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pro vyhledávání: '"Dasgupta, Subinay"'
Autor:
Nandi, Protyush, Dasgupta, Subinay
We study the properties of a spinless Hamiltonian which describes topological nodal line semimetals at zero temperature. Our Hamiltonian has some resemblance with the usual Hamiltonian for this type of materials, with that of Weyl semimetals and is s
Externí odkaz:
http://arxiv.org/abs/2308.06033
Publikováno v:
Phys. Rev. B 109, 064312 (2024)
The signature of quantum phase transition is generally wiped out at finite temperature. A few quantities that have been observed to carry this signature through a nonanalytic behavior are also limited to low temperatures only. With an aim to identify
Externí odkaz:
http://arxiv.org/abs/2302.01795
Publikováno v:
Phys. Rev. Lett. 128, 247201 (2022)
Quantum phase transitions occur when quantum fluctuation destroys order at zero temperature. With an increase in temperature, normally the thermal fluctuation wipes out any signs of this transition. Here we identify a physical quantity that shows non
Externí odkaz:
http://arxiv.org/abs/2111.11126
Publikováno v:
J. Phys. A: Math. Theor. 53 265002 (2020)
Dynamical phase transition in quantum many body systems is usually studied by taking it in the ground state and then quenching a parameter to a new value. We investigate here the dynamics when one performs the time evolution of a generic state and ob
Externí odkaz:
http://arxiv.org/abs/1912.00207
Autor:
Dasgupta, Subinay, Sinha, Sitabhra
Consider a bottleneck in a road through which only one car can pass through. Suppose that at a time the car passing will have the most aggressive driver in queue and that the aggressiveness of an individual is measured by an attribute $A \equiv N \ta
Externí odkaz:
http://arxiv.org/abs/1804.10965
Publikováno v:
Eur. Phys. J. B (2017) 90: 140
We study the dynamics caused by transport of transverse magnetization in one dimensional transverse Ising chain at zero temperature. We observe that a class of initial states having product structure in fermionic momentum-space and satisfying certain
Externí odkaz:
http://arxiv.org/abs/1612.04066
Akademický článek
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Autor:
Dhar, Shrabanti, Dasgupta, Subinay
Publikováno v:
Phys. Rev. A 93, 050103 (2016)
Suppose a quantum system starts to evolve under a Hamiltonian from some initial state. When for the first time, will an observable attain a preassigned value? To answer this question, one method often adopted is to make instantaneous measurements per
Externí odkaz:
http://arxiv.org/abs/1603.03561
Autor:
Dasgupta, Subinay
Publikováno v:
In Physica A: Statistical Mechanics and its Applications 15 July 2021 574
Publikováno v:
Physical Review A 91, 062115 (2015)
We consider a quantum particle, moving on a lattice with a tight-binding Hamiltonian, which is subjected to measurements to detect it's arrival at a particular chosen set of sites. The projective measurements are made at regular time intervals $\tau$
Externí odkaz:
http://arxiv.org/abs/1410.8701