Zobrazeno 1 - 10
of 231
pro vyhledávání: '"Majumdar, Pinaki"'
In a Mott insulator, a laser pulse with frequency tuned to the gap scale can create a holon-doublon plasma, suppressing the magnetic moment ${\vec m}_i$ and destroying magnetic order. While this disruptive effect is well established experimentally on
Externí odkaz:
http://arxiv.org/abs/2409.05555
Recent experiments on nanoclusters of silver (Ag) embedded in a gold (Au) matrix reveal a huge increase in both the zero temperature resistivity and the coefficient of the ``$T$ linear'' thermal resistivity with increasing volume fraction of Ag. A fr
Externí odkaz:
http://arxiv.org/abs/2408.12542
Autor:
Mondal, Tanmoy, Majumdar, Pinaki
For several decades the low carrier density local moment magnet EuB$_6$ has been considered a candidate material for ferromagnetic polarons. There is however no consistent explanation for the host of intriguing observations that have accrued over the
Externí odkaz:
http://arxiv.org/abs/2408.03628
Pump-probe response of the spin-orbit coupled Mott insulator Sr$_2$IrO$_4$ reveals a rapid creation of low energy optical weight and suppression of three dimensional magnetic order on laser pumping. Post pump there is a quick reduction of the optical
Externí odkaz:
http://arxiv.org/abs/2407.00558
An electron-phonon system at commensurate filling often displays charge order (CO) in the ground state. Such a system subject to a laser pulse shows a wide variety of behaviour. A weak pulse sets up low amplitude oscillations in the order parameter,
Externí odkaz:
http://arxiv.org/abs/2205.14710
Publikováno v:
Phys. ReV. B 105, 054501 (2022)
We show conclusively that a pseudogap state can arise at $T > T_c$, for reasonable pairing interaction strength, from order parameter fluctuations in a two dimensional minimal model of $d$-wave superconductivity. The occurrence of the pseudogap requi
Externí odkaz:
http://arxiv.org/abs/2112.10965
Autor:
Dutta, Arijit, Majumdar, Pinaki
Publikováno v:
Phys. Rev. B 105, 075149 (2022)
We establish the nonequilibrium thermal phases of a voltage driven antiferromagnetic Mott insulator in three dimensions, realised at steady state under a voltage bias. Starting from the Keldysh action for the half filled Hubbard model we derive an ef
Externí odkaz:
http://arxiv.org/abs/2009.04533
Autor:
Bhattacharyya, Sauri, Majumdar, Pinaki
Publikováno v:
Phys. Rev. B 104, 235124 (2021)
We study the equilibrium dynamics of magnetic moments in the Mott insulating phase of the Hubbard model on the square and triangular lattice. We rewrite the Hubbard interaction in terms of an auxiliary vector field and use a recently developed Langev
Externí odkaz:
http://arxiv.org/abs/2009.01833
Publikováno v:
Phys. Rev. B 101, 125130 (2020)
We solve for the finite temperature collective mode dynamics in the Holstein-double exchange problem, using coupled Langevin equations for the phonon and spin variables. We present results in a strongly anharmonic regime, close to a polaronic instabi
Externí odkaz:
http://arxiv.org/abs/1912.07810
Publikováno v:
Phys. Rev. B 99, 165150 (2019)
We use a Langevin approach to treat the finite temperature dynamics of displacement variables in the half-filled spinless Holstein model. Working in the adiabatic regime we exploit the smallness of the adiabatic parameter to simplify the memory effec
Externí odkaz:
http://arxiv.org/abs/1902.01337