Ultracold Electrons via Near-Threshold Photoemission from Single-Crystal Cu(100)
Abstract
Achieving a low mean transverse energy or temperature of electrons emitted from the photocathode-based electron sources is critical to the development of next-generation and compact x-ray free electron lasers and ultrafast electron diffraction, spectroscopy, and microscopy experiments. In this Letter, we demonstrate a record low mean transverse energy of 5 meV from the cryo-cooled (100) surface of copper using near-threshold photoemission. Further, we also show that the electron energy spread obtained from such a surface is less than 11.5 meV, making it the smallest energy spread electron source known to date: more than an order of magnitude smaller than any existing photoemission, field emission, or thermionic emission based electron source. Overall, our measurements also shed light on the physics of electron emission and show how the energy spread at few meV scale energies is limited by both the temperature and the vacuum density of states.
- Authors:
-
[1];
[2];
[3];
[4]
- Arizona State Univ., Tempe, AZ (United States)
- Univ. of Illinois, Chicago, IL (United States)
- Cornell Univ., Ithaca, NY (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1783107
- Grant/Contract Number:
- AC02-05CH11231; SC0017621; PHY-1549132
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 125; Journal Issue: 5; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; electron sources; photoemission spectroscopy
Citation Formats
Karkare, Siddharth, Adhikari, Gowri, Schroeder, W. Andreas, Nangoi, J. Kevin, Arias, Tomas, Maxson, Jared, and Padmore, Howard. Ultracold Electrons via Near-Threshold Photoemission from Single-Crystal Cu(100). United States: N. p., 2020.
Web. doi:10.1103/physrevlett.125.054801.
Karkare, Siddharth, Adhikari, Gowri, Schroeder, W. Andreas, Nangoi, J. Kevin, Arias, Tomas, Maxson, Jared, & Padmore, Howard. Ultracold Electrons via Near-Threshold Photoemission from Single-Crystal Cu(100). United States. https://doi.org/10.1103/physrevlett.125.054801
Karkare, Siddharth, Adhikari, Gowri, Schroeder, W. Andreas, Nangoi, J. Kevin, Arias, Tomas, Maxson, Jared, and Padmore, Howard. Thu .
"Ultracold Electrons via Near-Threshold Photoemission from Single-Crystal Cu(100)". United States. https://doi.org/10.1103/physrevlett.125.054801. https://www.osti.gov/servlets/purl/1783107.
@article{osti_1783107,
title = {Ultracold Electrons via Near-Threshold Photoemission from Single-Crystal Cu(100)},
author = {Karkare, Siddharth and Adhikari, Gowri and Schroeder, W. Andreas and Nangoi, J. Kevin and Arias, Tomas and Maxson, Jared and Padmore, Howard},
abstractNote = {Achieving a low mean transverse energy or temperature of electrons emitted from the photocathode-based electron sources is critical to the development of next-generation and compact x-ray free electron lasers and ultrafast electron diffraction, spectroscopy, and microscopy experiments. In this Letter, we demonstrate a record low mean transverse energy of 5 meV from the cryo-cooled (100) surface of copper using near-threshold photoemission. Further, we also show that the electron energy spread obtained from such a surface is less than 11.5 meV, making it the smallest energy spread electron source known to date: more than an order of magnitude smaller than any existing photoemission, field emission, or thermionic emission based electron source. Overall, our measurements also shed light on the physics of electron emission and show how the energy spread at few meV scale energies is limited by both the temperature and the vacuum density of states.},
doi = {10.1103/physrevlett.125.054801},
journal = {Physical Review Letters},
number = 5,
volume = 125,
place = {United States},
year = {Thu Jul 30 00:00:00 EDT 2020},
month = {Thu Jul 30 00:00:00 EDT 2020}
}
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