Subgap dynamics of double quantum dot coupled between superconducting and normal leads

Abstract

Dynamical processes induced by the external time-dependent fields can provide valuable insight into the characteristic energy scales of a given physical system. We investigate them here in a nanoscopic heterostructure, consisting of the double quantum dot coupled in series to the superconducting and the metallic reservoirs, analyzing its response to (i) abrupt bias voltage applied across the junction, (ii) sudden change of the energy levels, and imposed by (iii) their periodic driving. We explore subgap properties of this setup which are strictly related to the in-gap quasiparticles and discuss their signatures manifested in the time-dependent charge currents. The characteristic multi-mode oscillations, their beating patters and photon-assisted harmonics reveal a rich spectrum of dynamical features that might be important for designing the superconducting qubits.

Artificial intelligence methods for applied superconductivity: material, design, manufacturing, testing, operation, and condition monitoring

“…The value of zero-biased conductance is calculated by solving differential equations and ML is helpful for such problems. By applying this method, high accuracy of conductance prediction (around 98.7%) was obtained [322].…”

Spin Dynamics in Magnetic Nano-Junctions

“…Among them are the problems of spin relaxation [4][5][6][7][8][9][10][11][12], inertial dynamics [13][14][15][16][17], externally driven magnetization dynamics [16,[18][19][20][21][22][23][24][25][26][27][28][29][30] and previously unrecognized torques [31][32][33][34]. These studies are often directly applicable to the investigation of dynamical properties of single-molecule magnets [35][36][37], magnetic impurities embedded in metallic hosts [35,[38][39][40][41][42][43] or even larger ferromagnetic systems whose dynamics can be represented by a single macrospin [18,44,45]. Nevertheless, no-less important is the insight that they provide into the dynamics of more complex magnetic structures [15,16...…”

Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions

“…These include issues such as spin relaxation [4][5][6][7][8][9][10][11][12], inertial dynamics [13][14][15][16][17], spin fluctuations [18][19][20][21][22], externally driven magnetization dynamics [16,[23][24][25][26][27][28][29][30][31][32][33][34][35], and previously unrecognized torques [36][37][38][39]. These studies are often directly applicable to the investigation of dynamical properties of single-molecule magnets [40][41][42], magnetic impurities embedded in metallic hosts [40,[43][44][45][46][47][48], or even larger ferromagnetic systems whose dynamics can be represented by a single macrospin [23,…”