[
    {
        "id": "https://authors.library.caltech.edu/records/h2hbk-2bm48",
        "eprint_status": "archive",
        "datestamp": "2026-03-24 18:27:45",
        "lastmod": "2026-03-28 03:48:52",
        "type": "conference_item",
        "metadata_visibility": "show",
        "creators": {
            "items": [
                {
                    "id": "Gabritchidze-Bekari",
                    "name": {
                        "family": "Gabritchidze",
                        "given": "Bekari"
                    },
                    "orcid": "0000-0001-6392-0523"
                },
                {
                    "id": "Cleary-K-A",
                    "name": {
                        "family": "Cleary",
                        "given": "Kieran"
                    },
                    "orcid": "0000-0002-8214-8265"
                },
                {
                    "id": "Kooi-Jacob",
                    "name": {
                        "family": "Kooi",
                        "given": "Jacob"
                    },
                    "orcid": "0000-0002-6610-0384"
                },
                {
                    "id": "Esho-Iretomiwa",
                    "name": {
                        "family": "Esho",
                        "given": "Iretomiwa"
                    },
                    "orcid": "0000-0002-3746-6571"
                },
                {
                    "id": "Readhead-A-C-S",
                    "name": {
                        "family": "Readhead",
                        "given": "Anthony C."
                    },
                    "orcid": "0000-0001-9152-961X"
                },
                {
                    "id": "Minnich-A-J",
                    "name": {
                        "family": "Minnich",
                        "given": "Austin J."
                    },
                    "orcid": "0000-0002-9671-9540"
                }
            ]
        },
        "title": "Experimental Characterization of Temperature-Dependent Microwave Noise of Discrete HEMTs: Drain Noise and Real-Space Transfer",
        "ispublished": "pub",
        "full_text_status": "public",
        "keywords": "HEMTs; microwave measurements; cryogenics; low-noise amplifiers; drain temperature; real-space transfer",
        "note": "<p>&copy; 2022 IEEE.</p>\n\n<p>The authors thank Sander Weinreb, Pekka Kangaslahti,&nbsp;James Lamb, Shi Jun, Junjie Li and Jan Grahn for useful<br>discussions.</p>\n\n<p>This work was supported by the National Science Foundation under Grant No. 1911220.</p>",
        "abstract": "<p>We report wafer characterization of the S-parameters and microwave noise temperature of discrete GaAs and GaN HEMTs over a temperature range of 20 - 300 K. The measured noise temperature (T50) exhibits a dependence on physical temperature that is inconsistent with a constant drain temperature, with Td for the GaAs and GaN devices changing from ~ 2000 K and ~2800 K at room temperature to ~ 700 K and ~ 1800 K at cryogenic temperatures, respectively. The observed temperature dependence is qualitatively consistent with that predicted from a theory of drain noise based on real-space transfer of electrons from the channel to the barrier.</p>",
        "date": "2022-06-19",
        "date_type": "published",
        "publication": "2022 IEEE/MTT-S International Microwave Symposium - IMS 2022",
        "publisher": "IEEE",
        "pagerange": "615-618",
        "isbn": "978-1-6654-9613-1",
        "official_url": "https://authors.library.caltech.edu/records/h2hbk-2bm48",
        "funders": {
            "items": [
                {
                    "grant_number": "1911220"
                }
            ]
        },
        "local_group": {
            "items": [
                {
                    "id": "Owens-Valley-Radio-Observatory"
                },
                {
                    "id": "Division-of-Physics-Mathematics-and-Astronomy"
                },
                {
                    "id": "Physics-Department"
                },
                {
                    "id": "Astronomy-Department"
                },
                {
                    "id": "Division-of-Engineering-and-Applied-Science"
                },
                {
                    "id": "Kavli-Nanoscience-Institute"
                }
            ]
        },
        "doi": "10.1109/ims37962.2022.9865505",
        "pub_year": "2022",
        "author_list": "Gabritchidze, Bekari; Cleary, Kieran; et al."
    }
]