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HomeAuthorsAkis R.

Authors: Akis R.

Spin Density Functional Theory Simulations of Quantum Point Contacts: An Investigation of Spin Filtering Effects

Akis R., Ferry D.K., Arizona State University, US
We present simulations of quantum wires and quantum point contacts (QPCs) formed in semiconductor heterostructures. Conductance measurements for such structures is quantized with plateaus at integer multiples of G_0= (2e^2/h) as function of gate voltage, [...]

Implementation of Separable Scattering Mechanisms in Three-Dimensional Quantum Mechanical Simulations of a Silicon Quantum Wire

Gilbert M.J., Akis R., Ferry D.K., Arizona State University, US
In order to understand the operation of any type of semiconductor device, one must consider the effects of scattering. For many years, Monte Carlo has been the workhorse that has yielded great insight into the [...]

Spin Polarization in GaAs/Al0.24Ga0.76As Heterostructures

Ashok A., Akis R., Vasileska D., Ferry D.K., Arizona State University, US
Spintronics is a new branch of electronics which involves the active control and manipulation of spin degrees of freedom in solid-state devices. Spin transport differs from charge transport as spin is a non-conserved quantity in [...]

Modeling of Nanoelectronic and Quantum Devices

Ferry D.K., Akis R., Gilbert M.J., Speyer G., Arizona State University, US
The semiconductor industry is constantly pushing towards ever smaller devices and it is expected that we will see commercial devices with gate lengths less than 10 nm within the next decade. Such small devices have [...]

A Quantum Waveguide Array Generator For Performing Fourier Transforms

Akis R., Ferry D.K., Arizona State University, US
Recently, quantum computing has gained attention as a possible means of greatly increasing the speed of certain calculations when compared with traditional, binary computing. A key part of many quantum computing algorithms is the performance [...]

Initial State Preparation and Stability in Narrow Band-Gap Semiconductor Qubits

Gilbert M.J., Akis R., Ferry D.K., Arizona State University, US
The output of a quantum computing system depends on the quality of the preparation of the initial state of the qubit or qubits to be used in the subsequent computations. Here, we have defined a [...]

Gain in a Semiconductor Waveguide Qubit

Harris J., Akis R., Ferry D.K., Arizona State University, US
Recently, it has been suggested that it may be possible to use combinations of coupled quantum wire waveguides to form quantum computational qubits [1],[2]. However, there are several related problems intrinsic to this approach. First, [...]

Quantum Effects in SOI Devices

Ahmed S.S., Akis R., Vasileska D., Arizona State University, US
Quantum effects have been reported to play an important role in the operation of narrow width SOI devices, in which the carriers experience a two dimensional confinement in a square quantum well at the semiconductor-oxide [...]

Self-consistent Modeling of Open Quantum Devices

Akis R., Shifren L., Ferry D.K., Arizona State University, US
In this paper, we describe a method of simulating electron transport in semiconductor devices that operate in the quantum regime. Specifically, devices formed in which the electrons are confined to two dimensions (2D) and transport [...]

The Role of the Quantization Effects on the Operation of 50 nm MOSFET and 250 nm FIBMOS Devices

Vasileska D., Knezevic I., Akis R., Ferry D.K., Arizona State University, US
We investigate quantum-mechanical space quantization effects in conventional MOSFET devices and asymmetric device structure fabricated via focused ion beam technique (FIBMOS device). We find that the inclusion of the quan-tum-mechanical space-quantization effects along the growth [...]

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