Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Gupta, Subhra Sen"'
Discerning chaos in quantum systems is an important problem as the usual route of Lyapunov exponents in classical systems is not straightforward in quantum systems. A standard route is the comparison of statistics derived from model physical systems
Externí odkaz:
http://arxiv.org/abs/2408.04345
Publikováno v:
Physical Review B 105, 014205 (2022)
We study the spectral properties of and spectral-crossovers between different random matrix ensembles (Poissonian, GOE, GUE) in correlated spin-chain systems, in the presence of random magnetic fields, and the scalar spin-chirality term, competing wi
Externí odkaz:
http://arxiv.org/abs/2309.14076
Publikováno v:
Physical Review B 107, 094205 (2023)
We investigate several distinct spectral crossovers amongst various integrable and quantum-chaotic limits of a 1D disordered quantum spin-1/2 model, by tuning the relative amplitudes of various Hamiltonian parameters to retain or break relevant unita
Externí odkaz:
http://arxiv.org/abs/2309.13918
Autor:
Grazioli, C., Alfè, Dario, Krishnakumar, S. R., Gupta, Subhra Sen, Veronese, M., Turchini, S., Bonini, Nicola, Corso, Andrea Dal, Sarma, D. D., Baroni, Stefano, Carbone, C.
The occurrence of a noncollinear magnetic structure at a Mn monolayer grown epitaxially on Fe(100) is predicted theoretically, using spinor density-functional theory, and observed experimentally, using x-ray magnetic circular dichroism (XMCD) and lin
Externí odkaz:
http://arxiv.org/abs/2307.11586
Autor:
Gupta, Subhra Sen
Ever since the discovery of exotic phenomena like high temperature (Tc) superconductivity in the cuprates and colossal magnetoresistance in the manganites, strongly correlated electron systems have become the center of attention in the field of cond
Externí odkaz:
http://hdl.handle.net/2005/421
We study the importance of inter-site coherences and quantum interference effects in the x-ray absorption spectroscopy (XAS) of mixed-valent systems. We demonstrate its importance, first for a simple diatomic mixed-valent molecule to elucidate the ph
Externí odkaz:
http://arxiv.org/abs/1011.1952
Autor:
Gupta, Subhra Sen, Bradley, J. A., Haverkort, M. W., Seidler, G. T., Tanaka, A., Sawatzky, G. A.
Publikováno v:
Phys. Rev. B 84, 075134 (2011)
We develop the theory for shallow-core to valence excitations when the multiplet spread is larger than the core-hole attraction, e.g., if the core and valence orbitals have the same principal quantum number. This results in a cross-over from bound to
Externí odkaz:
http://arxiv.org/abs/1001.5293
Autor:
Sanyal, Prabuddha, Gupta, Subhra Sen, Pakhira, Nandan, Krishnamurthy, H. R., Sarma, D. D., Ramakrishnan, T. V.
A recent, major, puzzle in the core-level photoemission spectra of doped manganites is the observation of a 1-2 eV wide shoulder with intensity varying with temperature T as the square of the magnetization over a T scale of order 200K, an order of ma
Externí odkaz:
http://arxiv.org/abs/0704.3923
Autor:
Okabayashi, J., Ono, K., Mizuguchi, M., Oshima, M., Gupta, Subhra Sen, Sarma, D.D., Mizokawa, T., Fujimori, A., Yuri, M., Chen, C.T., Fukumura, T., Kawasaki, M., Koinuma, H.
Publikováno v:
Journal of Applied Physics; 4/1/2004, Vol. 95 Issue 7, p3573-3575, 3p, 1 Chart, 2 Graphs
Autor:
Nag, Angshuman, Sapra, Sameer, Gupta, Subhra Sen, Prakash, Ankita, Ghangrekar, Ajit, Periasamy, N, Sarma, DD
We have synthesized Mn-doped CdS nanocrystals (NCs) with size ranging from 1.8-3 nm. Photoluminescence (PL) spectra of the doped NCs differ from that of the undoped NCs with an additional peak due to Mn d-d transitions. Electron paramagnetic resonanc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______182::fce755cdd689cb50d4d33e134d311614
http://eprints.iisc.ernet.in/16024/
http://eprints.iisc.ernet.in/16024/