arXiv subjects

Pipat Harata

Publications and source records attributed to Pipat Harata.

3 recordsLinked to original sources

arXiv2025

Linear Response Conductance of Metallic Single Electron Pump

We calculate the linear-response conductance of a metallic single-electron pump using the path-integral Monte Carlo (PIMC) method. The Coulomb oscillations of the conductance are calculated to illustrate the influence of the Coulomb blockade effect on the system. Furthermore, the experimental conductance is compared with the calculated conductance of various gate voltage configurations and temperatures. The results are consistent even in the low-temperature regime, where significant quantum fluctuation occurs, and the semiclassical approximation fails. Consequently, the present investigation replicates the success of the PIMC approach while precisely describing the quantum fluctuation phenomena of single-electron devices.

cond-mat.mes-hall↗

arXiv2023

Calculating the Coulomb blockade phase diagram in the strong coupling regime of single-electron transistor: a quantum Monte Carlo study

We present a novel approach for calculating the Coulomb Blockade Phase Diagram (CBPD) in the experimentally accessible strong coupling regime of a single-electron transistor (SET). Our method utilizes the Path Integral Monte Carlo (PIMC) technique to accurately compute the Coulomb oscillation of the Differential Capacitance (DC). Furthermore, we investigate the impact of the gate voltage and temperature variations on the DC, thereby gaining insights into the system's behaviour. As a result, we propose a method to calculate the Coulomb Blockade Boundary Line (CBBL) and demonstrate its efficacy by setting the visibility parameter to $10\%$. The resulting boundary line effectively defines the transition between the Coulomb and non-Coulomb blockade regimes, thereby enabling the construction of a comprehensive CBPD.

cond-mat.mes-hall↗

arXiv2021

Grand canonical partition function of a serial metallic island system

We present a calculation of the grand canonical partition function of a serial metallic island system by the imaginary-time path integral formalism. To this purpose, all electronic excitations in the lead and island electrodes are described using Grassmann numbers. Coulomb charging energy of the system is represented in terms of phase fields conjugate to the island charges. By the large channel approximation, the tunneling action phase dependence can also be determined explicitly. Therefore, we represent the partition function as a path integral over phase fields with a path probability given in an analytically known effective action functional. Using the result, we also propose a calculation of the average electron number of the serial island system in terms of the expectation value of winding numbers. Finally, as an example, we describe the Coulomb blockade effect in the two-island system by the average electron number and propose a method to construct the quantum stability diagram.

cond-mat.mes-hall↗