Spin Polarized Carrier Devices

A spin-polarized and carrier technology used in the field of polarimeters

Inactive Publication Date: 2012-02-08
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of optically active samples, an additional rotation angle θ is required

Method used

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Embodiment Construction

[0043] Device structure

[0044] refer to Figure 1(b) , 1(a) and 2 to 5, show an electro-optic, spin-polarized carrier device. The device 1 comprises mesas 2 defined by trench isolation by using etched trenches 3 . The mesas 2 are used to pattern an aluminum gallium arsenide / gallium arsenide (AlGaAs / GaAs) heterostructure 4 on an undoped GaAs substrate 5 ( FIG. 1( a )). The mesa 2 is stepped with an upper unetched plane 6 1 and lower etch plane 6 2 . Thus, the mesa 2 is divided into a first and a second part 2 along the step edge 7 1 ,2 2 . Laddering the mesa 2 so that in the first part 2 of the mesa 2 1 Form two-dimensional hole gas (2DHG) 8 and the second part 2 of the mesa 2 2 A two-dimensional electron gas (2DEG) is formed9.

[0045] 2DEG 9 aggregates have sheet concentration n 2DEG =2.5×10 11 and mobility μ=3×10 3 cm 2 / Vs electrons. However, part 9' of 2DHG located below 2DHG 8 is depleted.

[0046] The mesa 2 comprises a hall bar structure 10 spanning th...

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Abstract

The present invention relates to a spin-polarized carrier device comprising: a carrier channel, including a non-ferromagnetic semiconductor, wherein the carriers exhibit spin-orbit coupling in the carrier channel; a semiconductor of the opposite conductivity type to the channel a region of material for forming a junction with the channel for injecting spin-polarized carriers into one end of the channel; and at least one wire connected to the channel for measuring a lateral voltage across the channel.

Description

technical field [0001] The present invention relates to a spin-polarized charge carrier device and more particularly, but not exclusively, to a polarimeter. Background technique [0002] Polarimeters can be used to measure changes in polarization induced by the optical rotation of materials such as anisotropic crystalline solids and liquids containing chiral molecules. [0003] A conventional polarimeter typically consists of a pair of linearly polarized mirrors and a photodetector, such as a photodiode. Light from a monochromatic source sequentially passes through a first polarizing mirror with a fixed orientation, a sample, and a second polarizing mirror (or "analyzer"). Photodetectors are used to detect the intensity of light reaching the photodetector from the analyzer. [0004] Rotating the analyzer relative to the first polarizing mirror changes the intensity of light reaching the photodetector. Therefore, in the absence of an optically active sample, the angle requ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/21G01N21/17
CPCH01L29/66984G01J4/04G01J4/00
Inventor 耶尔格·冯德里西托马斯·琼沃思安德鲁·欧文杰洛·希诺娃
Owner HITACHI LTD
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