Despre
Software Engineer. Physicist.
Activitate
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Einstein, Curie, Bohr, Planck, Heisenberg, Schrödinger… how many Nobel Prize laureates can you spot? Some of the world’s most notable physicists…
Einstein, Curie, Bohr, Planck, Heisenberg, Schrödinger… how many Nobel Prize laureates can you spot? Some of the world’s most notable physicists…
Apreciat de Adrian Roman
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In an interview with The New York Times, TerraPower Founder and Chairman Bill Gates discussed the future of the Natrium™ demonstration project in…
In an interview with The New York Times, TerraPower Founder and Chairman Bill Gates discussed the future of the Natrium™ demonstration project in…
Apreciat de Adrian Roman
Experiență
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Invictus Wings SRL
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Studii
Publicații
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Triple dot system coupled to topological insulators: A numerical renormalization group analysis of the SU(3) attractive Anderson model
AIP Publishing
We consider the SU(3) attractive Anderson model, which can be realized in a triple-dot system, coupled to external leads that support chiral edge modes, and study its spectral and transport properties using the renormalization group approach. At the symmetric point, where the average occupation is 〈(n〉 = 3/2, a resonance develops in the spectral functions, which differs significantly from the regular Kondo effect, and corresponds to trionic processes between states with zero and triple…
We consider the SU(3) attractive Anderson model, which can be realized in a triple-dot system, coupled to external leads that support chiral edge modes, and study its spectral and transport properties using the renormalization group approach. At the symmetric point, where the average occupation is 〈(n〉 = 3/2, a resonance develops in the spectral functions, which differs significantly from the regular Kondo effect, and corresponds to trionic processes between states with zero and triple occupation of the dot system.
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The thermal conductance of a two-channel Kondo model
Phys. Rev. B 83, 245308 (2011)
A theory of thermal transport in a two-channel Kondo system, such as the one formed by a small quantum dot coupled to two leads and to a larger dot, is formulated. The interplay of the two screening constants allows an exploration of the Fermi liquid and non-Fermi liquid regimes. By using analytical, as well as numerical renormalization group methods, we study the temperature dependence of the thermal conductance and the Lorentz number. We find that in the low temperature limit, the Lorentz…
A theory of thermal transport in a two-channel Kondo system, such as the one formed by a small quantum dot coupled to two leads and to a larger dot, is formulated. The interplay of the two screening constants allows an exploration of the Fermi liquid and non-Fermi liquid regimes. By using analytical, as well as numerical renormalization group methods, we study the temperature dependence of the thermal conductance and the Lorentz number. We find that in the low temperature limit, the Lorentz number attains its universal value, irrespective of the nature of the ground state.
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Quantum phase transition in a gapped Anderson model: A numerical renormalization group study
Phys. Rev. B 81, 235106 (2010)
We use the numerical renormalization group method to investigate the spectral properties of a single-impurity Anderson model with a gap {\delta} across the Fermi level in the conduction-electron spectrum. For any finite {\delta} > 0, at half filling the ground state of the system is always a doublet. Away from half filling a quantum phase transition (QPT) occurs as function of the gap value {\delta}, and the system evolves from the strong-coupling (SC) Kondo-type state, corresponding to…
We use the numerical renormalization group method to investigate the spectral properties of a single-impurity Anderson model with a gap {\delta} across the Fermi level in the conduction-electron spectrum. For any finite {\delta} > 0, at half filling the ground state of the system is always a doublet. Away from half filling a quantum phase transition (QPT) occurs as function of the gap value {\delta}, and the system evolves from the strong-coupling (SC) Kondo-type state, corresponding to {\delta} <{\delta}_C toward a localized moment (LM) regime for {\delta} > {\delta}_C. The opening of the gap leads to the formation of one (two) bound states when the system is in the SC (LM) regime. The evolution across the QPT of their positions and the corresponding weights together with the dynamic properties of the model are investigated.
Limbi cunoscute
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English
Competență profesională completă
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Romanian
Competență de vorbitor nativ sau bilingv
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French
Competență elementară
Mai multe activități de Adrian Roman
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A new cold fusion claim was made by the Indian company HYLENR. I had a look -- and I have some comments. https://lnkd.in/eT7RGzDp
A new cold fusion claim was made by the Indian company HYLENR. I had a look -- and I have some comments. https://lnkd.in/eT7RGzDp
Apreciat de Adrian Roman
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Quantum research pioneer John Preskill talks to CERN about the early days of quantum information science -- and where it's…
Quantum research pioneer John Preskill talks to CERN about the early days of quantum information science -- and where it's…
Apreciat de Adrian Roman
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Albert Einstein presented his dissertation #OnThisDay in 1905 at the University of Zurich. Shortly after, he published four papers that presented…
Albert Einstein presented his dissertation #OnThisDay in 1905 at the University of Zurich. Shortly after, he published four papers that presented…
Apreciat de Adrian Roman
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In 2018, the world agreed to redefine the kilogram. Instead of being pegged to the mass of a physical object in a vault in France, the kilogram is…
In 2018, the world agreed to redefine the kilogram. Instead of being pegged to the mass of a physical object in a vault in France, the kilogram is…
Apreciat de Adrian Roman
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Danish molten salt reactor developer copenhagen atomics and Switzerland’s Paul Scherrer Institute have signed a collaboration agreement for a thorium…
Danish molten salt reactor developer copenhagen atomics and Switzerland’s Paul Scherrer Institute have signed a collaboration agreement for a thorium…
Apreciat de Adrian Roman
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Wishing Donald Trump good health after an assassination attempt is not a partisan statement, it's a human statement. I'm getting really tired of…
Wishing Donald Trump good health after an assassination attempt is not a partisan statement, it's a human statement. I'm getting really tired of…
Apreciat de Adrian Roman
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Argonne National Laboratory's Advanced Photon Source has been upgraded, a project in the making since 2010! The facility uses bright X-rays to see…
Argonne National Laboratory's Advanced Photon Source has been upgraded, a project in the making since 2010! The facility uses bright X-rays to see…
Apreciat de Adrian Roman
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A version of Llama-3, fine-tuned for tool use/function calling on synthetic data from Groq. Beats all the proprietary models on the BFCL…
A version of Llama-3, fine-tuned for tool use/function calling on synthetic data from Groq. Beats all the proprietary models on the BFCL…
Apreciat de Adrian Roman
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