A5007276603- Graphene research and applications
- Quantum and electron transport phenomena
- Topological Materials and Phenomena
- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Molecular Junctions and Nanostructures
- Noncommutative and Quantum Gravity Theories
- Advanced Materials and Mechanics
- Carbon Nanotubes in Composites
- Diamond and Carbon-based Materials Research
- Advanced Sensor and Energy Harvesting Materials
Universität Hamburg
2019-2024
In 2005, Kane and Mele [Phys. Rev. Lett. 95, 226801 (2005)PRLTAO0031-900710.1103/PhysRevLett.95.226801] predicted that at sufficiently low energy, graphene exhibits a topological state of matter with an energy gap generated by the atomic spin-orbit interaction. However, this intrinsic has not been measured to date. Letter, we exploit chirality low-energy states resolve gap. We probe spin experimentally employing temperature microwave excitation in resistively detected electron-spin resonance...
We investigate the sideband spectra of a driven nonlinear mode with its eigenfrequency being modulated at low frequency (<1 kHz). This additional parametric modulation leads to prominent antiresonance line shapes in spectra, which can be controlled through vibration state mode. also establish direct connection between and squeezing thermal fluctuation system. Our Letter not only provides simple robust method for characterization, but opens new possibility toward applications.
Integration of 2D materials in nanoelectromechanical systems (NEMS) marries the robustness silicon-based with exceptional electrical controllability materials, drastically enhancing system performance which now is key for many advanced applications nanotechnology. Here, we experimentally demonstrate and theoretically analyze a powerful on-chip graphene integrated NEMS device consisting hybrid graphene/silicon-nitride membrane metallic leads that enables an extremely large static dynamic...
The low-lying states of graphene contain exciting topological properties that depend on the interplay different symmetry-breaking terms. corresponding energy gaps remained unexplored until recently due to low-energy scale terms involved (few tens $\ensuremath{\mu}\mathrm{eV}$). These include sublattice splitting, Rashba coupling, and intrinsic spin-orbit whose balance determines properties. In this work, we unravel contributions arising from spin orbit splitting in hexagonal boron-nitride....
Field emission (FE), the process of emitting electrons from surface a metal under large perpendicular electric fields, has long history and plays crucial role in numerous applications ranging electron microscopes to detectors. A key determining factor for FE is work function material. Graphene semimetallic that can be tuned by position Fermi level, lending it distinct advantage applications. However, exceptional thinness graphene means its properties are highly dependent on environment...
The generation of non-equilibrium electron spin polarization, transport, and detection are fundamental in many quantum devices. We demonstrate that a lattice magnetic nanodots enhances the polarization monolayer graphene via carrier exchange. probed through resistively-detected variant resonance (ESR) observed amplification mediated by presence nanodots. Each nanodot locally injects surplus spin-polarized carriers into graphene, ensemble all "spin hot spots" generates layer at macroscopic...