Rakshya Khatiwada

Education

BS: Linfield College

PhD: Purdue University

Research Interests

Ultra-low noise detector development for Axion Dark Matter eXperiment (ADMX)

Quantum sensors, qubits, quantum noise-limited devices/amplifiers and their application in precision experiments and dark matter detection, low-noise cryogenic systems

Physics beyond the Standard Model, fundamental symmetries and interactions, experimental tests of symmetry-violating interactions, spin-dependent and independent interactions between fermions

Publications

• N. Du, R. Khatiwada, et al., “Extended Search for the Invisible Axion with the Axion Dark Matter Experiment”, Phys. Rev. Lett. 124, 101303 (2020).
• C. Boutan, R. Khatiwada, et al., “4-7 GHz Limits on the Axion-Photon Coupling from a Multi-Mode, Piezoelectrically Tuned Microwave Cavity Search”, Phys. Rev. Lett. 121, 261302 (2018).
• G. Rybka, R. Khatiwada, et al., “Search for Invisible Axion Dark Matter with the Axion Dark Matter Experiment”,Phys. Rev. Lett. 120, 151301 (2018).
• J. Hoskins, R. Khatiwada, et al., “Modulation sensitive search for nonvirialized dark-matter axions”, Phys. Rev. D 94, 8, 082001 (2016).
• J.V. Sloan, R. Khatiwada et al., “Limits on axion-photon coupling or on local axion density: Dependence on models of the Milky Way’s dark halo”, Physics of the Dark Universe 14, 95–102 (2016).
• R. Khatiwada, M. Khosravi, and W. M. Snow, “Low magnetic susceptibility test masses for precision measurements”, Measure Sci. Tech. 27, 2 025902 (2016). arXiv: 1506.09199.
• T.M. Leslie, E. Weisman, R. Khatiwada, and J.C. Long, “Prospects for electron spin-dependent short-range force experiments with rare earth iron garnet test masses”, Phys. Rev. D 89, 114022 (2014). arXiv: 1401.6730.
• H. Yan, K. Li, R. Khatiwada, E. Smith, W. M. Snow, C.B. Fu, P.-H. Chu, H. Gao, W. Zheng, “A frequency determination method for digitized NMR signals”, Commun. Comput. Phys. 15, 1343 (2014). arXiv: 1305.3676.
• P.-H. Chu, A. Dennis, C. B. Fu, H. Gao, R. Khatiwada, G. Laskaris, K. Li, E. Smith, W. M. Snow, H.Yan, and W. Zheng, “Laboratory Search for Spin-dependent Short-range Force from Axion-Like-Particles using Optically Polarized 3He gas”, Phys. Rev. D 87, 011105(R) (2013). arXiv: 1211.2644.

Grants

National Quantum Initiative “High throughput quantum sensor and materials testing facility”

Dark Matter New Initiatives “Axion Dark Matter Experiment Extended frequency”

Community Service

Outreach through science talks and webinars to small colleges and underprivileged communities (US and Nepal)

Career advisor to undergraduate and graduate students and women in science (US and Nepal)

American Physical Society (APS) IDEA Network

Editorial Boards

Institute of Physics (IOP) science journals

Professional Activities

American Physical Society (APS)

Chicago Quantum Exchange

Expertise

Dark matter instrumentation

Quantum devices and sensors for dark matter detection

Mesoscopic range spin-dependent interaction between fermions

Additional Info

In the media:

https://www.symmetrymagazine.org/article/dark-matter-decoys

https://news.fnal.gov/2019/11/admx-experiment-places-worlds-best-constraint-on-dark-matter-axions/

https://www.facebook.com/watch/live/?v=183644975848392&ref=watch_permalink

https://www.facebook.com/watch/live/?v=2471698606452569&ref=watch_permalink

https://www.reddit.com/r/science/comments/8ggres/hi_we_are_scientists_with_the_admx_collaboration/