A5101514416- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Semiconductor Quantum Structures and Devices
- Surface and Thin Film Phenomena
- Graphene research and applications
- Nanowire Synthesis and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Electronic and Structural Properties of Oxides
- Tendon Structure and Treatment
- Quantum Information and Cryptography
- Advanced Research in Systems and Signal Processing
- Geotechnical and Geomechanical Engineering
- Advanced Electron Microscopy Techniques and Applications
- Gyrotron and Vacuum Electronics Research
- Immune cells in cancer
- Quantum-Dot Cellular Automata
- Pomegranate: compositions and health benefits
- Catalysis and Hydrodesulfurization Studies
- Cellular transport and secretion
- 2D Materials and Applications
- Knee injuries and reconstruction techniques
- Laser Applications in Dentistry and Medicine
- Graphene and Nanomaterials Applications
- Integrated Circuits and Semiconductor Failure Analysis
University of Pittsburgh
2011-2025
Beijing Academy of Quantum Information Sciences
2024
Nanjing Medical University
2024
Xuzhou Medical College
2024
Qingdao University
2024
University of Pittsburgh Medical Center
2024
UPMC Hillman Cancer Center
2024
Qingdao Municipal Hospital
2024
Huazhong University of Science and Technology
2022
Tongji Hospital
2022
Move aside, aluminum Some of the most promising schemes for quantum information processing involve superconductors. In addition to established superconducting qubits, topological qubits may one day be realized in semiconductor-superconductor heterostructures. The superconductor widely used this context is aluminum, which processes that cause decoherence are suppressed. Pendharkar et al. go beyond paradigm show tin can place (see Perspective by Fatemi and Devoret). authors grew nanowires...
Rationale: In the glioblastoma (GBM) microenvironment, tumor-associated macrophages (TAMs) are prominent components and facilitate tumor growth. The exact molecular mechanisms underlying TAMs' function in promoting glioma stem cells (GSCs) maintenance growth remain largely unknown. We found a candidate molecule, transforming factor beta-induced (TGFBI), that was specifically expressed by TAMs extremely low GBM GSC cells, meanwhile closely related to WHO grades patient prognosis. mechanism of...
Myotendinous junction (MTJ) injuries are prevalent in clinical practice, yet the treatment approaches limited to surgical suturing and conservative therapy, exhibiting a high recurrence rate. Current research on MTJ tissue engineering is scarce lacks vivo evaluation of repair efficacy. Here, we developed three-dimensional-printed bioactive fiber-reinforced hydrogel containing mesenchymal stem cells (MSCs) Klotho for structural functional regeneration. In rat defect model, promoted...
We investigate the current-phase relations of Al/InAs-quantum well planar Josephson junctions fabricated using nanowire shadowing technique. Based on several experiments, we conclude that exhibit an unusually large second-order harmonic, $\sin(2\varphi)$ term. First, superconducting quantum interference devices (dc-SQUIDs) show half-periodic oscillations, tunable by gate voltages as magnetic flux. Second, junction kinks near half-flux in supercurrent diffraction patterns. Third, half-integer...
We study Josephson junctions based on InSb nanowires with Sn shells. observe skewed critical current diffraction patterns: the maxima in forward and reverse bias are at different magnetic flux, a displacement of 20-40 mT. The skew is greatest when external field nearly perpendicular to nanowire, substrate plane. This orientation suggests that spin-orbit interaction plays role. develop phenomenological model perform tight-binding calculations, both methods reproducing essential features...
Abstract Superconducting diodes, characterized by the nonreciprocal supercurrent flow, have gained significant attention for their potential in dissipationless electronics. This study presents a superconducting quantum interference device (SQUID) composed of two Al-InSb nanosheet Josephson junctions. Utilizing prepatterned local backgates, we achieve gate- and flux-tunable diode with controllable efficiency both amplitude sign. Numerical simulations attribute effect to higher harmonics...
Summary Focused ion beam milling at cryogenic temperatures (cryo‐FIB) is a valuable tool that can be used to thin vitreous biological specimens for subsequent imaging and analysis by cryo‐transmission electron microscopy (cryo‐TEM) in frozen‐hydrated state. This technique offers the potential benefit of eliminating mechanical artefacts are typically found with cryo‐ultramicrotomy. However, due additional complexity transferring samples out FIB, contamination devitrification amorphous ice...
We investigate an electron transport blockade regime in which a spin triplet localized the path of current is forbidden from entering spin-singlet superconductor. To stabilize triplet, double quantum dot created electrostatically near superconducting Al lead InAs nanowire. The closest to normal exhibits Coulomb diamonds, and Andreev bound states induced gap. experimental observations compare favorably theoretical model blockade, named so because configuration suppresses reflections. Observed...
We study Josephson junctions based on InSb nanowires with Sn shells. observe skewed critical current diffraction patterns: the maxima in forward and reverse bias are at different magnetic flux, a displacement of 20-40 mT. The skew is greatest when external field nearly perpendicular to nanowire, substrate plane. This orientation suggests that spin-orbit interaction plays role. develop phenomenological model perform tight-binding calculations, both methods reproducing essential features...
Under certain symmetry-breaking conditions, a superconducting system exhibits asymmetric critical currents, dubbed the ``superconducting diode effect.'' Recently, systems with ideal efficiency or unidirectional superconductivity have received considerable interest. In this work, we report study of Al-InAs nanowire-Al Josephson junctions under microwave irradiation and magnetic fields. We observe an enhancement effect driving, featured by horizontal offset zero-voltage step in voltage-current...
Superconductor-semiconductor nanowire hybrid structures are useful in fabricating devices for quantum information processing. While selective area growth (SAG) offers the flexibility to grow semiconductor nanowires arbitrary geometries, situ evaporation of superconductors ensures pristine superconductor-semiconductor interfaces, resulting strong induced superconductivity semiconducting nanowire. In this work, we used high-aspect-ratio SiOx dielectric walls evaporate islands superconductor...
Topological superconductivity is expected to spur Majorana zero modes -- exotic states that are also considered a quantum technology asset. Fractional Josephson effect their manifestation in electronic transport measurements, often under microwave irradiation. A fraction of induced resonances, known as Shapiro steps, should vanish, pattern signifies the presence modes. Here we report patterns steps topological junctions, such missing first step, or several odd-order steps. But our which InAs...
Abstract Bone defects arising from trauma and tumors present a potential risk of infection compromise host immune function. Within dysfunctional microenvironment, the uncontrolled breeding bacteria persistent chronic inflammation exacerbate bone loss, impeding regeneration repair. Macrophages function as specialized phagocytes within microenvironment orchestrated role distinct phenotypes during has attracted significant attention. The M1 phenotype exhibits antimicrobial activities to...
Self-renewal of glioma stem cells (GSCs) is responsible for glioblastoma (GBM) therapy resistance and recurrence. Tumor necrosis factor α (TNFα) TNF signaling pathway display an antitumor activity in preclinical models tumor patients. However, TNFα exhibits no significance clinical prognosis based on the Glioma Genome Atlas database. This study aimed to explore whether microenvironment maintains self-renewal GSCs promotes worse
Quantum dots are gate-defined within InSb nanowires, in proximity to NbTiN superconducting contacts. As the coupling between dot and superconductor is increased, odd-parity occupation regions transport become nondiscernible (erased) both above below induced gap. Above gap, conductance odd Coulomb-blockade valleys increases until lifted. Below Andreev bound states undergo quantum phase transitions Kondo-screened singlet ground at occupancy. We investigate what degree apparent erasure of...
More and more materials, with a growing variety of properties, are built into electronic devices. This is motivated both by increased device performance the studies materials themselves. An important type Josephson junction based on proximity effect between quantum material superconductor, useful for fundamental research as well other technologies. When contacts placed same surface, such two-dimensional material, called ``planar". One outstanding challenge that not all amenable to standard...
Motivated by the recent proposal Potter et al. [Phys. Rev. X 6, 031026 (2016)] concerning possible thermoelectric signatures of Dirac composite fermions, we perform a systematic experimental study transport an ultrahigh-mobility $\mathrm{GaAs}/\mathrm{A}{\mathrm{l}}_{x}\mathrm{G}{\mathrm{a}}_{1\text{\ensuremath{-}}x}\mathrm{As}$ two-dimensional electron system at filling factor $v=1/2$. We demonstrate that thermopower ${S}_{xx}$ and Nernst ${S}_{xy}$ are symmetric antisymmetric with respect...
Emerging opportunities combining acoustic non-destructive evaluation, optical fiber sensing, and AI are discussed for infrastructure monitoring spanning electrical grid, oil gas (CH 4 , H 2 CO ) pipelines, recovery, civil (roads, bridges, water).
Exploring the topology of electronic bands is a way to realize new states matter with possible implications for information technology. Because cannot always be observed directly, central question how tell that topological regime has been achieved. Experiments are often guided by prediction unique signal or pattern, called "the smoking gun". Examples include peaks in conductivity, microwave resonances, and shifts interference fringes. However, many condensed experiments performed on...
The absence of odd-order Shapiro steps is one the predicted signatures for topological superconductors. Experimentally, missing first-order step has been reported in several superconducting systems presumably to be topologically non-trivial, as well trivial regime superconductor-semiconductor Josephson junctions. In this work, we revisit first signature Al-InSb nanosheet junctions under microwave irradiation. found accompanied by a sharp voltage jump during switching and reappears when...
Under certain symmetry-breaking conditions, a superconducting system exhibits asymmetric critical currents, dubbed the ``superconducting diode effect" (SDE). Recently, systems with ideal efficiency or unidirectional superconductivity (USC) have received considerable interest. In this work, we report study of Al-InAs nanowire-Al Josephson junctions under microwave irradiation and magnetic fields. We observe an enhancement SDE driving, featured by horizontal offset zero-voltage step in...
Quantum point contacts made in a strained Ge/SiGe heterostructure show ballistic charge transport characteristics, featuring quantized conductance plateaus and magnetic field-induced Zeeman splitting of the subbands.
We report an experimental study of quantum point contacts defined in a high-quality strained germanium well with layered electric gates. At zero magnetic field, we observe quantized conductance plateaus units 2$e^2/h$. Bias-spectroscopy measurements reveal that the energy spacing between successive one-dimensional subbands ranges from 1.5 to 5\,meV as consequence small effective mass holes and narrow gate constrictions. finite fields perpendicular device plane, edges get splitted due Zeeman...