[PDF]    http://dx.doi.org/10.3952/physics.v55i4.3232

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 55, 335–341 (2015)
HOT-PHONON-ASSISTED ADDITIONAL CORRELATION IN Al0.23Ga0.77N/GaN
Arvydas Matulionis, Vytautas Aninkevičius, and Mindaugas Ramonas
Semiconductor Physics Institute of Center for Physical Sciences and Technology, A. Goštauto 11, LT-01108 Vilnius, Lithuania
E-mail: arvydas.matulionis@ftmc.lt

Received 5 October 2015; revised 10 November 2015; accepted 15 December 2015

The hot-phonon effect is considered for an Al0.23Ga0.77N/GaN structure with a two-dimensional electron gas subjected to an electric field applied in the plane of electron confinement. The hot-phonon accumulation is taken into account in the hot-phonon lifetime approximation for the quantum well model designed through a self-consistent solution of Schrödinger and Poisson equations. The field-dependent electron temperature and non-ohmic transport are obtained from the Monte Carlo simulation for a 3-subband model. The longitudinal tensor component of an additional correlation of electron velocities is estimated in the hot-electron temperature approximation and an essential dependence on the hot-phonon lifetime is demonstrated. The results are in a reasonable agreement with the experimental data for a similar structure with a two-dimensional electron gas
Keywords: hot electrons, fluctuations, diffusion, hot phonons
PACS: 73.50.Fq, 73.50.Td, 73.61.Ey, 73.63.Hs

KARŠTŲJŲ FONONŲ PALAIKOMA PAPILDOMA KORELIACIJA Al0,23Ga0,77N/GaN DARINYJE
Arvydas Matulionis, Vytautas Aninkevičius, Mindaugas Ramonas
Fizinių ir tecnologijos mokslų centro Puslaidininkių fizikos institutas, Vilnius, Lietuva

Išnagrinėtas karštųjų fononų vaidmuo sukuriant papildomą elektronų greičių koreliaciją Al0,23Ga0,77N/GaN darinyje su dvimatėmis elektronų dujomis, veikiamomis stipriu elektriniu lauku, sudarytu dvimatės kvantinės protakos plokštumoje. Karštaisiais fononais įprasta vadinti išilginius optinius fononus, kuriuos išspinduliuoja karštieji elektronai taip atsikratydami savo perteklinės energijos. Kaupdamiesi dvimatėje protakoje, karštieji fononai trukdo elektronams judėti ir dalyvauja sukuriant papildomą koreliaciją. Šrėdingerio ir Puasono lygčių sistemos skaitmeninis sprendimas panaudotas sudarant juostų sandaros ir elektronų sklaidos modelį, kuris sprendžiamas Monte Karlo metodu. Papildomos koreliacijos tenzoriaus sandas elektrinio lauko kryptimi įvertinamas karštųjų elektronų temperatūros artinyje. Parodyta, kad ilgesnės karštųjų fononų pusėjimo trukmės lemia reikšmingesnę papildomą koreliaciją. Skaitmeninis įvertinimas neblogai dera su eksperimentiniais panašaus darinio tyrimo rezultatais.
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