Zobrazeno 1 - 10
of 197
pro vyhledávání: '"Andersen, David R."'
Autor:
Shah, Sarang, Subramanian, Smitha, K., Avinash C., Andersen, David R., Skidmore, Warren, Anupama, G. C., Delgado, Francisco, Gillies, Kim, Gopinathan, Maheshwar, Ramaprakash, A. N., Reddy, B. E., Sivarani, T., Subramaniam, Annapurni
Publikováno v:
The Astronomical Journal, 168:59 (28pp), 2024 August
At first light, the Thirty Meter Telescope (TMT) near-infrared (NIR) instruments will be fed by a multiconjugate adaptive optics instrument known as the Narrow Field Infrared Adaptive Optics System (NFIRAOS). NFIRAOS will use six laser guide stars to
Externí odkaz:
http://arxiv.org/abs/2408.08180
Autor:
Daws, Sawsan, Andersen, David R.
Graphene has been shown to exhibit a nonlinear response due to its unique band structure. In this paper, we study the terahertz (THz) response metallic armchair graphene nanoribbons, specifically current density and Rabi oscillations beyond the semic
Externí odkaz:
http://arxiv.org/abs/2107.11694
Autor:
Jin, Qiutong, Andersen, David R.
Publikováno v:
J. Physics Commun. 3, 105014 (2019)
Rabi oscillations in two-level Dirac systems have been shown to alter the frequency content of the system's nonlinear response. In particular, when considering Rabi oscillations in a quantum model beyond the semiclassical Boltzmann theory, even harmo
Externí odkaz:
http://arxiv.org/abs/1901.11466
Akademický článek
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Autor:
Wang, Yichao, Andersen, David R.
Publikováno v:
IEEE J. Sel. Topics in Quantum Electronics 23 5100506 (2017)
We present a theoretical description of the nonlinear response induced by an elliptically-polarized terahertz beam normally-incident on intrinsic and extrinsic metallic armchair graphene nanorib- bons. Our results show that using a straightforward ex
Externí odkaz:
http://arxiv.org/abs/1606.00676
Autor:
Ono, Yoshito H., Akiyama, Masayuki, Oya, Shin, Lardiere, Olivier, Andersen, David R., Correia, Carlos, Jackson, Kate, Bradley, Colin
In tomographic adaptive-optics (AO) systems, errors due to tomographic wave-front reconstruction limit the performance and angular size of the scientific field of view (FoV), where AO correction is effective. We propose a multi time-step tomographic
Externí odkaz:
http://arxiv.org/abs/1604.02849
Autor:
Wang, Yichao, Andersen, David R.
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics, VOL. 23, NO. 1, 5100108, Jan.-Feb. 2017
We use time dependent perturbation theory to study quantum size effects on the terahertz nonlinear response of metallic graphene armchair nanoribbons of finite length under an applied electric field. Our work shows that quantization due to the finite
Externí odkaz:
http://arxiv.org/abs/1603.09394
Autor:
Wang, Yichao, Andersen, David R.
Publikováno v:
Phys. Rev. B 93, 235430 (2016)
We compute the terahertz third-order nonlinear conductance of metallic armchair graphene nanoribbons using time-dependent perturbation theory. Significant enhancement of the intrinsic third-order conductance over the result for instrinsic 2D single-l
Externí odkaz:
http://arxiv.org/abs/1603.06027
Autor:
Martinsson, Thomas P. K., Verheijen, Marc A. W., Bershady, Matthew A., Westfall, Kyle B., Andersen, David R., Swaters, Rob A.
Publikováno v:
A&A 585, A99 (2016)
We present results from 21 cm radio synthesis imaging of 28 spiral galaxies from the DiskMass Survey obtained with the VLA, WSRT, and GMRT facilities. We detail the observations and data reduction procedures and present a brief analysis of the radio
Externí odkaz:
http://arxiv.org/abs/1510.07666
Autor:
Swaters, Robert A., Bershady, Matthew A., Martinsson, Thomas P. K., Westfall, Kyle B., Andersen, David R., Verheijen, Marc A. W.
We present the correlation between the extrapolated central disk surface brightness (mu) and extrapolated central surface mass density (Sigma) for galaxies in the DiskMass sample. This mu-Sigma-relation has a small scatter of 30% at the high-surface-
Externí odkaz:
http://arxiv.org/abs/1411.4589