Low-temperature scanning tunneling microscope using closed-cycle refrigerator to achieve refrigeration

A closed-cycle refrigerator and scanning tunnel technology, applied in the field of scanning probe microscopy

Active Publication Date: 2014-07-02
FUDAN UNIV
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Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a low-temperature scanning tunneling microscope that utilizes a closed-cycle refrigerator for refrigeration, which does not need to consume liquid helium for refrigerat

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Embodiment Construction

[0023] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0024] Almost all cryogenic scanning tunneling microscopes today are cooled using liquid helium based Dewar thermostats or continuous flow thermostats. This makes the amount of liquid helium consumed by the system operation very considerable, and the operation cost is high. To obtain a low temperature comparable to that of a liquid helium refrigeration system without using liquid helium, an effective way is to use a closed-cycle refrigerator to cool down. However, the closed-cycle refrigerator has strong mechanical vibration and noise, which limits the application of the closed-cycle refrigerator in the field of low-temperature scanning tunneling microscope with atomic resolution.

[0025] figure 1 Shown is a schema...

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Abstract

The invention discloses a low-temperature scanning tunneling microscope using a closed-cycle refrigerator to achieve refrigeration. The low-temperature scanning tunneling microscope comprises a closed-cycle refrigerator system, a helium heat exchange gas refrigeration vibration isolation interface system, a low-temperature scanning tunneling microscope scanning head system, a vacuum system, a vibration reduction platform and a scanning tunnel microscope control system. According to the low-temperature scanning tunneling microscope, under the condition that no liquid helium is consumed, atomic-scale resolution low-temperature ultrahigh-vacuum scanning tunnel microscopy space imaging and high-energy resolution scanning tunnel spectrum accurate measurement can be achieved like a liquid helium refrigeration system. The technical scheme of closed-cycle refrigeration can also be used for other applications needing lower temperature and low-vibration environments like other members of scanning probe microscope families. Large-range temperature changes can also be achieved through feedback combination of heating elements and temperature measuring elements.

Description

technical field [0001] The invention belongs to the field of scanning probe microscopes, and in particular relates to a low-temperature scanning tunneling microscope which utilizes a closed-cycle refrigerator to refrigerate without consuming liquid helium. technical background [0002] Scanning Tunneling Microscope (STM) is a major member of the Scanning Probe Microscope (SPM) family, invented in 1982 by Binnig and Rohrer of IBM in Zurich, Switzerland. It works using the electron tunneling effect in quantum mechanics. Specifically, when an atomically sharp metal tip is infinitely close to the surface of the probed sample, until only a few or one atom away, if a bias voltage is applied between the probed sample and the metal tip, the tip or the sample will The electrons will tunnel through the vacuum barrier between the two, thus forming a tunneling current. Since the size of the tunneling current decays exponentially with the distance between the tip and the sample, the sc...

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Application Information

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IPC IPC(8): G01Q60/10
Inventor 吴施伟张帅黄迪
Owner FUDAN UNIV
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