A5085808471- Quantum and electron transport phenomena
- Semiconductor Quantum Structures and Devices
- Electronic and Structural Properties of Oxides
- Advancements in Semiconductor Devices and Circuit Design
- Diamond and Carbon-based Materials Research
- Quantum Information and Cryptography
- Magnetic properties of thin films
- Magnetic Field Sensors Techniques
- Atomic and Subatomic Physics Research
- Semiconductor materials and devices
- Characterization and Applications of Magnetic Nanoparticles
- Advanced Materials Characterization Techniques
- Quantum Mechanics and Applications
- Topological Materials and Phenomena
- Magnetic Properties and Applications
- Magnetic Properties of Alloys
- Magnetic and transport properties of perovskites and related materials
- Quantum, superfluid, helium dynamics
- Quantum Dots Synthesis And Properties
- Integrated Circuits and Semiconductor Failure Analysis
- Quantum-Dot Cellular Automata
- Magneto-Optical Properties and Applications
- Electron and X-Ray Spectroscopy Techniques
- Semiconductor Lasers and Optical Devices
- Music and Audio Processing
Harvard University
2014-2021
Princeton University
2011-2013
Abstract Magnetic skyrmions are two-dimensional non-collinear spin textures characterized by an integer topological number. Room-temperature were recently found in magnetic multilayer stacks, where their stability was largely attributed to the interfacial Dzyaloshinskii–Moriya interaction. The strength of this interaction and its role stabilizing is not yet well understood, imaging full structure needed address question. Here, we use a nitrogen-vacancy centre diamond measure map fields...
We perform Landau-Zener-Stuckelberg interferometry on a single electron GaAs charge qubit by repeatedly driving the system through an avoided crossing. observe coherent destruction of tunneling, where periodic with specific amplitudes inhibits current flow. probe quantum dot occupation using sensor, observing oscillations in population resulting from microwave driving. At frequency 9 GHz we excitation processes driven absorption up to 17 photons. Simulations occupancy are good agreement...
We measure the interdot charge relaxation time ${T}_{1}$ of a single electron trapped in an accumulation mode $\mathrm{Si}/\mathrm{SiGe}$ double quantum dot. The energy level structure qubit is determined using photon assisted tunneling, which reveals presence low-lying excited state. systematically as function detuning and tunnel coupling show that it tunable over four orders magnitude, with maximum $45\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$ for our device configuration.
We demonstrate multipulse quantum control of a single electron charge qubit. The qubit is manipulated by applying nonadiabatic voltage pulses to surface depletion gate and readout achieved using point contact sensor. observe Ramsey fringes in the excited state occupation response pi/2 - pulse sequence extract T2* ~ 60 ps away from degeneracy point. Simulations suggest these results may be extended implement charge-echo reducing interdot tunnel coupling rise time, thereby increasing...
We perform quantum Hall measurements on three types of commercially available modulation-doped Si/SiGe heterostructures to determine their suitability for depletion gate defined dot devices. By adjusting the growth parameters, we are able achieve electron gases with charge densities 1–3 × 1011/cm2 and mobilities in excess 100 000 cm2/Vs. Double devices fabricated these show clear evidence single transitions as measured dc transport sensing exhibit temperatures mK regime.
Magnetic skyrmions are two-dimensional non-collinear spin textures characterised by an integer topological number. They commonly crystallise at low temperatures in bulk noncentrosymmetric ferromagnets where the lack of inversion symmetry leads to antisymmetric component exchange interaction. Recently, stable room-temperature were reported stacks thin magnetic films results from broken interface. Determining structure these technologically-relevant presence external fields has remained a key...