This Special Issue of the Journal of Low-Temperature Physics contains original contributions to the 19th International Workshop on Low-Temperature Detectors (LTD19). The workshop was held from July 19 to July 22, 2021. The local organizing committee was drawn from the U.S. National Institute of Standards and Technology (NIST), the University of Colorado Boulder, Denver University, and Los Alamos National Laboratory. While the intended location for the workshop was in the U.S. Rocky Mountain region, because of the Covid19 pandemic, the workshop was entirely virtual.

The International Workshop on Low-Temperature Detectors is held every two years in order to provide developers and users of low-temperature sensors an opportunity to present and discuss new results in the field. Some key statistics for the LTD19 workshop are as follows: about 475 registered participants spanning 17 time zones, 11 industry exhibitors, 11 invited talks, 89 contributed talks, 240 posters, 43 live hours of program material including 31 for oral presentations and 12 for posters, 2 virtual tours of the NIST laboratories, and 4 exhibitor hours. A digital record of the workshop is available here: https://www.nist.gov/news-events/events/2021/07/19th-international-workshop-low-temperature-detectors-ltd19.


In addition, approximately 160 proceedings manuscripts will be published in this Special Issue. The manuscripts reflect the breadth and vitality of the LTD field. They describe work on device science, instrument development, supporting technologies, and the wide and growing range of LTD applications. All the manuscripts were reviewed by two anonymous referees selected from within the LTD field. The editors thank the authors, the many selfless manuscript reviewers, and the staff of Springer and JLTP, especially Journal Editor Paul Leiderer, for their work to produce this Special Issue.


The organization of LTD19 would not have been possible without the efforts of the Local Organizing Committee, the session chairs, the staff of NIST Conference Services including Rachel Trello, Pauline Truong, and Gladys Arrisueno, and the staff of Sidem Group, especially Mark Gifford. We would also like to thank the members of the LTD International Advisory Committee, especially Angelo Nucciotti, for sharing their experiences from previous LTDs.

Joel Ullom, NIST, and University of Colorado Boulder, Lead Guest Editor

Jason Austermann, NIST, Guest Editor

Katrina Koehler, Houghton University, and Los Alamos National Laboratory, Guest Editor


Johannes Hubmayr, NIST, Guest Editor

The members of the LTD19 Local Organizing Committee and the LTD International Advisory Committee are given below

LTD19 Local Organizing Committee

Joel Ullom (Conference Chair), NIST and University of Colorado Boulder

Douglas Bennett, NIST

Mark Croce, Los Alamos National Laboratory

Nils Halverson, University of Colorado Boulder

Gene Hilton, NIST

Johannes Hubmayr, NIST

Katrina Koehler, Houghton University and Los Alamos National Laboratory

Adriana Lita, NIST

Ben Mates, NIST

Kelsey Morgan, University of Colorado Boulder and NIST

Sae Woo Nam, NIST

Michael Rabin, Los Alamos National Laboratory

Daniel Swetz, NIST

Jordan Wheeler, NIST

Barry Zink, Denver University

LTD International Advisory Committee

Jochem Baselmans, Technical University Delft and Netherlands Institute for Space Research

Karl Berggren, Massachusetts Institute of Technology

Joern Beyer, Physikalisch-Technische Bundesanstalt

Blas Cabrera, Stanford University

Clarence L. Chang, Argonne National Laboratory and the University of Chicago

Maurice Chapellier, French National Centre for Scientific Research IN2P3

Hsiao-Mei (Sherry) Cho, SLAC National Accelerator Laboratory

Roberto Cristiano, CNR-SPIN Institute of Superconductors, Innovative Materials, and Devices

Mark Croce, Los Alamos National Laboratory

Christian Enss, Heidelberg University

Enectali Figueroa-Feliciano, Northwestern University

Stephan Friedrich, Lawrence Livermore National Laboratory

Flavio Gatti, Università di Genova

Kent Irwin, Stanford University

Sebastian Kempf, Karlsruhe Institute of Technology

Caroline Kilbourne, NASA Goddard Space Flight Center

Yong-Hamb Kim, Institute for Basic Science

Alexander Kozorezov, Lancaster University

Martin Loidl, Laboratoire National Henri Becquerel

Ilari Maasilta, University of Jyväskylä

Benjamin A. Mazin, University of California Santa Barbara

Dan McCammon, University of Wisconsin

Kazuhisa Mitsuda, National Astronomical Observatory of Japan

Alessandro Monfardini, University Grenoble Alpes, CNRS, Grenoble INP, Institut Néel

Harvey Moseley, Quantum Circuits, Inc

Angelo Nucciotti, Università di Milano Bicocca

Masataka Ohkubo, National Institute of Advanced Industrial Science, and Technology and University of Tsukuba

Federica Petricca, Max Planck Institute for Physics

Franz Proebst, Max Planck Institute for Physics

Matt Pyle, University of California Berkeley

Michael Rabin, Los Alamos National Laboratory

Bernard Sadoulet, University of California Berkeley

Joel Ullom, National Institute of Standards and Technology and University of Colorado Boulder

Betty Young, Santa Clara University