Work

Experimental evidence for a surface distribution of two-level systems in superconducting lithographed microwave resonators

Year: 2008

Type: article

Abstract: We present measurements of the temperature-dependent frequency shift of five niobium superconducting coplanar waveguide microresonators with center strip widths ranging from 3to50μm, taken at temperatures in the range of 100–800mK, far below the 9.2K transition temperature of niobium. These data agree well with the two-level system (TLS) theory. Fits to this theory provide information on the number of TLSs that interact with each resonator geometry. The geometrical scaling indicates a surface distribution of TLSs and the data are consistent with a TLS surface layer thickness of the order of a few nanometers, as might be expected for a native oxide layer.

Source: Applied Physics Letters

DOI: 10.1063/1.2906373

Authors: Jiansong Gao, Miguel Daal, Anastasios Vayonakis, Shwetank Kumar, Jonas Zmuidzinas, Bernard Sadoulet, Benjamin A. Mazin, Peter K. Day, Henry G. Leduc

Institutions: California Institute of Technology, University of California, Berkeley, Jet Propulsion Laboratory

Language: English

Topic: Superconducting and THz Device Technology

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: Gordon and Betty Moore Foundation, California Institute of Technology, Science Mission Directorate

OpenAlex ID: W2012470259

FWCI: 13.68

Cites: 19

Cited by: 400

Related to: 10