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Discovery of segmented Fermi surface induced by Cooper pair momentum

Journal Article · · Science
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  1. School of Physics and Astronomy, Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China.
  2. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
  3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
  4. Department of Physics, Zhejiang University, Hangzhou 310027, Zhejiang, China.
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Imaging a peculiar Fermi surface

Running a current through a superconductor can cause the superconducting gap to close on a section of the Fermi surface. However, observing this segmented Fermi surface directly is tricky. To do so, Zhuet al. worked with a thin film of the topological insulator bismuth telluride placed on top of superconducting niobium diselenide. A small applied magnetic field caused a screening current, which in turn led to a segmented Fermi surface in the topological insulator layer. Using a scanning tunneling microscope, the researchers were able to map out this Fermi surface. —JS

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Northeastern Univ., Boston, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
SC0018945; SC0019275
OSTI ID:
1980724
Journal Information:
Science, Vol. 374, Issue 6573; ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English

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