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Materials Today Quantum
ISSN 2950-2578 · Elsevier · 59 artikel di indeks
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Artikel Jurnal
Field-free superconducting diode effect and topological Fulde-Ferrell superconductivity in altermagnetic Shiba chains
The superconducting diode effect (SDE), characterized by a directional asymmetry in the critical supercurrents, typically requires external magnetic fields to break time-reversal symmetry—posing challenges for scalability and device integration. Here, we demonstrate a field-free realization of the…
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Quantum geometry driven finite-momentum exciton fluctuations in flat-band systems
Quantum geometry is instrumental in stabilizing exotic phenomena in systems ranging from topological insulators to superconductors. In dispersionless flat bands, where the kinetic energy is quenched, the quantum metric emerges as the fundamental driver of macroscopic collective phenomena. Here, we…
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Towards a defect-resistant design of quantum materials
Defect engineering is a vital tool for modulating the physical and electronic properties of strongly correlated materials, yet the dual impact of microscopic electronic disorder and macroscopic structural degradation remains poorly understood. In this work, we present a multi-scale modeling…
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Quantum correlation and synchronisation-enhanced energy transfer in driven-dissipative light-harvesting dimers
Quantum synchronisation has recently been proposed as a mechanism for electronic excitation energy transfer in light-harvesting complexes, yet its robustness in driven-dissipative settings remains under active investigation. Here, we revisit this mechanism in cryptophyte photosynthetic antennae…
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Molecular insights into balanced hole and electron transport in urea-modified fluorene for OLED applications
The optoelectronic and charge-transport characteristics of fluorene (F) and its urea derivative, N-(9H-fluoren-9-yl) urea (9FU), are investigated in this work using DFT and TD-DFT. Electronic excitations, charge extraction parameters, ionisation potentials, electron affinities, and reorganisation…
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RinQ: Towards predicting central sites in proteins on current quantum computers
We introduce RinQ, a hybrid quantum–classical framework for identifying functionally critical residues in proteins by formulating centrality detection as a Quadratic Unconstrained Binary Optimization (QUBO) problem. Protein structures are modeled as residue interaction networks (RINs), and the QUBO…
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Improved thermoelectric performance in Cr-doped two-dimensional Bi2Te3
Thermoelectric materials with high electrical conductivity and low thermal conductivity (e.g., Bi2Te3) can efficiently convert waste heat into electricity. However, despite favorable theoretical predictions, individual Bi2Te3 nanostructures such as two-dimensional (2D) nanoplates tend to…
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Hexagonal supertetrahedral gallium: a cluster-based three-dimensional topological metal
Two novel three-dimensional allotropes, designated as hexagonal supertetrahedral aluminum and gallium (h-Al/h-Ga), are proposed based on a hexagonal diamond structure and share the same space group symmetry (P63/mmc) as hexagonal diamond. First-principles calculations demonstrate their structural…
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Manifestation of critical effects in environmental parameter estimation using a quantum sensor under dynamical control
Quantum probes offer a powerful platform for exploring environmental dynamics, particularly through their sensitivity to decoherence processes. In this work, we investigate the emergence of critical behavior in the estimation of the environmental memory time τc, modeled as an Ornstein–Uhlenbeck…
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Tailoring electronic, optical, and reactive properties of Br- and F-doped graphene nanoflakes: A DFT-based study
The present study utilizes density functional theory (DFT) to methodically examine the geometric, electrical, and chemical characteristics of both pure and halogen doped graphene nanoflakes (GNFs). Geometric optimization indicates that the incorporation of bromine and fluorine atoms results in…
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Investigation of structural and external parameters affecting the efficiency of quantum dot solar cells: A modified detailed-balance model study
In this study, the power conversion efficiency (PCE) of InP/GaAs/GaSb quantum dot solar cell (QDSC) with type II confinement regime is investigated depending on different structural parameters such as, core radius, spacer layer, and outer shell thickness using both original detailed balance model…
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Optimizing lossy state preparation for quantum sensing using Hamiltonian engineering
One of the most prominent platforms for demonstrating quantum sensing below the standard quantum limit is the spinor Bose–Einstein condensate. While a quantum advantage using several tens of thousands of atoms has been demonstrated in this platform, it faces an important challenge: atom loss. Atom…
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Driven Majorana modes: A route to synthetic px+ipy superconductivity
We propose a protocol to realize synthetic px+ipy superconductors in one-dimensional topological systems that host Majorana fermions. By periodically driving a localized Majorana mode across the system, our protocol realizes a topological pumping of Majorana fermions, analogous to the adiabatic…
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Diagnosis of enforced phonon band crossings in the entire frequency window by compatibility relations
Topological band crossings (BCs) such as Dirac and Weyl points can provide intriguing physical properties in both fermionic systems and bosonic systems, like surface Fermi arcs, chiral anomaly, spin-momentum locking, and among others. Unlike BCs at high-symmetry points (HSPs) formed by a single…
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Interface controlled Berry phase and anisotropic spin–charge conversion in altermagnet–topological insulator bilayers
We propose an altermagnet–topological insulator bilayer as a platform to engineer Berry phase driven spin–charge responses using an interfacial buffer layer. Using a momentum-space lattice model and linear-response theory, we investigate a d-wave altermagnet coupled to a topological insulator and…
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Nodal-line semimetals and their variance
Topological nodal-line semimetals (NLSMs) are a new family of topological materials characterized by electronic band crossings that form lines in the Brillouin zone. These NLSMs host exotic nodal-line structures and exhibit distinct features such as drumhead surface states and unique…
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Projective crystal symmetry and topological phases
Quantum states naturally represent symmetry groups, though often in a projective sense. Intriguingly, the projective nature of crystalline symmetries has remained underexplored until very recently. A series of groundbreaking theoretical and experimental studies have now brought this to light…
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Thermoelectric quantum oscillations and Zeeman splitting in topological Dirac semimetal BaAl4
Three-dimensional topological semimetals hosting Dirac or Weyl fermions are a new kind of materials class in which conduction and valence bands cross each other. Such materials harbor a nontrivial Berry phase, which is an additional geometrical phase factor arising along the path of an adiabatic…
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Nonlinear bulk photocurrent probe Z2 topological phase transition in noncentrosymmetric materials
Detecting topological phase transitions in bulk is challenging due to the limitations of surface-sensitive probes like ARPES. Here, we demonstrate that nonlinear bulk photocurrents, specifically shift and injection currents, serve as effective probes of Z2 topological transitions in…
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Quantum metric nonlinear spin-orbit torque enhanced by topological bands
Effects manifesting quantum geometry have been a focus of physics research. Here, we reveal that quantum metric plays a crucial role in nonlinear electric spin response, leading to a quantum metric spin–orbit torque. We argue that enhanced quantum metric can occur at band (anti)crossings, so the…