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Related Concept Videos

Biasing of FET01:22

Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Biasing of P-N Junction01:16

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity arises...
MOSFET01:16

MOSFET

The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...

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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Published on: July 24, 2015

A valley-filtering switch based on strained graphene.

Feng Zhai1, Yanling Ma, Ying-Tao Zhang

  • 1Center of Statistical and Theoretical Condensed Matter Physics and Department of Physics, Zhejiang Normal University, Jinhua 321004, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 6, 2011
PubMed
Summary
This summary is machine-generated.

Researchers explored how substrate strain and magnetic fields in graphene affect electron transport. Switching magnetic stripe alignment significantly altered conductance, demonstrating a tunable valley-filter and magnetoresistance device.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene exhibits unique electronic properties due to its 2D structure.
  • Valleytronics utilizes electron valley properties for information processing.
  • Ferromagnetic materials can create localized magnetic fields.

Purpose of the Study:

  • To investigate valley-dependent charge transport in graphene.
  • To explore the effects of substrate strain and ferromagnetic stripe alignment on graphene's electronic properties.
  • To demonstrate a graphene-based device with tunable valley filtering and magnetoresistance.

Main Methods:

  • Fabrication of a graphene device with integrated ferromagnetic stripes.
  • Application of substrate strain and controlled magnetic field configurations.
  • Measurement of charge transport properties, including conductance and valley polarization.
  • Theoretical analysis of valley-dependent transmission through the modulated graphene sheet.

Main Results:

  • Significant changes in total conductance, valley polarization, and valley conductance excess were observed upon switching magnetic stripe alignment.
  • The observed changes are attributed to the modulation of valley-related transmission by inhomogeneous magnetic fields.
  • The device demonstrated tunable valley-filtering capabilities across a broad Fermi energy range.

Conclusions:

  • The proposed graphene structure acts as an effective valley-filtering switch.
  • The device exhibits significant magnetoresistance, controllable by magnetic stripe alignment.
  • This work opens possibilities for novel spintronic and valleytronic devices.