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Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
We demonstrated coherent control of a quantum two-level system based on two-electron spin states in a double quantum dot, allowing state preparation, coherent manipulation, and projective readout.…
Scalable designs for quasiparticle-poisoning-protected topological quantum computation with Majorana zero modes
We present designs for scalable quantum computers composed of qubits encoded in aggregates of four or more Majorana zero modes, realized at the ends of topological superconducting wire segments that…
Electron Transport in Quantum Dots
The ongoing miniaturization of solid state devices often leads to the question: “How small can we make resistors, transistors, etc., without changing the way they work?” The question can be asked a…
Electrical Transport in Single-Wall Carbon Nanotubes
We review recent progress in the measurement and understanding of the electricalproperties of individual metal and semiconducting single-wall carbon nanotubes. Thefundamental scattering mechanisms…
Manipulation of a single charge in a double quantum dot.
It is shown that under resonant conditions, microwaves drive transitions between the (1,0) and (0,1) charge states of the double dot using microwave excitation results in a fully tunable double quantum dot.
Hot carrier transport and photocurrent response in graphene.
The impact of carrier multiplication on photocurrent response is enhanced by very inefficient electron cooling, resulting in an abundance of hot carriers and a fingerprint of hot-carrier-dominated transport and carrier multiplication.
Relaxation, dephasing, and quantum control of electron spins in double quantum dots
Recent experiments have demonstrated quantum manipulation of two-electron spin states in double quantum dots using electrically controlled exchange interactions. Here we present a detailed theory for…
Milestones toward Majorana-based quantum computing
We introduce a scheme for preparation, manipulation, and readout of Majorana zero modes in semiconducting wires with mesoscopic superconducting islands. Our approach synthesizes recent advances in…
Exponential protection of zero modes in Majorana islands
The results help to explain the trivial-to-topological transition in finite systems and to quantify the scaling of topological protection with end-mode separation.
Low-temperature fate of the 0.7 structure in a point contact: a Kondo-like correlated state in an open system.
Evidence is presented that the disappearance of the 0.7 structure at very low temperature signals the formation of a Kondo-like correlated spin state, including a zero-bias conductance peak that splits in a parallel field, scaling of conductance to a modified Kondo form, and consistency between peak width and the Kondo temperature.