All-electric single-electron spin-to-charge conversion

Abstract

We examine spin-dependent displacement of a single electron, resulting in separation and relocation of the electron wavefunction components, and thus charge parts, corresponding to opposite spins. This separation is induced by a pulse of an electric field which generates varying Rashba type spin-orbit coupling. This mechanism is next implemented in a nanodevice based on a gated quantum dot defined within a quantum nanowire. The electric field pulse is generated by ultrafast changes of voltages, of the order of several hundred mV, applied to nearby gates. The device is modeled realistically with appropriate material parameters and voltages applied to the gates, yielding an accurate confinement potential and Rashba coupling. At the end, we propose a spin-to-charge conversion device, which with an additional charge detector will allow for electron spin state measurement.

Thermal effects on a nonadiabatic spin-flip protocol of spin-orbit qubits

“…Electron-spin qubits are promising candidates as building blocks of quantum computers. They can be realized in gated semiconductor devices based on quantum dots and quantum wires [1,2], and their state can be manipulated via magnetic fields [3,4] or the spin-orbit interaction, which is easily controlled with electrostatic gates [5][6][7][8][9][10][11][12][13][14][15][16]. Such systems were already experimentally realized in various semiconducting devices [17][18][19][20][21].…”

Thermal effects on a nonadiabatic spin-flip protocol of spin-orbit qubits

“…Electron-spin qubits are promising candidates as building blocks of quantum computers. They can be realized in gated semiconductor devices based on quantum dots and quantum wires 1,2 and their state can be manipulated via magnetic fields 3,4 or the spin-orbit interaction, which is easily controlled with electrostatic gates [5][6][7][8][9][10][11][12][13][14][15][16] . Such systems were already experimentally realized in various semiconducting devices [17][18][19][20][21] .…”