Superconductor/Semiconductor Junctions

1. Front Matter

   Pages I-IX

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2. Introduction

   Pages 1-3

3. Carrier Transport Through a Superconductor/Normal-Conductor Interface

   Pages 5-19

4. Fabrication of Superconductor/Two-Dimensional-Electron-Gas Structures

   Pages 21-30

5. Transport Studies on Single Superconductor/Two-Dimensional-Electron-Gas Interfaces

   Pages 31-46

6. Superconductor/Two-Dimensional-Electron-Gas/Superconductor Junctions: Voltage-Carrying State

   Pages 47-64

7. Josephson Current in Superconductor/Two-Dimensional-Electron-Gas Junctions

   Pages 65-94

8. Gate-Controlled Superconductor/Two-Dimensional-Electron-Gas Junctions

   Pages 95-110

9. Nonequilibrium Josephson Current

   Pages 111-132

10. Conclusion

    Pages 133-134

11. Back Matter

    Pages 135-145

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The present book covers the transport properties of superconductor/two dimensional electron gas Josephson junctions. Starting with the basic el ement, a superconductor/two dimensional electron gas interface, phase co herent Andreev reflection in hybrid Josephson junctions is introduced and further on, multiterminal structures are discussed. Special care is taken on explaining the underlying theoretical concepts related to the transport mech anisms. Employing a two dimensional electron gas in a semiconductor as a normal conductor opens up the possibility to observe effects not found in purely metallic junctions. One example is the light sensitivity of the semi conductor, which has a direct impact on the supercurrent in the Josephson junction. Many of the effects reported here rely on the fast technological progress in the epitaxial growth of III V semiconductor heterostructures. By using these layer systems, fascinating quantum effects have been found. Two examples out of many are the quantized conductance in a point contact and electron optics using ballistic electron beams. By combining heterostructures with su perconductors, many of the effects found in purely semiconductor systems can in a sense, be transferred to the superconducting state. A prominent example is the quantization of the critical current in a superconducting quantum point contact.

• Andreev reflection
• Josephson effect
• Josephson junction
• Mesoscopic superconductivity
• Semiconductor
• Superconductor
• electron gases semiconductors
• two-dimensional

• Forschungszentrum Jülich, Institute für Schichten und Grenzflächen (ISG), Jülich, GERMANY

  Thomas Schäpers

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