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Non-local resistance-type nuclear magnetic resonance measurement method

A nuclear magnetic resonance and measurement method technology, applied in the field of spintronics, can solve problems such as hindering detection and characterization, and achieve the effects of improving measurement accuracy, avoiding Joule heating, and subtle changes in sensitivity

Active Publication Date: 2020-12-22
JILIN UNIV
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Problems solved by technology

At this time, the measured substate is actually in a non-equilibrium state, which seriously hinders the detection and characterization of its intrinsic properties.
However, the effect of Hall bias on the quantum state has been seriously ignored in previous transport measurements and resistive NMR measurements.

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  • Non-local resistance-type nuclear magnetic resonance measurement method
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Embodiment Construction

[0021] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0022] Schematic diagram of InSb / AlInSb two-dimensional electron gas Hall strip sample figure 1 As shown, the Hall measuring area 1 has a length of l-100 μm and a width of w-30 μm. The sample Landes g factor g ~ -50, effective mass m ~ 0.015m e (m e : electron effective mass), electron gas density is 2.8×10 15 m -2 , Electron mobility is 19m 2 / Vs, these parameters ensure that all electrons only occupy the first subband of the two-dimensional electron gas energy band and form a quantum Hall ferromagnetic state under the condition of lower than the maximum working magnetic field (15T) in the laboratory. The quantum state is formed when the angle between the normal line of the sample and the direction of the static magnetic field of the additional magnet of the thermostat is ~64°, and the magnetic field is ~13T. The longitudinal resist...

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Abstract

The invention relates to a non-local resistance-type nuclear magnetic resonance measurement method, and belongs to the technical field of spintronics. The method mainly comprises the following steps:placing a two-dimensional electron gas Hall strip-shaped sample for non-local measurement in a cryostat with a sample rotary table so as to form a quantum Hall ferromagnetic state with a magnetic domain structure; and performing non-local resistance measurement on the quantum Hall ferromagnetic state, performing resistance type nuclear magnetic resonance measurement on the quantum state accordingto the obtained relation graph of the resistance peak and the inclination angle of the quantum Hall ferromagnetic state, and performing measuring for nuclear spin relaxation time T1 and nuclear spin decoherence time T2 on the quantum Hall ferromagnetic state according to the obtained nuclear magnetic resonance graph. By introducing a non-local measurement configuration, dynamic nuclear polarization under small current is realized, so that the measured quantum state is always in a balanced state, the non-local resistance of the measured quantum state is two orders of magnitudes smaller than normal measurement resistance, and the resistance type nuclear magnetic resonance measurement precision is improved by one order of magnitude.

Description

technical field [0001] The invention belongs to the technical field of spintronics, and relates to a method with ultra-high sensitivity and minimally invasive detection of quantum state intrinsic characteristics and novel topological states. Background technique [0002] NMR technology with ultra-high detection sensitivity, accuracy and resolution has been widely used in many scientific research fields. Usually, high signal-to-noise ratio measurements require that the number of sample nuclei measured by this technique is not less than 10 15 . Obviously, this requirement is difficult to be met in low-dimensional materials or devices (for example, the number of atomic nuclei in a two-dimensional electron gas system confined by a semiconductor single quantum well is less than 10 8 ). To this end, the discoverer of the quantum Hall effect, the von Klitzing research team at the Max Planck Institute in Germany, used the dynamic nuclear polarization method induced by electron sp...

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/085
Inventor 刘洪武杨凯锋
Owner JILIN UNIV
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