1
|
Johnson CW, Schmid AK, Mankos M, Röpke R, Kerker N, Wong EK, Ogletree DF, Minor AM, Stibor A. Near-Monochromatic Tuneable Cryogenic Niobium Electron Field Emitter. PHYSICAL REVIEW LETTERS 2022; 129:244802. [PMID: 36563244 DOI: 10.1103/physrevlett.129.244802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 09/29/2022] [Indexed: 06/17/2023]
Abstract
Creating, manipulating, and detecting coherent electrons is at the heart of future quantum microscopy and spectroscopy technologies. Leveraging and specifically altering the quantum features of an electron beam source at low temperatures can enhance its emission properties. Here, we describe electron field emission from a monocrystalline, superconducting niobium nanotip at a temperature of 5.9 K. The emitted electron energy spectrum reveals an ultranarrow distribution down to 16 meV due to tunable resonant tunneling field emission via localized band states at a nanoprotrusion's apex and a cutoff at the sharp low-temperature Fermi edge. This is an order of magnitude lower than for conventional field emission electron sources. The self-focusing geometry of the tip leads to emission in an angle of 3.7°, a reduced brightness of 3.8×10^{8} A/(m^{2} sr V), and a stability of hours at 4.1 nA beam current and 69 meV energy width. This source will decrease the impact of lens aberration and enable new modes in low-energy electron microscopy, electron energy loss spectroscopy, and high-resolution vibrational spectroscopy.
Collapse
Affiliation(s)
- C W Johnson
- Lawrence Berkeley National Lab, Molecular Foundry, Berkeley, California 94720, USA
| | - A K Schmid
- Lawrence Berkeley National Lab, Molecular Foundry, Berkeley, California 94720, USA
| | - M Mankos
- Electron Optica Inc., Palo Alto, California 94303, USA
| | - R Röpke
- Institute of Physics and LISA+, University of Tübingen, Tübingen 72076, Germany
| | - N Kerker
- Institute of Physics and LISA+, University of Tübingen, Tübingen 72076, Germany
| | - E K Wong
- Lawrence Berkeley National Lab, Molecular Foundry, Berkeley, California 94720, USA
| | - D F Ogletree
- Lawrence Berkeley National Lab, Molecular Foundry, Berkeley, California 94720, USA
| | - A M Minor
- Lawrence Berkeley National Lab, Molecular Foundry, Berkeley, California 94720, USA
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA
| | - A Stibor
- Lawrence Berkeley National Lab, Molecular Foundry, Berkeley, California 94720, USA
- Electron Optica Inc., Palo Alto, California 94303, USA
- Institute of Physics and LISA+, University of Tübingen, Tübingen 72076, Germany
| |
Collapse
|
3
|
Dorogi M, Gomez J, Osifchin R, Andres RP, Reifenberger R. Room-temperature Coulomb blockade from a self-assembled molecular nanostructure. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:9071-9077. [PMID: 9979898 DOI: 10.1103/physrevb.52.9071] [Citation(s) in RCA: 179] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
4
|
Schaefer DM, Patil A, Andres RP, Reifenberger R. Elastic properties of individual nanometer-size supported gold clusters. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:5322-5332. [PMID: 9979413 DOI: 10.1103/physrevb.51.5322] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
5
|
Rubio A, Serra L. Dielectric screening effects on the photoabsorption cross section of embedded metallic clusters. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:18222-18229. [PMID: 10008462 DOI: 10.1103/physrevb.48.18222] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
6
|
Lin ME, Andres RP, Reifenberger R, Huffman DR. Electron emission from an individual, supported C60 molecule. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:7546-7553. [PMID: 10004750 DOI: 10.1103/physrevb.47.7546] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|