TY - JOUR

T1 - Enhanced e–e interaction in suspended 2DEG evidenced by transverse magnetic focusing

AU - Egorov, Dmitry A.

AU - Pokhabov, Dmitriy A.

AU - Zhdanov, Evgeny Yu.

AU - Shevyrin, Andrey A.

AU - Bakarov, Askhat K.

AU - Pogosov, Arthur G.

N1 - This work is supported by the Russian Science Foundation (Grant No. 22-12-00343\u2014experimental study) and the Ministry of Science and Higher Education of the Russian Federation (Project FWGW-2022-0011\u2014initial heterostructures characterization).

PY - 2024/9/9

Y1 - 2024/9/9

N2 - The features of electron-electron (e-e) interaction in a two-dimensional electron gas (2DEG) in GaAs/AlGaAs heterostructures, including the case of structures detached from the substrate in which this interaction is enhanced, are experimentally studied using transverse magnetic focusing over a wide temperature range. The measurements reveal pronounced resonant ballistic magnetoresistance peaks that are suppressed with increasing temperature and satisfy the condition of magnetic focusing. This suppression is caused by e-e scattering, which gets stronger with increasing temperature. Analysis of the temperature suppression of ballistic peaks allowed us to determine the temperature dependence of the e-e scattering length as well as the effective dielectric constants, which are 12 and 8 in the non-suspended and suspended cases, respectively. The significant decrease in effective dielectric constant in the suspended sample clearly indicates the enhancement of e-e interaction as a result of suspension.

AB - The features of electron-electron (e-e) interaction in a two-dimensional electron gas (2DEG) in GaAs/AlGaAs heterostructures, including the case of structures detached from the substrate in which this interaction is enhanced, are experimentally studied using transverse magnetic focusing over a wide temperature range. The measurements reveal pronounced resonant ballistic magnetoresistance peaks that are suppressed with increasing temperature and satisfy the condition of magnetic focusing. This suppression is caused by e-e scattering, which gets stronger with increasing temperature. Analysis of the temperature suppression of ballistic peaks allowed us to determine the temperature dependence of the e-e scattering length as well as the effective dielectric constants, which are 12 and 8 in the non-suspended and suspended cases, respectively. The significant decrease in effective dielectric constant in the suspended sample clearly indicates the enhancement of e-e interaction as a result of suspension.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85203808513&origin=inward&txGid=dca556947866c24016e2ea67a38c3b99

U2 - 10.1063/5.0230437

DO - 10.1063/5.0230437

M3 - Article

VL - 125

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 11

M1 - 112103

ER -