent qubit-qubit coupling, a crucial step towards a hybrid architecture combining the advantages of both superconducting and semiconductor qubits.
Article
Physics, Multidisciplinary
Arno Bargerbos, Marta Pita-Vidal, Rok Zitko, Lukas J. Splitthoff, Lukas Grunhaupt, Jaap J. Wesdorp, Yu Liu, Leo P. Kouwenhoven, Ramon Aguado, Christian Kraglund Andersen, Angela Kou, Bernard van Heck
Summary: We performed spectroscopy of a quantum dot Josephson junction using a hybrid superconductor-semiconductor transmon device. The spin-orbit coupling in the device allowed us to observe two flux-sensitive branches in the transmon spectrum. A finite magnetic field caused a shift in the energy of the branches, favoring one spin state and resulting in the anomalous Josephson effect. We successfully demonstrated the excitation of the direct spin-flip transition using all-electrical control, which could enable the future implementation of charging energy protected Andreev spin qubits.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Pablo San-Jose, Carlos Paya, C. M. Marcus, S. Vaitiekenas, Elsa Prada
Summary: Full-shell nanowires are hybrid nanostructures with a semiconducting core and a superconducting shell. We theoretically show that these nanowires can exhibit CdGM analogs, which are subgap states induced by the shell. The skewness of the CdGM analogs inside nonzero LP lobes can be used to extract microscopic information.
Article
Quantum Science & Technology
Arno Bargerbos, Marta Pita-Vidal, Rok Zitko, Jesus Avila, Lukas J. Splitthoff, Lukas Grunhaupt, Jaap J. Wesdorp, Christian K. Andersen, Yu Liu, Leo P. Kouwenhoven, Ramon Aguado, Angela Kou, Bernard van Heck
Summary: We realize a hybrid superconductor-semiconductor transmon device where the Josephson effect is controlled by a gate-defined quantum dot in an InAs-Al nanowire. By performing microwave spectroscopy of the transition spectrum, we are able to probe the ground-state parity of the quantum dot as a function of gate voltages, external magnetic flux, and magnetic field applied parallel to the nanowire. Our results are in agreement with theoretical predictions and provide insights into the dynamics of the quantum dot Josephson junction.
Article
Materials Science, Multidisciplinary
Samuel D. Escribano, Alfredo Levy Yeyati, Ramon Aguado, Elsa Prada, Pablo San-Jose
Summary: This article analyzes the subgap excitations and phase diagram of a quantum dot coupled to a semiconducting nanowire fully wrapped by a superconducting shell. It finds that the induced pairing vanishes under shell fluxoids, causing a level renormalization and pushing subgap levels closer to zero energy.
