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Physics

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Displaying 226 - 250 of 4525

Accurate measurement of the loss rate of cold atoms due to background gas collisions for the quantum-based cold atom vacuum standard

August 1, 2023
Author(s)
Daniel Barker, James A. Fedchak, Jacek Klos, Julia Scherschligt, Abrar Sheikh, Eite Tiesinga, Stephen Eckel
We present measurements of thermalized collisional rate coefficients for ultra-cold $^7$Li and $^87}$Rb colliding with room-temperature He, Ne, N$_2$, Ar, Kr, and Xe. In our experiments, a combined flowmeter and dynamic expansion system, a vacuum metrology

A quantitative theoretical model of the boson peak based on stringlet excitations

July 24, 2023
Author(s)
Jack F. Douglas, Cunyuan Jiang, Matteo Baggioli
The boson peak (BP), a low-energy excess in the vibrational density of states over the phonon Debye contribution, is usually identified as one of the distinguishing features between ordered crystals and amorphous solid materials. Despite decades of efforts

Exponentially correlated Hylleraas-Configuration Interaction studies of atomic systems. III Upper and Lower Bounds to He-Sequence Oscillator Strengths for the Resonance singlet S to singlet P Transition

July 22, 2023
Author(s)
James S. Sims, Bholanath Padhy, Maria Ruiz
A generalization of the Hylleraas-Configuration Interaction method (Hy-CI) first proposed by Wang et al., the Exponentially Correlated Hylleraas-Configuration Interaction method (E-Hy-CI) in which the single rij of an Hy-CI wave function is generalized to

Tailoring microcombs with inverse-designed, meta-dispersion microresonators

July 17, 2023
Author(s)
Erwan Lucas, Su-Peng Yu, Travis Briles, David Carlson, Scott Papp
Nonlinear wave mixing in optical microresonators ofers new perspectives to generate compact optical-frequency microcombs, which enable an ever-growing number of applications. Microcombs exhibit a spectral profle that is primarily determined by their

ON THE DEVELOPMENT OF AN OPTICAL RUBIDIUM VECTOR ATOMIC MAGNETOMETER

July 16, 2023
Author(s)
Ying-Ju Wang, John Kitching, Isaac Fan, Yang Li
The precise measurement of magnetic fields is a fundamental tool of remote sensing. However, accurately measuring the direction of magnetic fields is challenging with atomic magnetometers. The standard approach of collecting vector measurements involves

Graphene-Based Star-Mesh Resistance Networks

July 12, 2023
Author(s)
Dean G. Jarrett, Ching-Chen Yeh, Shamith Payagala, Alireza Panna, Yanfei Yang, Linli Meng, Swapnil Mhatre, Ngoc Thanh Mai Tran, Heather Hill, Dipanjan Saha, Randolph Elmquist, David B. Newell, Albert Rigosi

Universal visible emitters in nanoscale integrated photonics

June 30, 2023
Author(s)
Gregory Spektor, David Carlson, Zachary Newman, Jinhie Lee Skarda, Neil Sapra, Logan Su, Sindhu Jammi, Andrew Ferdinand, Amit Agrawal, Jelena Vuckovic, Scott Papp
Visible wavelength lasers control quantum matter of atoms and molecules, enable frontiers of physical sensing, and are foundational for various applications. The development of visible integrated photonics opens the possibility for scalable circuits with

Comment on "Search for explanation of the neutron lifetime anomaly"

June 23, 2023
Author(s)
Fred Wietfeldt, Ripan Biswas, Jimmy Caylor, Bret Crawford, Maynard Dewey, Nadia Fomin, Geoffrey Greene, Christopher Haddock, Shannon Hoogerheide, Hans Mumm, Jeffrey Nico, William Snow, Joseph Zuchegno
We respond to issues raised by Serebrov et al. in a recent paper regarding systematic effects in the beam neutron lifetime experiment performed at NIST. We show that these effects were considered in the original analyses and that our corrections and

Oxidation caused by water outgassed from the thermal blanket on the SDO spacecraft

June 23, 2023
Author(s)
Robert F. Berg, Charles S. Tarrio, FRANCIS EPARVIER, ANDREW JONES
The Solar Dynamics Observatory (SDO) is a sun-observing spacecraft that includes two spectrometers that use aluminum membranes to filter solar radiation. The transmission of those filters degraded by a factor of 5 during the first five years after launch

Weak-Measurement-Induced Heating in Bose-Einstein Condensates

June 23, 2023
Author(s)
Emine Altuntas, Ian Spielman
Ultracold atoms are an ideal platform for understanding system-reservoir dynamics of many-body systems. Here, we study quantum back-action in atomic Bose-Einstein condensates, weakly interacting with a far-from resonant, i.e., dispersively interacting

What limits the voltage of GaAs photovoltaic devices under low indoor light?

June 19, 2023
Author(s)
Behrang Hamadani, Margaret Stevens, Matthew Lumb, Kenneth Schmieder
The external radiative efficiency of a photovoltaic device is a useful metric to compare different photovoltaic technologies and material systems. However, under low-intensity indoor lighting, a particular open-circuit voltage dependence arises that cannot